Isomorphous substitutions in sillenite-family single-crystal Bi24(M2-Mn4+)O40 solid solutions (M = Al3+, Fe3+, Ge4+, Ti4+, Cr4+, V5+)
| Autor: | Galina M. Kuz’micheva, T. I. Mel’nikova, Yan V. Zubavichus, Irina A. Kaurova, Vladimir I. Nikolaychik |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Extended X-ray absorption fine structure 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences XANES Ion Inorganic Chemistry symbols.namesake Crystallography Impurity 0103 physical sciences Materials Chemistry symbols Isostructural 0210 nano-technology Raman spectroscopy Single crystal Solid solution |
| Zdroj: | Journal of Crystal Growth. 507:413-420 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/j.jcrysgro.2018.12.012 |
| Popis: | Single-crystal sillenite-type Bi24(M2-xMn4+x)O40 (M = Al3+, Fe3+, Ge4+, Ti4+, Cr4+, V5+) solid solutions have been studied by a complex of methods: single crystal and powder X-ray diffraction; EXAFS/XANES, IR and Raman spectroscopies; scanning and transmission electron microscopies; electron probe X-ray microanalysis. Structures of Bi24(M2-xMnx)O40 (M = Al, Fe, V, Ge) solid solutions contain Mn ions with two formal charges, Mn4+ and Mn5+, as well as vacancies in the Bi (M = V) and O (M = Cr, Fe, Al, V) sites. For the Bi24(M2-xMnx)O40 (M = Fe, Cr, V), a partial occurrence of Bi atoms in the tetrahedral sites has been detected by X-ray diffraction, which was confirmed by IR and Raman spectroscopies. Two isostructural sillenite-type solid solutions based on the Bi24Mn2O40 and γ-Bi2O3 with the impurity phases Mn2O3 and Bi2Mn4O10 were found in the system with M = Cr. Limits for isomorphic substitutions in the Bi24(M2-xMnx)O40 (M = Al, Fe, Ge, Ti, Cr, V) systems were theoretically estimated and compared with the experimental results obtained. A potential of elaborated combination of methods aimed at determining the precise real composition of solid solutions not identical to that of the initial charge was demonstrated. Homogeneity regions for sillenite family phases were predicted. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect