Synthesis and caracterization of CCTO (CaCu3Ti4O12)

• Autor(a) principal: Fernandes, Tatiana Sainara Maia
• Data de Publicação: 2011
• Outros Autores: Silva, Marcelo Antonio Santos da, Simão, Sarah Hannahe Costa, Silva, Cléber Cândido da, Sales, Juscelino Chaves, Sombra, Antônio Sérgio Bezerra
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/55893
• topic: Método de sinestesia no estado sólido; Difração de raios - X; Refinamento

The objective of this work is to study the ceramic material CCTO (CaCu3Ti4O12) by X-Ray Diffraction. The CCTO is a material with a giant dielectric constant at room temperature and good temperature stability over a wide temperature and frequency ranges. The preparation method has a great influence on the structure and dielectric properties of this material. The CCTO was prepared by solid state method in a planetary high energy ball milling (Fritsch Pulverisette 5). Stoichiometric quantities of CaCO3 (Aldrich 99%), TiO2 (Merck 99%) and CuO (Analar 98%) were dry milled during 30h with a rotational speed of 370 rpm and then calcined at 1050 ºC for 12h. After, the CCTO was studied by X-ray diffraction (XRD). The refinament showed that the CCTO was formed with 100% mass, the graph of Williamson-Hall showed a homogeneous sample, with a contraction in the crystal lattice and a reasonably small particle size.