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

Dong, Liang; Stone, Donald S.; Lakes, Roderic S.
April 2010
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p141904
Academic Journal
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.


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