NDLI: Oxygen stoichiometry, unit cell volume, and thermodynamic quantities of perovskite-type oxides

Content Provider	Springer Nature Link
Author	Girdauskaite, Egle Ullmann, Helmut Daroukh, Mahmoud Vashook, Vladimir Bülow, Martin Guth, Ulrich
Copyright Year	2006
Abstract	Perovskite-type oxides $${\text{A}}_{{{\text{1 - }}a}} {\text{A}}^{\prime }_{{\text{a}}} {\text{B}}_{{{\text{1 - }}b}} {\text{B}}^{\prime }_{{\text{b}}} {\text{O}}_{{{\text{3 - }}x}}$$ with A, A′=La, Ba, Sr; B, B′=Mn, Fe, Co were investigated by means of thermal analysis, solid electrolyte cells, and X-ray diffraction. Partial molar thermodynamic quantities are determined and their relations with O/M stoichiometry, unit cell volume, and phase stability were studied. The absolute values of partial molar enthalpies of perovskite-type oxides increase with increasing O/M stoichiometries and with decreasing unit cell volumes of the cubic perovskite-type structure, corresponding to higher chemical stabilities. The substitution of Ba for La, Ba for Sr, Co for Fe, and Fe for Mn lead to increase in unit cell volumes and decrease in absolute values of ΔH 0. The ΔH 0 values of the cobaltites/ferrites range from −33.5 kJ/mol for SrCo0.8Fe0.2O3−x to −72.5 kJ/mol for La0.2Sr0.8Co0.6Fe0.4O3−x, and of the manganates up to −132 kJ/mol for Ca0.5Sr0.5Mn0.8Fe0.2O3−x .
Starting Page	469
Ending Page	477
Page Count	9
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	11
Issue Number	4
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Perovskite-type oxides O/M stoichiometry Thermodynamic data Lattice parameters Electronic and Computer Engineering Condensed Matter Characterization and Evaluation Materials Industrial Chemistry/Chemical Engineering Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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