Dielectric properties of LCTO ceramics with various sintering temperature

Abstract

In this research, La2/3Cu3Ti4O12 (LCTO) ceramics were prepared by the solid-state mixed oxide method. The optimum calcinations temperature for obtaining the pure phase was 950 oC for 4 h. The calcined powders were ground and pressed into cylindrical pellets with 10 mm in diameter and 2-3 mm in thickness under a pressure of 50 MPa. The pellets were then sintered at 1000, 1025, 1050 and 1075 oC for 6 h with a heating rate of 5 oC/min. Phase evolution of the ceramics samples after sintered at various temperatures were investigated by X-ray diffraction technique (XRD). The microstructural evolution of the sintered samples was examined by scanning electron microscopy (SEM). Density of the sintered samples was measured by Archimedes???s method with distilled water as the fluid medium. And dielectric properties were examined using a LCR meter at 1, 10, 100, 500 kHz and 1 MHz. It was found that, all of XRD patterns showed pure phase. The microstructure indicates a monophase constitution with uniformly packed parallelogram shape in grain. The density increased with increasing sintering temperature. The high dielectric constant and the lowest loss of dielectric were found in LCTO ceramic sintered at 1075 oC when monitored at frequency 100 kHz.Keywords: LCTO ceramic, Sintering temperature, Dielectric properties