Fabrication and properties of hot pressed bismuth tungstate
Bi/sub 2/WO/sub 6/ is a synthetic polar material that is a possible candidate for energy conversion and detection systems. Previous research on this material has been concerned with crystal growth and sintering characteristics of polycrystalline compacts. This study involves itself with the fabrication of polycrystalline compacts by hot pressing techniques. Densities approaching theoretical crystal density were achieved by hot pressing at 850/sup 0/C for one hour with pressures exceeding 35 MPa. Before hot pressing, the sintering range was determined by high temperature dilatometry of unfired Bi/sub 2/WO/sub 6/ ceramics. Hot pressed discs were characterized by scanning electron microscopy, differential scanning calorimetry, and x-ray diffraction. Electrical properties were determined by dc resistivity, capacitance, and conductance measurements, ac poling, dc poling, and current-voltage measurements.
- Research Organization:
- Illinois Univ., Urbana (USA)
- DOE Contract Number:
- EY-76-C-02-1198
- OSTI ID:
- 6603982
- Report Number(s):
- COO-1198-1219
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
BISMUTH COMPOUNDS
CHALCOGENIDES
CRYSTAL GROWTH
ELECTRICAL PROPERTIES
FABRICATION
HOT PRESSING
MATERIALS WORKING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
SINTERING
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
VERY HIGH TEMPERATURE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
BISMUTH COMPOUNDS
CHALCOGENIDES
CRYSTAL GROWTH
ELECTRICAL PROPERTIES
FABRICATION
HOT PRESSING
MATERIALS WORKING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
SINTERING
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
VERY HIGH TEMPERATURE