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 04:00:00 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), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 87:1; ISSN 0022-4596; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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&amp; Refractories-- Structure &amp; Phase Studies
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&amp; Refractories-- Physical Properties
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CHALCOGENIDES
COBALT COMPOUNDS
COBALT OXIDES
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LANTHANUM
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTIAL PRESSURE
RARE EARTHS
STOICHIOMETRY
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TRANSITION ELEMENT COMPOUNDS