Oxygen nonstoichiometry of La sub 1 minus x Sr sub x CoO sub 3 minus. delta. (0 < x le 0. 6)

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90066-7· OSTI ID:6335894

Petrov, A N; Cherepanov, V A; Kononchuk, O F; Gavrilova, L Ya ^[1]

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1. Ural's State Univ., Sverdlovsk (USSR)

The oxygen nonstoichiometry ({delta}) of La{sub 1{minus}x}Sr{sub x}CoO{sub 3{minus}{delta}} (0 < x {le} 0.6) has been studied as a function of temperature (573-1,673 K) and oxygen partial pressure (1{minus}10{sup {minus}3} atm) using TGA and coulometric titration techniques. The absolute values of oxygen nonstoichiometry were determined by the direct reduction in a flux of hydrogen (TGA) or by decreasing P{sub O{sub 2}} in a coulometric titration cell. The boundaries of phase stability of La{sub 0.7}Sr{sub 0.3}CoO{sub 3{minus}{delta}} and (La{sub 0.7}Sr{sub 0.3}){sub 2}CoO{sub 4{plus minus}v} were evaluated. A possible mechanism of disordering processes has been discussed.

• OSTI ID: 6335894
• Journal Information: Journal of Solid State Chemistry; (USA), Vol. 87:1; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT OXIDES
STOICHIOMETRY
EXPERIMENTAL DATA
LANTHANUM
MEASURING INSTRUMENTS
MEASURING METHODS
PARTIAL PRESSURE
STRONTIUM
TEMPERATURE DEPENDENCE
ALKALINE EARTH METALS
CHALCOGENIDES
COBALT COMPOUNDS
DATA
ELEMENTS
INFORMATION
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
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