Title: Synthesis of PLSnZT ceramics with large displacement constants via a sol-gel colloidal process

Authors: Roxana Popescu, M. Popescu, Mioara Piticescu, Aurelia Meghea

Addresses: Research Institute for Nonferrous & Rare Metals, 102 Biruintei, Bucharest 2, Romania. University PLITEHNICA, Bucharest, Romania. National Research Institute for Materials Science Bucharest, Romania

Abstract: The PLSnZT powders were obtained from soluble peroxide precursors of Ti(IV) and Zr(IV) by precipitation with lead nitrate, lanthanum nitrate and tin chloride solutions. The precipitation of Pb(II), Ti(IV) and Zr(IV) from solution in pseudobinar systems was studied as a function of pH and temperature. The structural evolution of powders was studied using XRD. The powders were pressed, sintered, coated with silver paste and poled in silicon oil at high voltage. The density, contraction, electrical permitivity ε ₃₃ and displacement constants d₃₁ were determined as a function of composition and thermal treatment temperature. The same values were measured for the material with the same composition obtained in the classical ceramic route by solid-state reaction. The density (8.l g/cm^-3), relative electrical permitivity (500) and d₃₁ (16.10^-12 m.V^-1) obtained by the sol-gel colloidal route at a sintering temperature of 1100°C were 30-40% higher comparing with the same constants in the classical route at a sintering temperature of 1250-1300°C.

Keywords: PLSnZT ceramics; sol-gel colloidal process.

DOI: 10.1504/IJMPT.2000.001252

International Journal of Materials and Product Technology, 2000 Vol.15 No.3/4/5, pp.260-269

Published online: 01 Jul 2003 *

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