PbMg_<1/3>Nb_<2/3>O_3-PbTiO_3系傾斜機能セラミックスの誘電率-温度特性の設計

概要

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Functionally graded PMN-PT ceramics, which had a continuously varying graded composition from one surface toward the other of the specimen, were examined with respect to their dielectric property. Specimens were prepared by sintering superposed layers of green compacts of (1- x) PMN-xPT solid solutions with different values of x. The electric permittivity (ε) of single-phase (1- x) PMN-xPT ceramics showed a peak at the Curie temperature, which shifted towards higher temperatures with increasing x. On the other hand, the profile of ε vs temperature (T) for the graded PMN-PT ceramics experienced a linear characteristic. Furthermore, a flat profile was obtained by varying the volume of layers. The relative permittivity was 10000 ± 200 in the temperature range from room temperature to 120℃. In addition, the temperature coefficient of permittivity could be arbitrary adjusted by cutting the specimen diagonally.
社団法人日本セラミックス協会の論文
2002-09-01