Abstract
Oxygen nonstoichiometry and electrical resistance of a series of La2−xSrxNiO4±δ solid solutions with x=0.0–1.4 were investigated in argon/O2 (pO2=1.5–286 Pa) within a temperature range of 20–1050°C. The oxygen permeability of gas tight ceramics was determined. Increasing strontium content from 0 to 0.4 was found to decrease the amount of weak bonded oxygen, which can be reversibly exchanged with oxygen in the gaseous phase (T=250–550°C). The equilibrium values of oxygen nonstoichiometry and specific resistance of the nickelates with 0.0≤x≤0.5 were determined as functions of temperature and oxygen partial pressure. The nickelates studied appear to be p-type conductors. Oxygen permeability of nickelates with x=0–0.4 increases in accordance with the increasing range of the oxygen nonstoichiometry (T>800°C, the pO2 gradient is (0.21×105 to 200) Pa).
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