Studies on n=2 Aurivillius phases: structure of the series Bi3−xLaxTiNbO9 (0≤x≤1)

Autor:	G. Nalini, T. N. Guru Row, G. N. Subbanna
Rok vydání:	2003
Předmět:	Materials science biology Crystal structure Condensed Matter Physics biology.organism_classification Aurivillius Crystallography Electron diffraction X-ray crystallography General Materials Science Orthorhombic crystal system Selected area diffraction Powder diffraction Solid solution
Zdroj:	Materials Chemistry and Physics. 82:663-671
ISSN:	0254-0584
Popis:	The crystal structures of the solid solutions of Bi3-xLaxTiNbO9 (0 less than or equal to x less than or equal to 1) have been analyzed by powder X-ray diffraction with supporting evidence from selected area electron diffraction (SAD). The structure of the starting member (x = 0) is verified to be in the orthorhombic space group A2(1) am while the end member (x = 1) is determined to crystallize in the centrosymmetric orthorhombic space group Pmcb. The structure of x = 1 phase is solved by ab initio powder diffraction. The intermediate compositions belong to the space group A2(1) am as confirmed by Rietveld refinements. Rietveld refinements on all the compositions reveal that the La3+ ion is disordered only in the A site and not in the [Bi2O2](2+) layer. The tilt in the Ti/NbO6 octahedra decreases with increasing x. (C) 2003 Elsevier B.V. All rights reserved.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::307b54179979f8f800fd2b9bb87d8c0c https://doi.org/10.1016/s0254-0584(03)00335-3 Zobrazit plný text záznamu Full Text from ScienceDirect