ゾル-ゲル粉末から合成したPbBi_4Zr_xTi_<4-x>O_<15>セラミックスの構造評価と電気的特性

概要

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PbBi_4Zr_xTi_<4-x>O_<15>(PBZT) ceramics were synthesized for the first time from sol-gel derived powders, and their electrical properties were investigated. The orthorhombic PbBi_4Ti_4O_<15>(PBT) structure was maintained in the Zr concentration (x) range up to x=2.0. However, in the range of 0<x&lnE0.5, monotonous changes in the lattice parameters were observed as well as the absence of a second phase. PBZT powders and ceramics were prepared by using both a conventional powder-mixing process and a sol-gel technique. The conventional powder-mixing process did not lead to PBZT phase formation under any conditions, even with x=0.5. The substitution of titanium by zirconium increased the Curie temperature (T_c) from 554 to 563℃ and decreased the relative permittivity at T_c from 3003 to 1329 at x=1.0. A remarkable increase in ferroelectric properties was observed at a Zr concentration of x=0.5. 2P_r and 2E_c values at x=0.5 were 2.4 μC/cm^2 and 18.4 kV/cm, respectively, at room temperature, and 9.9 μC/cm^2 and 28.1 kV/cm, respectively, at 120℃, at an electric field of 40 kV/cm.
社団法人日本セラミックス協会の論文
1999-06-01