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Cross section Bi/sub 2/WO/sub 6/-Bi/sub 2/MoO/sub 6/ of the system Bi/sub 2/O/sub 3/-MoO/sub 3/-WO/sub 3/ and physical properties of the crystalline phases

Journal Article · · Inorg. Mater. (Engl. Transl.); (United States)
OSTI ID:5975107
; ;

The authors have studied the phase diagram of the cross section Bi/sub 2/WO/sub 6/-Bi/sub 2/MoO/sub 6/ of the ternary system Bi/sub 2/O/sub 3/-MoO/sub 3/-WO/sub 3/, which has wide regions of solid solutions with various structures: polar orthorhombic, stable at low temperatures over the whole range of compositions (the ..gamma.. phase); monoclinic with symmetry C2/m (phase M in solid solutions based on high-temperature modification of Bi/sub 2/WO/sub 6/); monoclinic with symmetry P2/sub 1//c (phase ..gamma..' in solid solutions based on high-temperature phase of Bi/sub 2/MoO/sub 6/). The phase transitions ..gamma.. equivalent to M and ..gamma.. equivalent to ..gamma..' are reversible, but the latter is very slow in pure bismuth molybdate. Both these transitions can be regarded as phase transitions of a special type - reconstructive pyroelectric transitions. Solid solutions with orthorhombic structure have high anionic conductivity characteristic of superionic conductors.

Research Organization:
M.V. Lomonosov State Univ., Moscow, USSR
OSTI ID:
5975107
Journal Information:
Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 22:7; ISSN INOMA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
BISMUTH COMPOUNDS
BISMUTH OXIDES
BISMUTH TUNGSTATES
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIAGRAMS
DIFFRACTION
ELECTRICAL PROPERTIES
LATTICE PARAMETERS
MOLYBDATES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MONOCLINIC LATTICES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCATTERING
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
X-RAY DIFFRACTION