Effect of Calcination Temperatures on Phase Formation and Microstructure of Lead Titanate Powders Synthesized via Combustion Technique

Theerachai Bongkarn, Sarawut Thountom, Panadda Sittiketkorn

Abstract


Lead titanate (PbTiO3; PT) powders were sucessfully prepared by a combustion
technique. PT powders were heated at various calcination temperatures, ranging from 500 to
900 ºC, for 2 h at a heating/cooling rate of 5 ºC/min. Powder samples were characterized
using thermogravimetric (TGA), differential thermal analysis (DTA), X-ray diffractrometer
(XRD) and scanning electron microscopy (SEM). The second phases such as PbO, PbO2 and
TiO2 were detected in the powders calcined below 800 ºC. A single perovskite of the PT
powders was found with calcination temperatures above 800 ºC. A lattice parameter c and
c/a ratio increased while, the lattice parameter a decreased with increasing calcination
temperature. The TGA-DTA results corresponded to the XRD investigation. The particle size
tended to increase with increasing calcining temperature.

Key words: combustion technique, lead titanate, phase formation, microstructure, tetragonality


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