Abstract
The effect of cation composition in LaNi1-x Fe x O3-δ on oxygen nonstoichiometry has been investigated with iodometric titration. For LaNi0.6Fe0.4O3-δ , temperature and oxygen partial pressure dependence of oxygen nonstoichiometry has been determined by equilibrium thermogravimetry. The P(O2) and temperature dependence of the electrical conductivity of LaNi0.6Fe0.4O3-δ has also been measured. It has been clarified that δ generates with Ni substitution and maximum δ was observed for LaNi0.6Fe0.4O3-δ . Temperature and P(O2) dependence of oxygen nonstoichiometry and electrical conductivity is small for LaNi0.6Fe0.4O3-δ , probably because variation of average valence of B-site ion by temperature and P(O2) is small since charge compensation between Ni and Fe is easy to occur. The easy occurrence of the charge compensation corresponds to hopping conduction with small, temperature and P(O2) independent activation energy. By combination of oxygen nonstoichiometry and electrical conductivity, it has been clarified that LaNi0.6Fe0.4O3-δ is p-type conductor with mobility of 0.257 cm2V-1s-1, which is independent on temperature and P(O2). Hole concentration at temperatures between 300 °C and 800 °C under -4 ≤ log{P(O2)/bar}≤0 is 3~4 x1021 cm-3.
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