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

Journal Article · Wed Dec 31 23:00:00 EST 1986 · 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), Journal Name: Scr. Metall.; (United States) Vol. 21:7; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
&amp; Refractories-- Preparation &amp; Fabrication
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
360204 -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
CERAMICS
COOLING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CUBIC LATTICES
CURIE POINT
ELASTICITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FABRICATION
FERROELECTRIC MATERIALS
GRAIN SIZE
LANTHANUM COMPOUNDS
LEAD COMPOUNDS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SINTERING
SIZE
STRUCTURAL CHEMICAL ANALYSIS
TENSILE PROPERTIES
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TRANSMISSION ELECTRON MICROSCOPY
TWINNING