ABSTRACT This paper presents the effects of calcination time and sintering temperature on the properties of CaCu3Ti4O12. Electroceramic material of CaCu3Ti4O12 was prepared using a modified mechanical alloying technique that covers several processes, which are preparation of raw material, mixing and ball milling for 5 hours, calcination, pellet forming and, sintering. The objective of this modified technique is to enable the calcination and sintering processes to be carried out at a shorter time and lower temperature. The x-ray diffraction (XRD) analysis result shows that a single-phase of CaCu3Ti4O12 was completely formed by calcination at 750°C for 12 hours. Meanwhile, the grain size of a sample sintered at 1050°C for 24 hours is extremely large, in the range of 20--50 μm obtained from field emission scanning electron microscopy (FESEM) images. The dielectric constant value of 14,635 was obtained at 10 kHz by impedance (LCR) meter in the sintered sample at 1050°C. However, the dielectric constant value of samples sintered at 900 and 950°C is quite low, in the range of 52--119.
Digital Object Identifier 10.1109/TUFFC.2007.582
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