The structure of Ba3W2O9; an example of face-shared octahedra with tungsten (VI)

Kenneth R Poeppelmeier; A. J. Jacobson; J. M. Longo

doi:10.1016/0025-5408(80)90177-4

The structure of Ba₃W₂O₉; an example of face-shared octahedra with tungsten (VI)

Kenneth R Poeppelmeier, A. J. Jacobson, J. M. Longo

Northwestern University

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

The structure of Ba₃W₂O₉ has been determined from powder x-ray diffraction data and found to be the same as in Cs₃Tl₂Cl₉. Two-thirds of the octahedral sites between hexagonal closest-packed BaO₃ layers (ABAB...) are filled by the tungsten atoms. The enneaoxo W₂O₉ ^6- group represents the first crystal chemistry example of tungsten (VI) in a face-sharing arrangement. Infrared and Raman data are consistent with overall 32 (D₃) site symmetry. Crystallographic and spectroscopic evidence supports a covalent bonding model with oxygen pπ → metal dπ stabilization of this tungsten (VI) phase.

Original language	English
Pages (from-to)	339-345
Number of pages	7
Journal	Materials Research Bulletin
Volume	15
Issue number	3
DOIs	https://doi.org/10.1016/0025-5408(80)90177-4
Publication status	Published - 1980

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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abstract = "The structure of Ba3W2O9 has been determined from powder x-ray diffraction data and found to be the same as in Cs3Tl2Cl9. Two-thirds of the octahedral sites between hexagonal closest-packed BaO3 layers (ABAB...) are filled by the tungsten atoms. The enneaoxo W2O9 6- group represents the first crystal chemistry example of tungsten (VI) in a face-sharing arrangement. Infrared and Raman data are consistent with overall 32 (D3) site symmetry. Crystallographic and spectroscopic evidence supports a covalent bonding model with oxygen pπ → metal dπ stabilization of this tungsten (VI) phase.",

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AB - The structure of Ba3W2O9 has been determined from powder x-ray diffraction data and found to be the same as in Cs3Tl2Cl9. Two-thirds of the octahedral sites between hexagonal closest-packed BaO3 layers (ABAB...) are filled by the tungsten atoms. The enneaoxo W2O9 6- group represents the first crystal chemistry example of tungsten (VI) in a face-sharing arrangement. Infrared and Raman data are consistent with overall 32 (D3) site symmetry. Crystallographic and spectroscopic evidence supports a covalent bonding model with oxygen pπ → metal dπ stabilization of this tungsten (VI) phase.

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