Promising solid electrolyte material for an IT‐SOFC: crystal structure of the cerium gadolinium holmium oxide Ce0.8Gd0.1Ho0.1O1.9 between 295 and 1023 K. Issue 2 (30th January 2018)

• Record Type: Journal Article
• Authors: Rahayu, Sri; Forrester, Jennifer S.; Kale, Girish M.; Ghadiri, Mojtaba
• Is Part Of: Acta crystallographica. Volume 74:Issue 2(2018)
• Page Start: 236
• Page End: 239
• Publication Date: 2018-01-30
• Subjects: intermediate‐temperature solid oxide fuel cells -- co‐doping -- fluorite -- rare earth oxides -- powder diffraction -- crystal structure -- IT‐SOFC -- holmium -- gadolinium -- cerium -- solid electrolyte -- in situ X‐ray diffraction; Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229617017946
• Languages: English
• ISSNs: 2053-2296

Abstract

Abstract : Rietveld refinements of the powder X‐ray diffraction data of the electrolyte material Ce0.8 Gd0.1 Ho0.1 O1.9 show that it is a fluorite with the space group Fm m and that it has crystal structure stability from room temperature to elevated temperatures. Abstract : The crystal structure of Ce0.8 Gd0.1 Ho0.1 O1.9 (cerium gadolinium holmium oxide) has been determined from powder X‐ray diffraction data. This is a promising material for application as a solid electrolyte for intermediate‐temperature solid oxide fuel cells (IT‐SOFCs). Nanoparticles were prepared using a novel sodium alginate sol‐gel method, where the sodium ion was exchanged with ions of interest and, after washing, the gel was calcined at 723 K in air. The crystallographic features of Gd and Ho co‐doped cerium oxide were investigated around the desired operating temperatures of IT‐SOFCs, i.e. 573 ≤ T ≤ 1023 K. We find that the crystal structure is a stable fluorite structure with the space group Fm m in the entire temperature range. In addition, the trend in lattice parameters shows that there is a monotonic increase with increasing temperature.