Zero Thermal Expansion in PbTiO3-Based Perovskites

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• 作者：Jun Chen ; Xianran Xing ; Ce Sun ; Penghao Hu ; Ranbo Yu ; Xiaowei Wang ; Lihong Li
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：January 30, 2008
• 年：2008
• 卷：130
• 期：4
• 页码：1144 - 1145
• 全文大小：69K
• 年卷期：v.130,no.4(January 30, 2008)
• ISSN：1520-5126

文摘

PbTiO₃-Bi(Zn_1/2Ti_1/2)O₃ and related solid solutions exhibit an unusually negative thermal expansion with considerably enhanced tetragonality and Curie temperature. A zero thermal expansion is found over a wide temperature range of room temperature to 500 C. Direct experimental evidence is given for the fact that the negative thermal expansion of PbTiO₃-based solid solutions is strongly correlated with the temperature dependence of the ferroelectricity, which is a new negative thermal expansion mechanism.