We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Analysis of thermal stability of LaNiFeO ( x = 0.0, 0.2, 0.4) by thermogravimetry and high-temperature X-ray diffraction under controlled oxygen partial pressures.
- Authors
Morishima, Yuta; Niwa, Eiki; Hashimoto, Takuya
- Abstract
Thermodynamic stability of LaNiFeO ( x = 0.0, 0.2, 0.4), which is expected as new cathode material for solid oxide fuel cells, was investigated by thermogravimetry and high-temperature X-ray diffraction under controlled oxygen partial pressure, P(O). It was clarified that LaNiO decomposed through LaNiO to LaNiO with increasing temperature under P(O) of 10 atm or more. The decomposition temperature decreased with reducing P(O). Under P(O) of 10 atm, LaNiO directly decomposed to LaNiO. The decomposition of LaNiFeO ( x = 0.2, 0.4) to La(NiFe)O was also observed, and Ellingham diagram of the decomposition reaction was prepared. It was revealed that thermodynamically stable temperature and P(O) region expanded with increasing Fe content. Nonlinear decomposition boundary was observed in the Ellingham diagram of LaNiO and LaNiFeO whose origin can be suspected to the difference of δ at the decomposition on P(O). Linear decomposition boundary was observed for LaNiFeO, indicating variation of entropy, Δ S°, and enthalpy, Δ H°, at the decomposition were 151 J mol K and 240 kJ mol, respectively.
- Subjects
THERMAL stability; IRON oxides; THERMOGRAVIMETRY; HIGH temperatures; X-ray diffraction; OXYGEN analysis; PRESSURE
- Publication
Journal of Thermal Analysis & Calorimetry, 2016, Vol 123, Issue 3, p1769
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-015-4702-1