Mechanism of oxidation of (103)-CS structure in the W-O system

Journal Article · Fri Feb 01 04:00:00 EST 1985 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(85)90064-7· OSTI ID:5380165

Sahle, W; Kljavins, J

The reduction of tungsten trioxide crystals by the gaseous buffer equilibration technique and the structural transformations involved have recently been studied by high-resolution transmission electron microscopy (HREM) at this laboratory. During reduction of WO/sub 3/ crystals at about 1270 K, in the interval of oxygen partial pressures from 1.0 x 10/sup -2/ to 2.7 x 10/sup -6/ Pa, (102) crystallographic shear (CS) structures are formed with compositions in the range WO/sub 3-x/, 0 < x less than or equal to 0.07. Further reduction gives rise to the intergrowth of (102)-Cs and (103)-CS structures (1,4), while pure (103)-CS structures in the composition interval of 0.07 less than or equal to x less than or equal to 0.01 are formed at oxygen partial pressures of 4.0 x 10/sup -7/ to 6.0 x 10/sup -8/ Pa. The HREM imaging technique was used to study the reoxidation mechanism of (103)-CS structures.

• Research Organization: Univ. of Stockholm, Sweden
• OSTI ID: 5380165
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 56:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
360205 -- Ceramics
Cermets
&amp; Refractories-- Corrosion &amp; Erosion
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DATA
DISLOCATIONS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
LINE DEFECTS
MICROSCOPY
MONOCRYSTALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REDUCTION
REFRACTORY METAL COMPOUNDS
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
VERY HIGH TEMPERATURE