Investigation of the alpha-BiOyF3-2y-Based Tysonite-type Solid Solutions by X-ray Diffraction and Impedance Spectroscopyстатья

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Дата последнего поиска статьи во внешних источниках: 20 сентября 2013 г.

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[1] Investigation of the alpha-bioyf3-2y-based tysonite-type solid solutions by x-ray diffraction and impedance spectroscopy / V. A. Prituzhalov, R. Y. Zakirov, E. I. Ardashnikova, V. A. Dolgikh // Russian Journal of Inorganic Chemistry. — 2008. — Vol. 53, no. 1. — P. 129–135. Tysonite solid solutions Bi1-xMx(O,F)(3-d) (M = Na, Sr, or Nd) based on alpha-BiOyF(3-2y) were prepared by solid-state synthesis at 873 K with subsequent quenching to ice-cold water. Aliovalent substitutions in both the cation and anion sublattices (Mn+–> Bi3+ and O2—> F-) made it possible to vary the anion-vacancy density. The solid solutions were characterized by X-ray diffraction and impedance spectroscopy. The homogeneity regions for the tysonite solid solution were determined; triangulation schemes at 873 K were suggested for the systems BiF3-BiOF-NaBiF4 and BiF3-BiOF-SrF2, and a scheme of the subsolidus phase diagram for the system BiO0.1F2.8-NdF3 was suggested. In the system BiO0.1F2.8-NdF3, the transition temperature from the low-symmetry tysonite phase (phase II, space group P (3) over bar c1, Z = 6) to the high-symmetry one (phase I, space group P6(3)/mmc, Z = 2) decreases with increasing anion-vacancy density. Conductivity measurements were performed in the temperature range 300-523 K and the frequency range from 5 to 1 x 106 Hz. The conductivity of samples in the system BiO0.1F2.8-NdF3 increases with increasing bismuth-ion and anion-vacancy concentrations. [ DOI ]

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