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Investigations of atomic structure and bonding at domain boundaries in bulk La0.5Eu0.2Sr0.3MnO3

✍ Scribed by Sun, B. Z. ;He, L. L. ;Luo, F. ;Yan, C. H.

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
363 KB
Volume
202
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

Perovskite ceramic samples of bulk La~0.7~Sr~0.3~MnO~3~ doped with Eu are prepared by usual thermal decomposition and grinding procedure. Besides La~0.7~Sr~0.3~MnO~3~ rhombohedral phase, with the substitution of Eu^3+^ for La^3+^, another perovskite‐based structure with orthorhombic symmetry and space group Pnma can be identified by means of electron diffraction patterns (EDP) and energy‐dispersive X‐ray spectroscopy (EDX). Many 120° large‐angle orientation domains with a three‐fold rotational symmetry relationship are observed in the orthorhombic grain. According to group theory of phase transformation and matrix analyses, the 120° orientation domain originates from the three‐fold symmetry axis of pseudo‐cubic parent phase. Meanwhile, a projected model of the domain boundary is constructed based on their orientation relationships. The distortions and arrangements of MnO~6~ octahedra on the domain boundary are discussed particularly. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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