Stereochemical influence of the Bi/sup 3 +/ lone pair of electrons on polymorphism in Bi/sub 2/WO/sub 6/
This paper explains how the Bi/sup 3 +/ lone pair exerts stereochemical effects on the structures of three Bi/sub 2/WO/sub 6/ polymorphs, i.e., the low-temperature form (Bi/sub 2/WO/sub 6/(1), orthorhombic), the intermediate form (Bi/sub 2/WO/sub 6/(i), orthorhombic), and the high-temperature modification (Bi/sub 2/WO/sub 6/(h), monoclinic); all their structures consist of alternating Bi/sub 2/O/sub 2/ layers and WO/sub 4/ layers. The monoclinic deformation of Bi/sub 2/WO/sub 6/(h) is explained by assuming appreciable repulsion between two facing lone pairs, each of which belongs to neighboring Bi/sub 2/O/sub 2/ layers, in a hypothetical transient state with the La/sub 2/MoO/sub 6/-related structure under the Bi/sub 2/WO/sub 6/(i) ..-->.. Bi/sub 2/WO/sub 6/ (h) transition. The polymorphism of Bi/sub 2/MoO/sub 6/, which has a Bi/sub 2/WO/sub 6/ (1)-related structure in a koechlinite phase, is also discussed on the basis of the stereochemistry of the Bi/sup 3 +/ lone pair.
- Research Organization:
- National Institute for Research in Inorganic Materials, 1-1 Namiki, Sakura-mura, Niihari-gun, Ibaraki
- OSTI ID:
- 5105550
- Journal Information:
- Mater. Res. Bull.; (United States), Vol. 10:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH TUNGSTATES
PHASE TRANSFORMATIONS
STEREOCHEMISTRY
CRYSTALLIZATION
DEFORMATION
ELECTRON SPECTRA
ELECTRONS
LANTHANUM OXIDES
LAYERS
MOLYBDENUM OXIDES
PHASE STUDIES
TEMPERATURE DEPENDENCE
TRANSIENTS
BISMUTH COMPOUNDS
CHALCOGENIDES
ELEMENTARY PARTICLES
FERMIONS
LANTHANUM COMPOUNDS
LEPTONS
MOLYBDENUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SPECTRA
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
360602* - Other Materials- Structure & Phase Studies