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- W2073307834 abstract "Four compounds of the Bi4Ti3O12/BiFeO3 system with the formula Bi2Bin−1(Ti,Fe)nO3n+3, n = 3, 4, 4.5 and 6 were studied using high-temperature X-ray powder diffraction and differential thermoanalysis methods. The crystal structure of the n = 6 phase was refined by the Rietveld method. An unusual behaviour of thermal expansion attributed to an orthorhombic-to-tetragonal transformation was revealed. For all the compounds, the lattice parameter c vs temperature T dependence has three regions in the range of T = 20 –750 °C interpreted as (1) expansion of the initial orthorhombic phase, (2) a pronounced structure reconstruction to the tetragonal phase, (3) an expansion of the tetragonal phase. The crystal structure of Bi7Ti3Fe3O21 based on 6-layer-perovskite blocks is proposed from X-ray powder diffraction data. The Rietveld refinement of the structure in the orthorhombic space group F2mm with lattice parameters a = 5.4699(3), b = 5.4924(3), c = 57.551(3) Å (Rp = 9.4, Rwp = 11.9, Rexp = 4.7, RB = 4.4 %) shows that a distorted 6-layer model fits the data of Bi7Ti3Fe3O21." @default.
- W2073307834 created "2016-06-24" @default.
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- W2073307834 date "2005-07-01" @default.
- W2073307834 modified "2023-09-26" @default.
- W2073307834 title "Aurivillius Phases in the Bi4Ti3O12/BiFeO3 System: Thermal Behaviour and Crystal Structure" @default.
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- W2073307834 doi "https://doi.org/10.1002/zaac.200500130" @default.
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