Oxidation-reduction Behavior Of Undoped And Sr-doped LaMnO3 Nonstoichiometry And Defect Structure

J. H. Kuo; Harlan U. Anderson; Don M. Sparlin

doi:10.1016/0022-4596(89)90053-4

Oxidation-reduction Behavior Of Undoped And Sr-doped LaMnO3 Nonstoichiometry And Defect Structure

J. H. Kuo
, Harlan U. Anderson
, Don M. Sparlin

Research output: Contribution to journal › Article › peer-review

Abstract

Undoped and Sr-doped LaMnO ₃ showed reversible oxidation-reduction behavior. These perovskites can be excess, stoichiometric or deficient in oxygen content depending on the specific conditions. Under very reducing conditions decomposition into new phases occurs. Phase stabilities for these oxides were determined. The results showed that Sr doping caused the LaMnO ₃ to dissociate at higher oxygen activities than those necessary for undoped LaMnO ₃ . Defect models are proposed to interpret the thermogravimetric results in which metal vacancies are assumed for the oxygen excess condition and oxygen vacancies are assumed for the oxygen deficient condition. Thermodynamic properties were calculated which support the model. © 1989.

Original language	American English
Pages (from-to)	52-60
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	83
Issue number	1
DOIs	https://doi.org/10.1016/0022-4596(89)90053-4
State	Published - Jan 1 1989

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Materials Science and Engineering
Physics

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title = "Oxidation-reduction Behavior Of Undoped And Sr-doped LaMnO3 Nonstoichiometry And Defect Structure",

abstract = " Undoped and Sr-doped LaMnO 3 showed reversible oxidation-reduction behavior. These perovskites can be excess, stoichiometric or deficient in oxygen content depending on the specific conditions. Under very reducing conditions decomposition into new phases occurs. Phase stabilities for these oxides were determined. The results showed that Sr doping caused the LaMnO 3 to dissociate at higher oxygen activities than those necessary for undoped LaMnO 3 . Defect models are proposed to interpret the thermogravimetric results in which metal vacancies are assumed for the oxygen excess condition and oxygen vacancies are assumed for the oxygen deficient condition. Thermodynamic properties were calculated which support the model. {\textcopyright} 1989.",

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T1 - Oxidation-reduction Behavior Of Undoped And Sr-doped LaMnO3 Nonstoichiometry And Defect Structure

AU - Kuo, J. H.

AU - Anderson, Harlan U.

AU - Sparlin, Don M.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Undoped and Sr-doped LaMnO 3 showed reversible oxidation-reduction behavior. These perovskites can be excess, stoichiometric or deficient in oxygen content depending on the specific conditions. Under very reducing conditions decomposition into new phases occurs. Phase stabilities for these oxides were determined. The results showed that Sr doping caused the LaMnO 3 to dissociate at higher oxygen activities than those necessary for undoped LaMnO 3 . Defect models are proposed to interpret the thermogravimetric results in which metal vacancies are assumed for the oxygen excess condition and oxygen vacancies are assumed for the oxygen deficient condition. Thermodynamic properties were calculated which support the model. © 1989.

AB - Undoped and Sr-doped LaMnO 3 showed reversible oxidation-reduction behavior. These perovskites can be excess, stoichiometric or deficient in oxygen content depending on the specific conditions. Under very reducing conditions decomposition into new phases occurs. Phase stabilities for these oxides were determined. The results showed that Sr doping caused the LaMnO 3 to dissociate at higher oxygen activities than those necessary for undoped LaMnO 3 . Defect models are proposed to interpret the thermogravimetric results in which metal vacancies are assumed for the oxygen excess condition and oxygen vacancies are assumed for the oxygen deficient condition. Thermodynamic properties were calculated which support the model. © 1989.

UR - https://scholarsmine.mst.edu/matsci_eng_facwork/3153

U2 - 10.1016/0022-4596(89)90053-4

DO - 10.1016/0022-4596(89)90053-4

M3 - Article

SN - 1095-726X

VL - 83

SP - 52

EP - 60

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 1

ER -

Oxidation-reduction Behavior Of Undoped And Sr-doped LaMnO3 Nonstoichiometry And Defect Structure

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