タングステンブロンズ構造Sr_<2-x>Ca_xNaNb_5O_<15>(x=0.1)の無鉛圧電セラミックス材料(<特集>セラミックスインテグレーション)

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This paper reported the development of lead-free Sr_<2-x>Ca_xNaNb_5O_<15> (SCNN, x=0.1) piezoelectric ceramics with tungsten bronze structure that are potentially served as sensors in sensing patches. These ceramics were prepared using the conventional solid-state synthesis method, and their dielectric, ferroelectric and piezoelectric properties were investigated. The dual-stage sintering was used to densify SCNN ceramics, i.e. prefiring at 1240℃ for 6 h and finally firing at 1280-1360℃ for 25 h. The sample sintered at 132O℃ exhibited the maximum density (4.96 g/cm^3) and thus had the maximum dielectric constant (1455) and the Curie temperature (288℃). The spontaneous polarization and the piezoelectric constant of this sample were 7.9 μC/cm^2 118 pC/N, respectively. The electric properties of SCNN were improved by doping with 1 mass% La_2O_3, with the dielectric constant of 1662, the Curie temperature of 298℃, spontaneous polarization of 10.7 μC/cm^2 and the piezoelectric constant of 138 pC/N, respectively. The good piezoelectric properties of the SCNN-based ceramics indicate that they are good candidates for sensor applications.
社団法人日本セラミックス協会の論文
2002-05-01