Role of oxygen on the phase stability and microstructure evolution of CaCu3Ti4O12 ceramics

Autor(es)

Felix, Anderson A. ; Bezzon, Vinicius D. N. ; Orlandi, Marcelo O. ; Vengust, Damjan ; Spreitzer, Matjaz ; Longo, Elson ; Suvorov, Danilo ; Varela, Jose A.

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 37, n. 1, p. 129-136, JAN 2017.
• Citações Web of Science: 20

Resumo

Phase stability and microstructure evolution of polycrystalline CaCu3Ti4O12 (CCTO) ceramics were studied by controlling the partial pressure of oxygen (from a poor to an oxygen rich atmosphere) during the sintering process at high temperatures. The samples were analyzed by X-ray powder diffraction, scanning electron microscopy and X-ray energy dispersive spectroscopy. Our results show that the oxygen partial pressure during the sintering process is an important parameter that controls the phase stability, non-stoichiometry, and decomposition process of the CCTO phase as well as the densification and grain growth mechanisms on these polycrystalline ceramics. These results provided us further insight into the important role of copper reduction and copper/oxygen diffusion on the crystalline structure and morphological characteristics of polycrystalline CCTO ceramics. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/00367-6 - Estudo das Propriedades de Filmes Nanoestruturados de CaCu3Ti4O12
• Beneficiário: Anderson André Felix
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/14647-6 - Sensores de gás a base de óxidos semicondutores do tipo-p: estudos avançados in-situ e operando
• Beneficiário: Anderson André Felix
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 12/51195-3 - Modeling effects of sensor response of semiconducting oxide with functionalized nanoparticles
• Beneficiário: José Arana Varela
• Modalidade de apoio: Auxílio à Pesquisa - Regular