Phase transitions and the morphotropical range in (Pb/sub 1-x/Ba/sub x/)/sub 2/NaNb/sub 5/O/sub 15/ solid solutions with the tetragonal tungsten-bronze structure

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6317735

Lopatin, S S; Medvedev, B S

Phase transitions in the solid solutions ((Pb/sub 1-x/Ba/sub x/)/sub 2/NaNb/sub 5/O/sub 15/) with tetragonal tungsten-bronze structure are studied and the subsolidus phase diagram is constructed. It was established that the two-phase region in the equilibrium phase diagram is caused by the decomposition of the solid solution to the paraelectric phase. The width of the morphotropic range is determined by the technological inhomogeneities in the ceramic composition as well as the depth of the decomposition of the solid solutions. The crystallographic orientation of the polar direction in the solid solutions affects the nature of the anisotropy of the thermal expansion and dielectric constant of the textures.

• Research Organization: M.A. Suslov Rostov State Univ. (USSR)
• OSTI ID: 6317735
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Vol. 23:7; Other Information: Translated from Izv. Akad. Nauk SSSR, Neorg. Mater.; 23: No. 7, 1186-1191(Jul 1987)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
LEAD OXIDES
NIOBIUM OXIDES
SODIUM OXIDES
DIELECTRIC PROPERTIES
GRAIN ORIENTATION
PHASE DIAGRAMS
SINTERING
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIAGRAMS
DIFFRACTION
DISPERSIONS
ELECTRICAL PROPERTIES
FABRICATION
LEAD COMPOUNDS
MICROSTRUCTURE
MIXTURES
NIOBIUM COMPOUNDS
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties