Grain sizes and dielectric properties of CC(3.1)TO ceramics with various sintering temperature prepared by molten salt method

Abstract

In this research, CaCu_3.1Ti₄O_12.1 ceramics were prepared by molten salt method. The optimum calcinations temperature for obtaining the pure phase was 700 ^oC for 4 h. The calcined powders were ground and pressed and then sintered at 1000, 1025, 1050, 1075 and 1100 ^oC for 4h. The phase of the sintered samples at various sintering temperatures was investigated by X-ray diffraction technique (XRD). The microstructural evolution of the sintered samples was examined by scanning electron microscopy (SEM). The average grain size of samples was calculated by linear interception method. Density of the sintered samples was measured by Archimedes method with distilled water as the fluid medium. Dielectric constant was measured using by a LCR meter at room temperature and 1 kHz frequency. It was found that, all of XRD patterns showed pure phase and could be matched with a JCPDS file number 75-2188. The microstructure indicates a monophase constitution with uniformly packed parallelogram shape in grain. The average grain sizes and density of CC(3.1)TO ceramics were increase with increasing sintering temperature. The dielectric constant of CC(3.1)TO ceramics increase with increasing grain sizes.

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Keywords: CC(3.1)TO ceramics, Molten salt, Dielectric constant