Viscoelastic sigmoid anomalies in BaZrO_3-BaTiO3 near phase transformations due to negative stiffness heterogeneity

Liang Dong; Donald S. Stone; Roderic S. Lakes

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Viscoelastic sigmoid anomalies in BaZrO_3-BaTiO3 near phase transformations due to negative stiffness heterogeneity

机译：负刚度异质性导致BaZrO_3-BaTiO3近相变中的粘弹性乙状结肠异常

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BaZrO_3-BaTiO_3 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 BaTiO_3 unit cells in the vicinity of BaZrO_3-rich zones under the perturbation of lattice reconstruction.

机译：介电和粘弹性光谱表明，BaZrO_3-BaTiO_3陶瓷的转变温度发生了变化。相图已建立。在掺杂材料中观察到铁弹性转变期间的泊松比和体积模量呈S形异常，这是标准理论无法预测的。具有负刚度异质性的“ Hashin-Shtrikman”复合模型可以很好地解释这种现象。负刚度异质性被认为是由晶格重构扰动下富含BaZrO_3的区域附近的应变BaTiO_3晶胞引起的。

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《Journal of Materials Research》 |2011年第11期|p.1446-1452|共7页
作者
Liang Dong; Donald S. Stone; Roderic S. Lakes;
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作者单位

Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706-1687;

Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706-1687;

Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706-1687 Engineering Mechanics Program, University of Wisconsin, Madison, Wisconsin 53706-1687 Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706-1687;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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Viscoelastic sigmoid anomalies in BaZrO_3-BaTiO3 near phase transformations due to negative stiffness heterogeneity

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