HREM Study of Epitaxially Stabilized Hexagonal Rare Earth Manganites

Autor:	V.L. Svetchnikov, I. E. Graboy, Andrey R. Kaul, J.-P. Senateur, A. A. Bosak, Catherine Dubourdieu, O. Yu. Gorbenko, Henny W. Zandbergen
Rok vydání:	2003
Předmět:	Materials science Hexagonal crystal system General Chemical Engineering Hexagonal phase Mineralogy Heterojunction General Chemistry Epitaxy Crystallography Materials Chemistry Metalorganic vapour phase epitaxy Thin film Layer (electronics) Perovskite (structure)
Zdroj:	Chemistry of Materials. 15:2632-2637
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm021315b
Popis:	The formation of the high-temperature hexagonal modification of DyMnO3 and nonexisting as bulk hexagonal EuMnO3, GdMnO3, and SmMnO3 was observed on ZrO2(Y2O3) (111) substrates at 900 °C due to epitaxial stabilization. HREM study reveals epitaxial growth of the hexagonal film of limited thickness depending on the nature of the rare earth cation. For thickness exceeding critical, the oriented stable perovskite form grows semicoherently on the hexagonal phase. The interface of two polymorphs is not abrupt and involves the formation of the transition zone with the characteristic pyramid-like shapes on the top of the hexagonal layer. The typical structural defects in the hexagonal RMnO3 films are described.
Databáze:	OpenAIRE
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