• All-oxide thermoelectric module with in situ formed non-rectifying complex p-p-n junction and transverse thermoelectric effect 

      Kanas, Nikola; Bittner, Michael; Desissa, Temesgen Debelo; Singh, Sathya Prakash; Norby, Truls Eivind; Feldhoff, Armin; Grande, Tor; Wiik, Kjell; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)
      All-oxide thermoelectric modules for energy harvesting are attractive due to high temperature stability, low cost, and the potential to use non-scarce and non-toxic elements. Thermoelectric modules are mostly fabricated ...
    • Chemical stability of Ca3Co4−xO9+δ/CaMnO3−δ p–n junction for oxide-based thermoelectric generators 

      Gunnæs, Anette Eleonora; Tofan, Raluca; Berland, Kristian; Gorantla, Sandeep Madhukar; Storaas, Thomas Aarflot; Desissa, Temesgen Debelo; Schrade, Matthias; Persson, Clas; Einarsrud, Mari-Ann; Wiik, Kjell; Norby, Truls Eivind; Kanas, Nikola (Peer reviewed; Journal article, 2020)
      An all-oxide thermoelectric generator for high-temperature operation depends on a low electrical resistance of the direct p–n junction. Ca3Co4−xO9+δ and CaMnO3−δ exhibit p-type and n-type electronic conductivity, respectively, ...
    • Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO3-δ with CaMn2O4 precipitates 

      Desissa, Temesgen D.; Kanas, Nikola; Singh, Sathya Prakash; Wiik, Kjell; Einarsrud, Mari-Ann; Norby, Truls Eivind (Journal article; Peer reviewed, 2018)
      Diffusivity on the A- and B-site of polycrystalline perovskite CaMnO3-δ with Ca deficiency and spinel CaMn2O4 (marokite) as a secondary phase was studied using chemical tracers and secondary ion mass spectrometry (SIMS) ...
    • Influence of processing on stability, microstructure and thermoelectric properties of Ca3Co4-xO9+δ 

      Kanas, Nikola; Singh, Sathya Prakash; Rotan, Magnus; saleemi, Mohsin; Bittner, Michael; Feldhoff, Armin; Norby, Truls Eivind; Wiik, Kjell; Grande, Tor (Journal article; Peer reviewed, 2018)
      Due to high figure of merit, Ca3Co4-xO9+δ (CCO) has potential as p-type material for high-temperature thermoelectrics. Here, the influence of processing including solid state sintering, spark plasma sintering and ...
    • Inter-diffusion across a direct p-n heterojunction of Li-doped NiO and Al-doped ZnO 

      Desissa, Temesgen D.; Haugsrud, Reidar; Wiik, Kjell; Norby, Truls Eivind (Journal article; Peer reviewed, 2018)
      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 ...
    • Surface reactivity and cation non-stoichiometry in BaZr1-xYxO3-δ (x=0-0.2) exposed to CO2 at elevated temperature 

      Sazinas, Rokas; Sunding, Martin Fleissner; Thøgersen, Annett; Sakaguchi, Isao; Norby, Truls Eivind; Grande, Tor; Polfus, Jonathan M. (Journal article; Peer reviewed, 2019)
      The reactivity of BaZr1−xYxO3−δ (x = 0–0.2) ceramics under 1 atm CO2 at 650 °C for up to 1000 h was investigated in order to elucidate possible degradation processes occurring when the material is applied as a proton-conducting ...
    • Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900 °C under reducing conditions 

      Singh, Sathya Prakash; Kanas, Nikola; Desissa, Temesgen Debelo; Johnsson, Mats; Einarsrud, Mari-Ann; Norby, Truls Eivind; Wiik, Kjell (Journal article; Peer reviewed, 2019)
      Lanthanum doped strontium titanate is a potential n-type thermoelectric material at moderate and high temperatures. (La0.12Sr0.88)0.95TiO3 ceramics were prepared by two different routes, conventional sintering at 1500 °C ...
    • Thermoelectric Properties of Ca3Co2−xMnxO6 (x = 0.05, 0.2, 0.5, 0.75, and 1) 

      Kanas, Nikola; Singh, Sathya Prakash; Rotan, Magnus; Desissa, Temesgen Debelo; Grande, Tor; Wiik, Kjell; Norby, Truls Eivind; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2019)
      High-temperature instability of the Ca3Co4−yO9+δ and CaMnO3−δ direct p-n junction causing the formation of Ca3Co2−xMnxO6 has motivated the investigation of the thermoelectric performance of this intermediate phase. Here, ...
    • Thermoelectric properties of non-stoichiometric CaMnO3-d composites formed by redox-activated exsolution. 

      Singh, Sathya Prakash; Kanas, Nikola; Desissa, Temesgen Debelo; Einarsrud, Mari-Ann; Norby, Truls Eivind; Wiik, Kjell (Journal article; Peer reviewed, 2019)
      A novel synthesis route for preparing well-defined composites based on CMO (CaMnO3) has been established taking advantage of the unique phase relations in the system Ca-Mn-O at reducing- and oxidizing atmosphere, respectively. ...