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Viscoelastic sigmoid anomalies in BaZrO3–BaTiO3 near phase transformations due to negative stiffness heterogeneity

Published online by Cambridge University Press:  01 June 2011

Liang Dong ,
Donald S. Stone  and
Roderic S. Lakes
Liang Dong
Affiliation:
Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706-1687
Donald S. Stone
Affiliation:
Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706-1687
Roderic S. Lakes*
Affiliation:
Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706-1687; and Engineering Mechanics Program, University of Wisconsin, Madison, Wisconsin 53706-1687; and Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706-1687
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

BaZrO3–BaTiO3 ceramics exhibit a shift in transformation temperatures as revealed by dielectric and viscoelastic spectroscopy; a phase diagram has been established. Sigmoid anomalies in Poisson’s ratio and bulk modulus during the ferroelastic transitions were observed in doped materials, which are not predicted by standard theories for phase transformations. “Hashin–Shtrikman” composite model with negative stiffness heterogeneity can well explain this phenomenon. Negative stiffness heterogeneity is considered to be caused by the strained BaTiO3 unit cells in the vicinity of BaZrO3-rich zones under the perturbation of lattice reconstruction.

Keywords

ViscoelasticityCeramicComposite
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 11 , 14 June 2011 , pp. 1446 - 1452
Copyright
Copyright © Materials Research Society 2011

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References

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