Reidar Haugsrud

• Desissa, Temesgen D.; Haugsrud, Reidar; Wiik, Kjell & Norby, Truls Eivind (2018). Inter-diffusion across a direct p-n heterojunction of Li-doped NiO and Al-doped ZnO. Solid State Ionics.  ISSN 0167-2738.  320, s 215- 220 . doi: 10.1016/j.ssi.2018.03.011 Show summary

  We herein report inter-diffusion across the interface between p-type Ni0.98Li0.02O and n-type Zn0.98Al0.02O for various applications including p-n-heterojunction diodes and oxide thermoelectrics. Diffusion couples were made of polished surfaces of ceramic samples pre-sintered at 1250 and 1350 °C for Ni0.98Li0.02O and Zn0.98Al0.02O, respectively. The inter-diffusion couples were annealed at 900–1200 °C for 160 h in ambient air. Electron Probe Micro Analysis (EPMA) was used to acquire diffusion profiles, followed by fitting to Fick's second law and Whipple–Le Claire's models for bulk and grain-boundary diffusion calculation, respectively. Zn2+ diffused into Ni0.98Li0.02O mainly by bulk diffusion with an activation energy of 250 ± 10 kJ/mol, whereas Ni2+ diffused into Zn0.98Al0.02O by both bulk and enhanced grain boundary diffusion with activation energies of 320 ± 120 kJ/mol and 245 ± 50 kJ/mol, respectively. The amount of Al3+ diffused from the Al-doped ZnO into the NiO phase was too small for a corresponding diffusion coefficient to be calculated. Li-ion distribution and diffusivity were not determined due to lack of analyzer sensitivity for Li. The bulk and effective diffusivities of Zn2+ and Ni2+ into NiO and ZnO enable prediction of inter-diffusion lengths as a function of time and temperature, allowing estimates of device performance, stability, and lifetimes at different operation temperatures.

• Escolastico, S; Solis, C; Haugsrud, Reidar; Magraso, Anna & Serra, J. M. (2017). On the ionic character of H2 separation through mixed conducting Nd5.5W0.5Mo0.5O11.25−δ membrane. International journal of hydrogen energy.  ISSN 0360-3199.  42(16), s 11392- 11399 . doi: 10.1016/j.ijhydene.2017.02.087
• Hancke, Ragnhild & Haugsrud, Reidar (2017). The correlation between surface kinetic and bulk diffusion properties of proton conducting oxides. Solid State Ionics.  ISSN 0167-2738.  306, s 48- 54 . doi: 10.1016/j.ssi.2017.02.006
• Liu, Xin; Bjørheim, Tor Svendsen & Haugsrud, Reidar (2017). Formation and migration of hydride ions in BaTiO3-xHx oxyhydride. Journal of Materials Chemistry A.  ISSN 2050-7488.  5(3), s 1050- 1056 . doi: 10.1039/c6ta06611a

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• Desissa, Temesgen D.; Norby, Truls Eivind & Haugsrud, Reidar (2018). Stability and properties of materials and interfaces for oxide thermoelectrics. Series of dissertations submitted to the Faculty of Mathematics and Natural Sciences, University of Oslo.. 1969.
• Liu, Xin; Haugsrud, Reidar; Bjørheim, Tor Svendsen & Fjellvåg, Helmer (2018). Defect, Stability and Transport in Oxyhydrides. Series of dissertations submitted to the Faculty of Mathematics and Natural Sciences, University of Oslo.. 1980.
• Clark, Daniel Ryan; Kjølseth, Christian; Malerød-Fjeld, Harald; Hernandez Morejudo, Selene; Zanon, R.; Serra, J; Beeaff, Dustin; Vigen, Camilla Kaori; Tirados, Irene Yuste; Vestre, Per Kristian & Haugsrud, Reidar (2017). Intensified Conversion of Natural Gas Using Proton-Conducting Ceramics.
• Emhjellen, Linn Katinka; Haugsrud, Reidar; Bjørheim, Tor Svendsen & Strandbakke, Ragnar (2017). Defects and Transport in SrFe1-xMoxO3-δ.
• Haugsrud, Reidar; Chen, Min & Bjørheim, Tor Svendsen (2017). SSPC-18 Conference Special Issue. Solid State Ionics.  ISSN 0167-2738.  306, s 1 . doi: 10.1016/j.ssi.2017.04.012
• Li, Zuoan & Haugsrud, Reidar (2017). Oxygen dissociation rate of oxide ion conductors determined by a novel gas phase analysis technique.

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