Preparation and characterizations of Ba0.8Ca0.2TiO3 by complex polymerization method (CPM)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Ba0.8Ca0.2TiO3 (BCT) was prepared by the complex polymerization method (CPM) using Ba0.8Ca0.2CO3 and [Ti[OCH(CH3)(2)](4) as starting materials. The powders were crystallized at several temperatures from 400 to 1200 degrees C using different times (from I to 8 h). The phase evolution and the physical properties were characterized by X-ray diffraction, Raman and IR spectroscopy. Such results indicate that the precursor Ba0.8Ca0.2CO3 used in the synthesis of Ba0.8Ca0.2TiO3 promotes an effective complexation of the ions Ca2+ in the matrix of BaTiO3. After heat treatment for 2 h at 600 degrees C the phase BCT was obtained with absence of the CaTiO3 or BaCO3 phases. The CPM is an efficient method in the synthesis of the BCT, using small reaction time and low temperature and cost for the preparation of these powders. (C) 2007 Elsevier B.V. All rights reserved.