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Oxygen non-stoichiometry and electrical conductivity of the binary strontium cobalt oxide SrCoOx

Authors
Journal
Solid State Ionics
0167-2738
Publisher
Elsevier
Publication Date
Volume
99
Identifiers
DOI: 10.1016/s0167-2738(97)00192-6
Keywords
  • Strontium Cobaltite
  • Phase Transformation
  • Oxygen Stoichiometry
  • Electrical Conductivity

Abstract

Abstract Strontium cobaltite was investigated using solid-electrolyte coulometry and resistivity measurements in the temperature range 20–1050°C and oxygen partial pressures 0.5–400 Pa. Two observed oxygen desorption/sorption maxima within the temperature range 500–950°C correlate with phase transitions of this compound as reported in the literature. An additional oxygen desorption/sorption maximum was found at a temperature of 965–1000°C, which is explained an order-disorder transition of the cubic high-temperature phase. The dependencies of equilibrium values of oxygen content as well as specific resistivity on temperature and oxygen partial pressure were founded for the cubic phase.

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