EFFECTS OF Y2O3 ON PROPERTIES OF CaCu3Ti4O12 CERAMICS PREPARED BY MOLTEN SALT METHOD
Effect of Y on CCTO Ceramics
DOI:
https://doi.org/10.55766/sujst9694Keywords:
CCTYO ceramics, Density, Dielectric properties, Vickers micro-hardnessAbstract
In this research, the effects of Y2O3 on the properties of CaCu3Ti4O12 ceramics, abbreviated as CCTO, prepared using the molten salt method, were studied. Additionally, the ceramics were referred to as CCTYO with varying amounts of Y2O3, denoted as CaCu3Ti4-xYxO12-x/2, where x ranged from 0.01 to 0.05 by mol. The sintering temperatures were adjusted to be in the range of 1050 - 1080°C. The influence of Y2O3 dopant on the phase structure, microstructure, density, electrical properties and Vickers micro-hardness was investigated. It was found that all XRD patterns of CCTYO ceramics with various Y2O3 doping exhibited phase structures could be matched with a JCPDS file number 75-2188. The grain morphology of CCTYO ceramics appeared as rectangular-like shapes, and increased with increasing sintering temperature. The CCTYO ceramics of all Y2O3 variations have the highest density at a sintering temperature of 1050°C. The dielectric properties of all CCTYO ceramics sintered at 1050°C was measured at a frequency of 1 kHz. It was observed that when 0.01 mol of Y2O3 was added as a dopant, the CCTYO ceramics exhibited the highest dielectric constant of 14100 at room temperature and the lowest dielectric loss of 0.04. Furthermore, the CCTYO ceramics for all Y2O3 variations, sintered at 1050°C, exhibited the highest Vickers micro-hardness of approximately 10 GPa.
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