Pavel Karen

Norwegian version of this page
Email
pavel.karen@kjemi.uio.no
Room
ØU 82
Username
Visiting address
Sem Sælands vei 26
Kjemibygningen
0371 Oslo
Postal address
Postboks 1033 Blindern
0315 Oslo
Academic interests
- Inorganic chemistry and crystallography.
- Metal oxides with fractional valences.
- Less common combinations of properties: towards halfmetallic ferromagnet.
- Relationship between structure and phase transitions into valence-controlled states: temperatures of valence mixing, of superconductivity.
- Less common compositions: carbides-oxides as pseudonitrides, nitrides-fluorides as pseudooxides.
- Oxide materials with less-common properties: high conductivity, photocatalysis.
Academic interests, methods
- Syntheses of new compounds at less-common temperature- and redox conditions.
- Precise valence control in solid oxides of transition metals.
- Structure determination from synchrotron x-ray and neutron diffraction data.
- Mössbauer spectroscopy of valence-, spin-, and coordination states (in collaboration).
- Magnetic, electric and thermal properties of inorganic solids (in collaboration).
Teaching
- KJM-MENA5110/9110 - Inorganic Structural Chemistry
- KJM-MENA5130/9130 - Nonstoichiometry and phase relations of inorganic solids
Background
- Positions related to University of Oslo: Professor, lecturer, researcher.
- Earlier positions: lecturer, University of Chemical Technology, Prague.
Awards
- Textbook of the year, 1987 (University of Chemical Technology, Prague)
- First place in national Chemistry Olympiad in Prague, 1966
Scientific service
- IUPAC, associated member in Division II, Inorganic Chemistry
- IUPAC, member of the Interdivisional Committee on Terminology, Nomenclature and Symbols
- International Centre for Diffraction Data, a member
- Norwegian Chemical Society, member of nomenclature committee
Collaboration
An extensive collaboration in Finland and USA
Projects
IUPAC project Toward a Comprehensive Definition of Oxidation State
IUPAC project Toward a Comprehensive Definition of Valence
Publications
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Karen, Pavel (2022). Structural changes and valence-mixing transition in EuBaCo2O5. Journal of Solid State Chemistry. ISSN 0022-4596. 314. doi: 10.1016/j.jssc.2022.123367. Full text in Research Archive
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Karen, Pavel (2022). Thermal evolution of the EuBaCo2O5.5 crystal structure. Journal of Solid State Chemistry. ISSN 0022-4596. 311. doi: 10.1016/j.jssc.2022.123102. Full text in Research Archive
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Karen, Pavel (2022). Defect chemistry and oxygen nonstoichiometry of CeBaFe2O5.5. Journal of Solid State Chemistry. ISSN 0022-4596. 307. doi: 10.1016/j.jssc.2021.122743. Full text in Research Archive
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Karen, Pavel (2021). The challenge to establish a definition. Chemistry International. ISSN 0193-6484. 43(3), p. 38–39. doi: 10.1515/ci-2021-0316.
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Lindroos, F.; Slotte, J.M.K.; Lindén, J.; Chumakov, A.I. & Karen, Pavel (2021). Suppression of the nuclear forward scattering signal in GdBaFe2O5 and PrBaFe2O5. Physics Letters A. ISSN 0375-9601. 416. doi: 10.1016/j.physleta.2021.127652. Full text in Research Archive
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Karen, Pavel (2021). Oxygen nonstoichiometry in LnBaFe2O5+w across Ln = Nd, Sm, Gd . Journal of Solid State Chemistry. ISSN 0022-4596. 301. doi: 10.1016/j.jssc.2021.122297. Full text in Research Archive
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Karen, Pavel (2021). Synthesis and equilibrium oxygen nonstoichiometry of PrBaFe2O5+w. Journal of Solid State Chemistry. ISSN 0022-4596. 299, p. 1–8. doi: 10.1016/j.jssc.2021.122147. Full text in Research Archive
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Linden, J; Lindroos, F. & Karen, Pavel (2017). Orbital occupancy evolution across spin- and charge-ordering transitions in YBaFe2O5. Journal of Solid State Chemistry. ISSN 0022-4596. 252, p. 119–128. doi: 10.1016/j.jssc.2017.04.036. Full text in Research Archive
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Karen, Pavel; McArdle, Patrick & Takats, Josef (2016). Comprehensive definition of oxidation state (IUPAC Recommendations 2016). Pure and Applied Chemistry. ISSN 0033-4545. 88, p. 831–839. doi: 10.1515/pac-2015-1204. Full text in Research Archive
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Görbitz, Carl Henrik; Karen, Pavel; Dusek, Michal & Petricek, Vaclav (2016). An exceptional series of phase transitions in hydrophobic amino acids with linear side chains. IUCrJ. ISSN 2052-2525. 3, p. 341–353. doi: 10.1107/S2052252516010472.
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Karen, Pavel (2015). Oxidation state, a long-standing issue! Angewandte Chemie International Edition. ISSN 1433-7851. 54(16), p. 4716–4726. doi: 10.1002/anie.201407561.
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Gorbitz, Carl Henrik & Karen, Pavel (2015). Twin displacive phase transitions in amino acid quasiracemates. Journal of Physical Chemistry B. ISSN 1520-6106. 119(15), p. 4975–4984. doi: 10.1021/acs.jpcb.5b01483.
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Karen, Pavel; McArdle, Patrick & Takats, Josef (2014). Toward a comprehensive definition of oxidation state (IUPAC Technical Report). Pure and Applied Chemistry. ISSN 0033-4545. 86(6), p. 1017–1081. doi: 10.1515/pac-2013-0505.
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Jantsky, Laurent; Okamoto, Hiroshi; Thomas, Michael; Karen, Pavel; Hauback, Bjørn & Rosseinsky, Matthew J [Show all 7 contributors for this article] (2014). Complex Magnetic Behavior in the PrSr3(Fe1–xCox)3O10−δ n = 3 Ruddlesden–Popper-Type Solid Solution with High Valent Cobalt and Iron. Chemistry of Materials. ISSN 0897-4756. 26(2), p. 886–897. doi: 10.1021/cm400394c.
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Lindén, Johan; Lindroos, F. & Karen, Pavel (2014). Iron orbital occupancies upon valence mixing of charge-ordered GdBaFeIIFeIIIO5. Hyperfine Interactions. ISSN 0304-3843. 226(1-3), p. 329–339. doi: 10.1007/s10751-013-0973-8.
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Olsen, Jørn Eirik; Karen, Pavel; Sørby, Magnus Helgerud & Hauback, Bjørn (2014). Effect of chloride substitution on the order-disorder transition in NaBH4 and (NaBD4)-B-11. Journal of Alloys and Compounds. ISSN 0925-8388. 587, p. 374–379. doi: 10.1016/j.jallcom.2013.10.171. Full text in Research Archive
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Lindén, J. & Karen, Pavel (2012). Modeling hyperfine parameters observed from the charge-ordered to valence-mixed state of NdBaFe2O5. Journal of Physics: Condensed Matter. ISSN 0953-8984. 24(37). doi: 10.1088/0953-8984/24/37/376002.
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Linden, J & Karen, Pavel (2010). NdBaFe2O5+w and steric effect of Nd on valence mixing and ordering of Fe. Journal of Solid State Chemistry. ISSN 0022-4596. 183(11), p. 2703–2713. doi: 10.1016/j.jssc.2010.09.012.
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Andersson, K. Kristoffer & Karen, Pavel (2009). Mössbauer Spectroscopy in the Nordic countries; University of Oslo. Mössbauer Effect Reference and Data Journal. ISSN 0163-9587. 32(1), p. 34–36. Show summary
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Seibel, HA; Karen, Pavel; Wagner, TR & Woodward, PM (2009). Synthesis and characterization of color variants of nitrogen- and fluorine-substituted TiO2. Journal of Materials Chemistry. ISSN 0959-9428. 19(4), p. 471–477. doi: 10.1039/b815758h.
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Woodward, PM; Goldberger, J; Stoltzfus, MW; Eng, HW; Ricciardo, RA & Santhosh, PN [Show all 8 contributors for this article] (2008). Electronic, magnetic, and structural properties of Sr2MnRuO6 and LaSrMnRuO6 double perovskites. Journal of The American Ceramic Society. ISSN 0002-7820. 91, p. 1796–1806. doi: 10.1111/j.1551-2916.2008.02412.x.
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Karen, Pavel; Gustafsson, K & Linden, J (2007). EuBaFe2O5: Extent of charge ordering by Mossbauer spectroscopy and high-intensity high-resolution powder diffraction. Journal of Solid State Chemistry. ISSN 0022-4596. 180. doi: 10.1016/j.jssc.2006.09.021.
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Chang, S; Karen, Pavel; Hehlen, MP; Trouw, FR & McQueeney, RJ (2007). Damping of antiferromagnetic spin waves by valence fluctuations in the double layer perovskite YBaFe2O5. Physical Review Letters. ISSN 0031-9007. 99. doi: 10.1103/PhysRevLett.99.037202.
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Karen, Pavel; Gustafsson, K & Linden, J (2007). EuBaFe2O5+w: Valence mixing and charge ordering are two separate cooperative phenomena. Journal of Solid State Chemistry. ISSN 0022-4596. 180, p. 148–157. doi: 10.1016/j.jssc.2006.09.031.
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Karen, Pavel (2006). Nonstoichiometry in oxides and its control. Journal of Solid State Chemistry. ISSN 0022-4596. 179, p. 3167–3183. doi: 10.1016/j.jssc.2006.06.012.
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Karen, Pavel; Moodenbaugh, AR; Goldberger, J; Santhosh, PN & Woodward, PM (2006). Electronic, magnetic and structural properties of A(2)VMoO(6) perovskites (A = Ca, Sr). Journal of Solid State Chemistry. ISSN 0022-4596. 179. doi: 10.1016/j.jssc.2006.04.013.
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Linden, J; Karen, Pavel; Nakamura, J; Karppinen, M & Yamauchi, H (2006). Transport and magnetotransport properties across the two-step Verwey transition in BaGdFe2O5+w. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 73. doi: 10.1103/PhysRevB.73.064415. Full text in Research Archive
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Karen, Pavel; Suard, Emmanuelle & Fauth, Francois (2005). Crystal Structure of Stoichiometric YBa2Fe3O8. Inorganic Chemistry. ISSN 0020-1669. 44, p. 8170–8172. doi: 10.1021/ic048746b.
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Karen, Pavel (2004). Chemistry and thermodynamics of the twin charge-ordering transitions in RBaFe2O5+w series. Journal of Solid State Chemistry. ISSN 0022-4596. 177, p. 281–292. doi: 10.1016/j.jssc.2003.08.011.
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Lindén, Johan; Karen, Pavel; Yamauchi, Hisao & Karppinen, Maarit (2004). Valence mixing, separation and ordering in double-cell perovskite GdBaFe2O5+w. Journal of Magnetism and Magnetic Materials. ISSN 0304-8853. 272-276, p. E267–E268. doi: 10.1016/j.jmmm.2003.11.181.
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Lindén, Johan; Karen, Pavel; Yamauchi, Hisao & Karppinen, Maarit (2004). Exploring the Verwey-Type Transition in GdBaFe2O5+w Using 57Fe Moessbauer Spectroscopy. Hyperfine Interactions. ISSN 0304-3843. 156/157(1-4), p. 321–325. doi: 10.1023/B%3AHYPE.0000043248.99004.65.
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Karen, Pavel; Suard, Emmanuelle; Fauth, Francois & Woodward, Patrick M. (2004). YBaMnCoO5; neither valence mixed nor charge ordered. Solid State Sciences. ISSN 1293-2558. 6(11), p. 1195–1204. doi: 10.1016/j.solidstatesciences.2004.06.010.
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Moritomo, Y; Hanawa, M; Xu, S; Ishikawa, H; Ohishi, Y & Kato, K [Show all 10 contributors for this article] (2004). Pressure effects on the charge-ordering transition of BaYCo2O5.0. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 69, p. art. no.–134118. doi: 10.1103/PhysRevB.69.134118. Full text in Research Archive
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Nakamura, J; Karppinen, M; Karen, Pavel; Linden, J & Yamauchi, H (2004). Isovalent-substitution effect on the Verwey-type transition in the A-site-ordered double perovskite (Ba,Sr)RFe2O5. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 70. doi: 10.1103/PhysRevB.70.144104. Full text in Research Archive
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Karen, Pavel; Kjekshus, Arne; Huang, Q.; Karen, V. L.; Lynn, J. W. & Rosov, N. [Show all 8 contributors for this article] (2003). Neutron powder diffraction study of nuclear and magnetic structures of oxidized and reduced YBa2Fe3O8+w. Journal of Solid State Chemistry. ISSN 0022-4596. 174, p. 87–95. doi: 10.1016/S0022-4596%2803%2900180-4.
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Huang, Q. Z.; Karen, V. L.; Santoro, A.; Kjekshus, Arne; Lindén, Johan & Pietari, T. [Show all 7 contributors for this article] (2003). Substitution of Co3+ in YBa2Fe3O8. Journal of Solid State Chemistry. ISSN 0022-4596. 172, p. 73–80. doi: 10.1016/S0022-4596%2802%2900122-6.
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Woodward, Patrick M. & Karen, Pavel (2003). Mixed valence in YBaFe2O5. Inorganic Chemistry. ISSN 0020-1669. 42(4), p. 1121–1129. doi: 10.1021/ic026022z.
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Woodward, Patrick M.; Suard, Emmanuelle & Karen, Pavel (2003). Structural tuning of charge, orbital, and spin ordering in double-cell perovskite series between NdBaFe2O5 and HoBaFe2O5. Journal of the American Chemical Society. ISSN 0002-7863. 125, p. 8889–8899. doi: 10.1021/ja034813.
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Karen, Pavel (2003). Effects of oxygen nonstoichiometry and of its distribution on Verwey-type transitions and structure of GdBaFe2O5+w. Journal of Solid State Chemistry. ISSN 0022-4596. 170, p. 9–23. doi: 10.1016/S0022-4596%2802%2900008-7.
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Karen, Pavel; Woodward, Patrick M.; Santhosh, P.N.; Vogt, Tom; Stephens, P.W. & Pagola, S. (2002). Verwey transition under oxygen loading in RBaFe2O5+w (R = Nd and Sm). Journal of Solid State Chemistry. ISSN 0022-4596. 167, p. 480–493. doi: 10.1006/jssc.2002.9665. Show summary
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Karen, Pavel; Woodward, Patrick M.; Lindén, Johan; Vogt, Tom; Studer, Andrew & Fischer, Peter (2001). Verwey transition in mixed-valence TbBaFe2O5: Two attempts to order charges. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 64(21), p. 214405/1–/14. doi: 10.1103/PhysRevB.64.214405. Full text in Research Archive
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Karen, Pavel; Kjekshus, Arne; Huang, Q.; Karen, V. L.; Mighell, A. D. & Santoro, A. (2000). Neutron powder diffraction study of the crystal structure of the oxycarbonate phase YBa2Cu2.85(CO3)0.15O6.73. Physica. C, Superconductivity. ISSN 0921-4534. 336, p. 279–286. doi: 10.1016/S0921-4534%2800%2900275-6.
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Vogt, Tom; Woodward, Patrick M.; Karen, Pavel; Hunter, B.A.; Henning, P. & Moodenbaugh, A.R. (2000). Low to High Spin-State Transition Induced by Charge Ordering in Antiferrimagnetic YBaCo2O5. Physical Review Letters. ISSN 0031-9007. 84(13), p. 2969–2972. doi: 10.1103/PhysRevLett.84.2969. Full text in Research Archive
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Karen, Pavel & Kjekshus, Arne (2000). Phase Diagrams and Thermodynamic Properties. In Gschneidner, Karl A. Jr.; Eyring, LeRoy & Maple, Brian M. (Ed.), Handbook on the Physics and Chemistry of the Rare Earths. Volume 30, High-Temperature Superconductors - I. Elsevier Science B.V., The Netherlands. ISSN 0-444-50528-8. p. 229–373. doi: 10.1016/S0168-1273%2800%2930007-1.
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Karen, Pavel; Kjekshus, Arne; Huang, Q. & Karen, V. L. (1999). The Crystal Structure of Magnesium Dicarbide. Journal of Alloys and Compounds. ISSN 0925-8388. 282, p. 72–75. doi: 10.1016/S0925-8388%2898%2900828-7. Show summary
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Karen, Pavel & Woodward, Patrick M. (1999). Synthesis and Structural Investigations of the Double Perovskites REBaFe<SUB>2</SUB>O<SUB>5+w</SUB> (RE = Nd, Sm). Journal of Materials Chemistry. ISSN 0959-9428. 9, p. 789–797. doi: 10.1039/A809302D.
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Lindén, Johan; Karen, Pavel; Kjekshus, Arne; Miettinen, J.; Pietari, T. & Karppinen, Maarit (1999). Valence State Mixing and Separation in SmBaFe2O5+w. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 60(22), p. 15251–15260. doi: 10.1103/PhysRevB.60.15251. Full text in Research Archive
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Lindén, Johan; Karen, Pavel; Kjekshus, Arne; Miettinen, J. & Karppinen, Maarit (1999). Partial Oxygen Ordering in Cubic Perovskite REBa2Fe3O8+w (RE= Gd, Eu, Sm, Nd). Journal of Solid State Chemistry. ISSN 0022-4596. 144, p. 398–404. doi: 10.1006/jssc.1999.8178.
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Karen, Pavel & Norby, Truls Eivind (1998). La1−xBaxCr1−yTiyO3 with varied oxygen content. Journal of the Electrochemical Society. ISSN 0013-4651. 145, p. 264–269. doi: 10.1149/1.1838245.
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Karen, Pavel; Kjekshus, Arne; Huang, Q; Lynn, J.W.; Rosov, N. & Natali-Sora, I. [Show all 9 contributors for this article] (1998). Neutron and X-ray powder diffraction study of REBa2Fe3O8+w phases. Journal of Solid State Chemistry. ISSN 0022-4596. 136, p. 21–33. doi: 10.1006/jssc.1997.7636.
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Lindén, Johan; Lippmaa, Mikk; Kjekshus, Arne; Karen, Pavel & Karppinen, Maarit (1998). A 57Fe Mössbauer study of the cubic perovskite-type phase LaBa2Fe3O8+w (−0.20 < w < 0.83). Journal of Solid State Chemistry. ISSN 0022-4596. p. 87–97. doi: 10.1006/jssc.1998.7757.
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Karen, Pavel; Harlow, R.L.; Li, Z.; Meenan, P & Parziale, P.A. (1998). The crystal structure of 2-amino-4,6-dihydroxypyrimidine determined from powder X-ray synchrotron diffraction. Acta Chemica Scandinavica. ISSN 0904-213X. 52, p. 1051–1055. doi: 10.3891/acta.chem.scand.52-1051.
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Linden, Johan; Kjekshus, Arne; Karen, Pavel; Miettinen, J. & Karppinen, Maarit (1998). A 57Fe Mössbauer study of REBa2Fe3O8+w triple perovskites with varied oxygen content (RE = Dy, Er and Y). Journal of Solid State Chemistry. ISSN 0022-4596. 139, p. 168–175. doi: 10.1006/jssc.1998.7828.
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Karen, Pavel & Woodward, Patrick M. (1998). Liquid-mix disorder in crystalline solids; ScMnO3. Journal of Solid State Chemistry. ISSN 0022-4596. 141, p. 78–88. doi: 10.1006/jssc.1998.7918.
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Woodward, Patrick M.; Vogt, Tom; Cox, D. E.; Arulraj, A.; Rao, C.N.R. & Karen, Pavel [Show all 7 contributors for this article] (1998). The infuence of cation size on the structural features of Ln1/2A1/2MnO3 perovskites at room temperature. Chemistry of Materials. ISSN 0897-4756. 10, p. 3652–3665. doi: 10.1021/cm980397u.
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Karen, Pavel & Kjekshus, Arne (1997). Chemical phase diagrams in the YBa2Cu3O7 family, ANNO 1996. Journal of Thermal Analysis and Calorimetry. ISSN 1388-6150. 48, p. 1143–1227. doi: 10.1007/BF01979159.
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Natali-Sora, I.; Huang, Q.; Lynn, J.W.; Rosov, N.; Karen, Pavel & Kjekshus, Arne [Show all 9 contributors for this article] (1994). Neutron-powder-diffraction study of the nuclear and magnetic structures of the substitution compound (Y1−xCax)Ba2Fe3O8+d (x = 0.05, 0.10 and 0.20). Physical review B (PRB). ISSN 2469-9950. 49, p. 3465–3472. doi: 10.1103/PhysRevB.49.3465. Full text in Research Archive
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Huang, Q; Karen, Pavel; Karen, V.L.; Kjekshus, Arne; Lynn, J.W. & Mighell, A.D. [Show all 9 contributors for this article] (1994). Neutron-powder-diffraction study of the nuclear and magnetic structures of the oxygen-defficient perovskite YBaCuCoO5. Journal of Solid State Chemistry. ISSN 0022-4596. 108, p. 80–86. doi: 10.1006/jssc.1994.1012.
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Fjellvåg, Helmer & Karen, Pavel (1994). Crystal structure of ScCl3. Acta Chemica Scandinavica. ISSN 0904-213X. 48, p. 294–297. doi: 10.3891/acta.chem.scand.48-0294. Full text in Research Archive
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Karen, Pavel & Kjekshus, Arne (1994). Citrate-gel syntheses in the Y(O)—Ba(O)—Cu(O) system. Journal of The American Ceramic Society. ISSN 0002-7820. 77, p. 547–552. doi: 10.1111/j.1151-2916.1994.tb07028.x.
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Atanassova, Y.K.; Hadijev, V.G.; Karen, Pavel & Kjekshus, Arne (1994). Raman scattering from YBa2Fe3O8+d. Physical review B (PRB). ISSN 2469-9950. 50, p. 586–589. doi: 10.1103/PhysRevB.50.586. Full text in Research Archive
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Karen, Pavel & Kjekshus, Arne (1994). YBa2Fe3O8 with varied oxygen content. Journal of Solid State Chemistry. ISSN 0022-4596. 112, p. 73–77. doi: 10.1006/jssc.1994.1267.
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Karen, Pavel & Kjekshus, Arne (1993). Magnetic properties of YBaCuCoO5. Acta Chemica Scandinavica. ISSN 0904-213X. 47, p. 1041–1042. doi: 10.3891/acta.chem.scand.47-1041. Full text in Research Archive
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Karen, Pavel; Braaten, O. & Kjekshus, Arne (1992). Chemical phase diagrams for the YBa2Cu3O7 family. Acta Chemica Scandinavica. ISSN 0904-213X. 46, p. 805–840. doi: 10.3891/acta.chem.scand.46-0805. Full text in Research Archive
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Karen, Pavel & Fjellvåg, Helmer (1992). Hydrolysis and structure of carbides related to propadiene. Journal of Alloys and Compounds. ISSN 0925-8388. 178, p. 289–295. doi: 10.1016/0925-8388%2892%2990270-J.
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Karen, Pavel; Kjekshus, Arne & Andresen, A.F. (1992). Superconducting and structural properties of Sr-substituted YBa2Cu4O8. Acta Chemica Scandinavica. ISSN 0904-213X. 46, p. 1059–1064. doi: 10.3891/acta.chem.scand.46-1059. Full text in Research Archive
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Karen, Pavel; Fjellvåg, Helmer & Kjekshus, Arne (1992). Superconductivity in Y(Ba1−yLay)2Cu3O9−d. Journal of Solid State Chemistry. ISSN 0022-4596. 97, p. 257–273. doi: 10.1016/0022-4596%2892%2990033-R.
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Karen, Pavel; Andresen, P.H. & Kjekshus, Arne (1992). YBa2Fe3O8 and the YCu(O)—BaCu(O)—YFe(O)—BaFe(O) phase diagram. Journal of Solid State Chemistry. ISSN 0022-4596. 101, p. 48–58. doi: 10.1016/0022-4596%2892%2990199-6.
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Fjellvåg, Helmer & Karen, Pavel (1992). The crystal structure of magnesium sesquicarbide. Inorganic Chemistry. ISSN 0020-1669. 31, p. 3260–3263. doi: 10.1021/ic00041a018.
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Huang, Q.; Karen, Pavel; Karen, V.L.; Kjekshus, Arne; Lynn, J.W. & Mighell, A.D. [Show all 8 contributors for this article] (1992). Neutron-powder-diffraction study of the nuclear and magnetic structures of YBa2Fe3O8 at room temperature. Physical review B (PRB). ISSN 2469-9950. 45, p. 9611–9619. doi: 10.1103/PhysRevB.45.9611. Full text in Research Archive
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Karen, Pavel; Fjellvåg, Helmer; Kjekshus, Arne & Andresen, A.F. (1991). On phase relations, structural and magnetic properties of the stable manganese carbides Mn23C6, Mn5C2 and Mn7C3. Acta Chemica Scandinavica. ISSN 0904-213X. 45, p. 549–557. doi: 10.3891/acta.chem.scand.45-0549. Full text in Research Archive
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Andresen, P.H.; Fjellvåg, Helmer; Karen, Pavel & Kjekshus, Arne (1991). Substitution for copper in YBa2Cu3O9−d by 3d- and pre-transition metals. Acta Chemica Scandinavica. ISSN 0904-213X. 45, p. 698–708. doi: 10.3891/acta.chem.scand.45-0698. Full text in Research Archive
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Karen, Pavel; Fjellvåg, Helmer; Kjekshus, Arne & Andresen, A.F. (1991). Chemical pressure and other effects of strontium substitution in YBa2Cu3O9−d. Journal of Solid State Chemistry. ISSN 0022-4596. 92, p. 57–67. doi: 10.1016/0022-4596%2891%2990242-A.
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Karen, Pavel; Fjellvåg, Helmer; Kjekshus, Arne & Andresen, A.F. (1991). Lanthanum substitution for barium in YBa2Cu3O9−d. Journal of Solid State Chemistry. ISSN 0022-4596. 93, p. 163–172. doi: 10.1016/0022-4596%2891%2990285-P.
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Woodward, Patrick M.; Karen, Pavel; Evans, John S. O. & Vogt, Thomas (2021). Solid State Materials Chemistry. Cambridge University Press. ISBN 9780521873253. 708 p.
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Karen, Pavel & Furuseth, Sigrid Breien (2004). KJM1010 Kjemiske strukturer og prinsipper - Tilleggskompendium: Konsepter i uorganisk reaksjonskjemi. Universitetet i Oslo, Reprosentralen. 24 p.
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Karen, Pavel & Benneche, Tore (2004). KJM1010 Kjemiske strukturer og prinsipper - Laboratoriekurs. Universitetet i Oslo, Reprosentralen. 81 p.
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Karen, Pavel (2008). Most pressurized elements aren't simple cubic. Physics today. ISSN 0031-9228. 61, p. 10–10.
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Karen, Pavel (2008). Valence mixing and ordering in RBaFe2O5+w.
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Karen, Pavel (2007). Valence-mixed compounds (Fe3O4 and RBaFe2O5).
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Karen, Pavel (2005). What is Verwey transition and why it may matter.
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Karen, Pavel (2005). Nonstoichiometry in oxides and its control.
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Karen, Pavel (2004). What RBaFe2O5+w tells us about Verwey transition and why it matters.
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Karen, Pavel (2002). Charge ordering that only succeeds after nature's second attempt.
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Karen, Pavel; Woodward, Patrick M. & Lindén, Johan (2002). Charge ordering that only succeeds after nature's second attempt.
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Lindén, Johan; Nakamura, Jin; Karen, Pavel; Kjekshus, Arne; Karppinen, Maarit & Yamauchi, Hisao (2000). Observation of mixed-valence state in the BaSm(Cu1-xFex)2O5+.delta.double-perovskite phase.
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Karen, Pavel (1999). Ordering, Mixed-Valence and Metallic Character Along the Redox Range in LnBaM2O5+w (M = Fe and Co). Show summary
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Karen, Pavel (2017). KJM 1120 Uorganisk kjemi, Laboratoriekurs høstsemester 2017. Reprosentralen UiO.
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Published Nov. 11, 2010 9:00 AM
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