Domain structure of lanthanum modified lead titanate ceramics
The domain configurations in lanthanum modified lead titanate ferroelectric ceramics have been studied by transmission electron microscopy, in both the conventional and analytical modes. Results indicate a preponderance of (110), twin related 90/sup 0/ domains of equilibrium width approximately 400 A. This value is independent of grain size above a critical value and is consistent with values derived from consideration of elastic strain energy. Below this critical value (approximately 400 A), single domain grains are found. A domain wall energy of 10 ergs/cm/sup 2/ was calculated based on this observation. Such domains also occasionally display multiple twinning, also among (110). In addition, (100), 180/sup 0/ domains are found, which display crystallographic misorientation of less than 0.5/sup 0/. The reversibility and observed microstructure of the paraelectric to ferroelectric phase transformation strongly resembles that observed in martensite.
- Research Organization:
- California Univ., Berkeley (USA). Dept. of Materials Science and Mineral Engineering; Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5743232
- Report Number(s):
- LBL-20847; ON: DE86011312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
ALLOYS
CRYSTAL STRUCTURE
DOMAIN STRUCTURE
ELECTRON MICROSCOPY
FERROELECTRIC MATERIALS
GRAIN SIZE
LANTHANUM ADDITIONS
LANTHANUM ALLOYS
LEAD COMPOUNDS
MICROSCOPY
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SIZE
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING