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X-Ray Diffraction Study of the Decomposition Process Occurring in Single Crystals of the K2NiF4-Type Aluminate LaCaAlO4

✍ Scribed by Yr. Smirnov; I. Zvereva; J. Choisnet

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 242 KB
Volume: 134
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1997.7557

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✦ Synopsis

The results of an X-ray diffraction study of the decomposition process occurring in the K 2 NiF 4 -type aluminate LaCaAlO 4 are reported. The experimental data concern two small single crystals heated for 1 and 10 h at 1200°C, respectively. As a final result, the presence of LaAlO 3 perovskite and CaO is unambiguously observed. After 1 h of heating, several intermediate phases can be identified as small-size LaAlO 3 -like microprecipitates. Well-defined orientation phenomena with respect to the matrix LaCaAlO 4 are evidenced for these phases and for CaO as well. On the basis of the variation of the perovskite cell volume of the intermediate phases, the decomposition process is tentatively modeled. In this respect, a tetragonal phase is considered as the precursor of LaAlO 3 perovskite.

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