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- W2037054160 abstract "An X-ray powder diffraction study of the series CaTi1−2xFexNbxO3is presented. The series comprises orthorhombic perovskites (Pbnm,a≈b≈√2ap,c≈2ap,Z=4) in the range 0≤x≤0.3, and monoclinic perovskites (P21/n,a≈b≈√2ap,c≈2ap,β≠90°,Z=4) in the range 0.4≤x≤0.5. The structure of the orthorhombic members is derived from the cubic aristotype by octahedral rotationa−a−c+. The structural distortion in the monoclinic members involves octahedral rotation and short-range cation ordering at theB-site (4cand 4d). In the series CaTi1−2xFexNbxO3, the unit-cell parameters and degree of octahedral rotation increase withx. The [111]ptilt angle increases from 16.1° in CaTiO3to 17.6–18.9° in CaFe1/2Nb1/2O3(for the NbO6and FeO6octahedra, respectively). In contrast to previous studies, here the diffraction pattern of the end-member CaFe1/2Nb1/2O3is interpreted to exhibit splitting of thehklandh0llines indicative of a monoclinic derivative of the CaTiO3-type structure." @default.
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- W2037054160 date "1998-07-01" @default.
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- W2037054160 title "A Structural Study of the Perovskite Series CaTi1−2xFexNbxO3" @default.
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- W2037054160 doi "https://doi.org/10.1006/jssc.1998.7803" @default.
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