Investigation of cacu3ti4o12 precursor by simultaneous tga and dsc analysis in oxygen environment

Abstract

CCTO consist of huge dielectric constant up to 105 at temperature range-173 °C to 326 °C becomes an attraction to investigate the CCTO ceramics. The samples were tested using simultaneous thermogravimetry (TGA) and differential calorimetry (DSC) measurement in dual atmospheric gases condition by flowing nitrogen and oxygen gas. Phase changes of CCTO precursor were analyzed by X-ray diffraction machine. The samples CT900 and CT1000 occur both of mass loss and reabsorption due to oxygen rich environment. The mass loss for both samples CT900 and CT1000 has complete curves of CaCO3 decomposition. Sample CT900 shows incomplete of heat flow changes compare to samples CTNML and CT1000. The result shows that the formation of the CCTO phase structure does not depend on the oxygen gas environment but also requires specific heat of energy and temperature to changes the phase structure. DSC graph shows two magnitudes of heat flow changes for sample CT1000 that are an endothermic at temperature peak points 824 °C and 984 °C.