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- W1985738180 endingPage "295219" @default.
- W1985738180 startingPage "295219" @default.
- W1985738180 abstract "Electron magnetic resonance (EMR) studies reveal different spectroscopic properties of transition ions doped in the two crystallographically different forms of barium titanate: cubic (normal) c-BaTiO3 and hexagonal polymorph h-BaTiO3. Recent comparative analysis of EMR data helped to solve the controversy concerning the disparate zero-field splitting (ZFS) parameters for Fe3+ ions in c-BaTiO3. This paper deals with the low symmetry aspects inherent in EMR studies of the orthorhombic to monoclinic structural phase transition in h-BaTiO3 doped by Fe3+ ions. Pertinent spin Hamiltonian notations and choices of axis systems are clarified. The second- and fourth-rank ZFS parameters determined by EMR and the second-rank ones computed using a superposition model for the Fe3+ ions in h-BaTiO3 are reanalyzed. The available ZFS parameters are presented in a well-defined axis system and in a unified way to ensure meaningful comparison. Pertinent transformations of ZFS parameters are carried out using the package CST. Simulations of the low symmetry ZFS parameters are carried out to assess the role of monoclinic and triclinic ZFS terms and to investigate the low symmetry aspects arising with lowering of temperature during the orthorhombic to monoclinic structural phase transition in Fe3+:h-BaTiO3. The procedure for analyzing experimental and theoretical ZFS parameters for transition ions at monoclinic and triclinic symmetry sites proposed here enables a better understanding of the low symmetry aspects involved. This study suggests the need to extend superposition model analysis to the fourth-rank ZFS terms for Fe3+ centers in h-BaTiO3." @default.
- W1985738180 created "2016-06-24" @default.
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- W1985738180 date "2008-07-01" @default.
- W1985738180 modified "2023-09-27" @default.
- W1985738180 title "Low symmetry aspects inherent in EMR studies of the orthorhombic to monoclinic structural phase transition in the hexagonal form of barium titanate BaTiO3doped by Fe3+ions" @default.
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- W1985738180 doi "https://doi.org/10.1088/0953-8984/20/29/295219" @default.
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