Preparation and properties of rapidly quenched films in the PbO-Nb/sub 2/O/sub 5/ system
Journal Article
·
· Materials Research Bulletin; (USA)
- Government Industrial Research Inst., Nagoya (Japan)
Rapidly quenched films in the PbO-Nb/sub 2/O/sub 5/ system (10 to 66.7 mol% Nb/sub 2/O/sub 5/) were prepared by the use of a twin-roller type apparatus. The rapid quenching of melts in this system resulted in the formation of several new kinds of metastable phases. The films containing 10% Nb/sub 2/O/sub 5/ precipitated PbO solid solution of tetragonal form. In 15% Nb/sub 2/O/sub 5/, crystal phase having a face centered tetragonal structure was produced coexisting with another tetragonal metastable phase. In the compositions with 20 to 40% Nb/sub 2/IO/sub 5/, crystal phase with a defect fluorite structure was obtained as the major product. Beyond 50% Nb/sub 2/O/sub 5/, there was no great difference in the phase constitutions between rapidly quenched films and solid state reacted samples. Annealing of the films at higher temperatures was also characterized by the appearance of metastable phases. The phase change by annealing was accompanied by a sharp increase in the dielectric constant.
- OSTI ID:
- 5266172
- Journal Information:
- Materials Research Bulletin; (USA), Journal Name: Materials Research Bulletin; (USA) Vol. 24:1; ISSN MRBUA; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ANNEALING
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIELECTRIC PROPERTIES
DISPERSIONS
ELECTRICAL PROPERTIES
ENERGY LEVELS
EXCITED STATES
FILMS
HEAT TREATMENTS
HIGH TEMPERATURE
LEAD COMPOUNDS
LEAD OXIDES
METASTABLE STATES
MIXTURES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
QUENCHING
REFRACTORY METAL COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
TETRAGONAL LATTICES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ANNEALING
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIELECTRIC PROPERTIES
DISPERSIONS
ELECTRICAL PROPERTIES
ENERGY LEVELS
EXCITED STATES
FILMS
HEAT TREATMENTS
HIGH TEMPERATURE
LEAD COMPOUNDS
LEAD OXIDES
METASTABLE STATES
MIXTURES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
QUENCHING
REFRACTORY METAL COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
TETRAGONAL LATTICES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS