Abstract: Phase transformations in a sample from the series La1−x Sr x FeO3−δ (x = 0.75) with cubic symmetry and perovskite type structure were studied by high-temperature X-ray diffraction. In air, the solid solution was stable to the synthesis temperature (1200°C), despite the loss of some part of oxygen. Heating in vacuum led to a two-phase state at 900°C (or even at 600°C when a small amount of palmitic acid was added to the sample); the unit cell parameter changed abruptly. The amount of the new phase increased with temperature, and at 1000°C, the sample, as well as the starting phase, was monophase perovskite with cubic symmetry; i.e., an isosymmetric phase transition occurred, which was accompanied by an abrupt change in the cell volume. Cooling in vacuum to ∼800°C led to the ordering of the oxygen vacancies and the formation of a Grenier phase type structure. When the sample was heated again in vacuum, a reversible phase transition occurred from the Grenier phase type structure to a perovskite structure (again at ∼800°C).

Cite: Nadeev A.N. , Tsybulya S.V. , Gerasimov E.Y. , Isupova L.A.
High-Temperature Phase Transitions in the La0.25Sr0.75FeO3−δ Solid Solution with a Perovskite Structure
Journal of Structural Chemistry. 2009. V.50. N1. P.108-113. DOI: 10.1007/s10947-009-0014-2 WOS Scopus РИНЦ ANCAN OpenAlex

Original: Надеев А.Н. , Цыбуля С.В. , Герасимов Е.Ю. , Исупова Л.А.
Высокотемпературные фазовые переходы в твердом растворе La0.25Sr0.75FeO3−δ со структурой перовскита
Журнал структурной химии. 2009. Т.50. №1. С.114-120. RSCI РИНЦ

Dates:

Submitted:	Apr 30, 2008
Published print:	Feb 1, 2009
Published online:	Mar 25, 2009

Identifiers:

Web of science:	WOS:000264549000014
Scopus:	2-s2.0-63349110030
Elibrary:	13597870
Chemical Abstracts:	2009:356430
Chemical Abstracts (print):	151:138217
OpenAlex:	W1982882811

Citing:

DB	Citing
Web of science	3
Scopus	4
Elibrary	2
OpenAlex	2

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