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Effect of the Phase Transformation on the Fracture Behavior of BaTiO 3
Author(s) -
POHANKA R. C.,
FREIMAN S. W.,
BENDER B. A.
Publication year - 1978
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1978.tb09234.x
Subject(s) - fracture (geology) , materials science , fracture mechanics , ferroelectricity , grain size , composite material , stress (linguistics) , phase (matter) , deformation (meteorology) , mineralogy , dielectric , chemistry , linguistics , philosophy , optoelectronics , organic chemistry
The fracture energy of BaTiO 3 increased with increasing grain size at 25°C in the ferroelectric 4 mm symmetry state and remained constant at 150°C in the paraelectric m 3 m state. In general, observed flaw sizes agreed with those predicted from fracture mechanics equations. The fracture energy measurements combined with previously reported strength measurements were analyzed in terms of fracture mechanics principles to determine the effect of internal stresses on fracture. The analysis showed that the effect of internal stress on fracture for a given flaw size can be determined from a combination of fracture energy and strength measurements at two temperatures. The increase in fracture energy with grain size in the ferroelectric state is attributed to ferroelastic twin formation and wall motion.