Abstract
PbBi4ZrxTi4-xO15 (PBZT) ceramics were synthesized for the first time from sol-gel derived powders, and their electrical properties were investigated. The orthorhombic PbBi4Ti4O15 (PBT) structure was maintained in the Zr concentration (x) range up to x=2.0. However, in the range of 0<x≤0.5, 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 (TC) from 554 to 563°C and decreased the relative permittivity at TC from 3003 to 1329 at x=1.0. A remarkable increase in ferroelectric properties was observed at a Zr concentration of x=0.5. 2Pr and 2Ec values at x=0.5 were 2.4μC/cm2 and 18.4kV/cm, respectively, at room temperature, and 9.9μC/cm2 and 28.1kV/cm, respectively, at 120°C, at an electric field of 40kV/cm.
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