TITLE

Anelastic anomalies and negative Poisson’s ratio in tetragonal BaTiO3 ceramics

AUTHOR(S)
Dong, Liang; Stone, Donald S.; Lakes, Roderic S.
PUB. DATE
April 2010
SOURCE
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p141904
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Anelastic anomalies (sharp variations in modulus and damping with temperature) were observed in tetragonal BaTiO3 via broadband viscoelastic spectroscopy after aging at 50 °C for 15 h. The effect was most pronounced under electrical short circuit condition, at low frequency and under small excitation strain (10-6). Softening in bulk modulus and negative Poisson’s ratio were observed near 60 °C. Effects are attributed to an oxygen vacancy mechanism. A relaxational model cannot account for sharp response at smaller strains. Heterogeneity of negative stiffness is considered as a cause.
ACCESSION #
49071264

 

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