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- W2052822874 abstract "The solid solutions Bi2−xSr2+xTi1−xNb2+xO12 (0<x<0.6). (1) and Bi4−xLaxTi3O12 (x=1 and 2) (2) have been analyzed in detail by a combination of powder X-ray and neutron diffraction. Both solid solutions adopt a tetragonal variant of the archetypal three-layer Aurivillius phase structure of the parent phase Bi4Ti3O12. The X-ray studies of (1) clearly show that, contrary to earlier assumptions, Sr2+ partially substitutes into the [Bi2O2] layers, even at the stoichiometric composition Bi2Sr2TiNb2O12, the maximum amount of substitution being about 30% at x=0.6. The neutron study demonstrates that the Sr2+ in this site adopts a significantly more isotropic coordination environment than Bi3+, thus stabilizing this unexpected disorder. The disorder is shown to be driven by the requirement for size matching of the fluorite-like and perovskite-like layers. A similar level of disorder is found in Bi2La2Ti3O12, and this is shown to be due to the requirements for optimum local coordination environment at the La3+/Bi3+ sites." @default.
- W2052822874 created "2016-06-24" @default.
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- W2052822874 date "2000-08-01" @default.
- W2052822874 modified "2023-10-14" @default.
- W2052822874 title "Cation Disorder in Three-Layer Aurivillius Phases: Structural Studies of Bi2−xSr2+xTi1−xNb2+xO12 (0<x<0.8) and Bi4−xLaxTi3O12 (x=1 and 2)" @default.
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- W2052822874 doi "https://doi.org/10.1006/jssc.2000.8741" @default.
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