Improvement of the phase diagram for the pseudobinary PbNb{sub 2}O{sub 6}-BaNb{sub 2}O{sub 6} system

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3152588· OSTI ID:21352262

Venet, M; Zabotto, F L; Eiras, J A; Garcia, D ^[1]

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1. Department of Physics, Ferroelectric Ceramics Group, Federal University of Sao Carlos, Sao Carlos, Sao Paulo 13565905 (Brazil)

Characteristics of phase transitions of lead barium niobate compositions around the morphotropic phase boundary were investigated. Using structural characterizations, it was found that the morphotropic phase boundary extends toward a wide composition range, in which both tetragonal (4mm) and orthorhombic (m2m) tungsten bronze phases coexist. In addition, on heating, two phase transitions were observed for all the studied compositions. First, the fraction with m2m symmetry phase transforms into the 4mm symmetry one and, second, the 4mm symmetry phase, which represents the whole material, transforms into the paraelectric phase (4/mmm symmetry). The phase transition temperatures were determined from dielectric characterizations. These results helped to improve the phase diagram of the pseudobinary PbNb{sub 2}O{sub 6}-BaNb{sub 2}O{sub 6} system around the morphotropic phase boundary region.

• OSTI ID: 21352262
• Journal Information: Journal of Applied Physics, Vol. 105, Issue 12; Other Information: DOI: 10.1063/1.3152588; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CERAMICS
FERROELECTRIC MATERIALS
HEATING
LEAD COMPOUNDS
NIOBATES
ORTHORHOMBIC LATTICES
PERMITTIVITY
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PIEZOELECTRICITY
POLARIZATION
SINTERING
TEXTURE
TRANSITION TEMPERATURE
TUNGSTEN BRONZE
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIAGRAMS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELECTRICITY
FABRICATION
INFORMATION
MATERIALS
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ALLOYS