On a minimum grain size for domain formation in lanthanum-modified lead titanate ferroelectric ceramics

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(87)90135-9· OSTI ID:5485199

Demczyk, B G; Khachaturyan, A G; Thomas, G

When cubic lead titanate, point group m3m, is cooled below its Curie point, it transforms into 100>, becoming tetragonal, point group 4mm. This is the ferroelectric state. In order to relieve the transformation strain, twins (ferroelectric domains) form, with )101) habit. A critical grain size for twinning has also been found using transmission electron microscopy. The experimentally observed minimum grain size (<0.3 ..mu..m) is consistent with values derived from a balance of the cubic to tetragonal elastic strain and twin surface energies. The samples under consideration were lanthanum-modified lead titanate, Pb/sub 0.7/La/sub 0.2/O/sub 3/ + 0.1 PbO, prepared by sintering.

• Research Organization: Dept. of Materials Science and Mineral Engineering, Univ. of California, and Materials and Molecular Research Div., Lawrence Berkeley Lab., Berkeley, CA 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5485199
• Journal Information: Scr. Metall.; (United States), Vol. 21:7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LANTHANUM COMPOUNDS
COOLING
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRICAL PROPERTIES
LEAD COMPOUNDS
TITANATES
CERAMICS
CUBIC LATTICES
CURIE POINT
ELASTICITY
FERROELECTRIC MATERIALS
GRAIN SIZE
SINTERING
STRUCTURAL CHEMICAL ANALYSIS
TETRAGONAL LATTICES
TRANSMISSION ELECTRON MICROSCOPY
TWINNING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
FABRICATION
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SIZE
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
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