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Investigations of atomic structure and bonding at domain boundaries in bulk La 0.5 Eu 0.2 Sr 0.3 MnO 3
Author(s) -
Sun B. Z.,
He L. L.,
Luo F.,
Yan C. H.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200420063
Subject(s) - orthorhombic crystal system , perovskite (structure) , crystallography , materials science , octahedron , domain (mathematical analysis) , condensed matter physics , grain boundary , diffraction , symmetry (geometry) , phase (matter) , orientation (vector space) , crystal structure , chemistry , geometry , physics , microstructure , mathematics , optics , mathematical analysis , organic chemistry
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)