Pembentukan Fasa Co3O4 Dengan Metoda Dekomposisi CoCO3 Menggunakan Sinar Diffraksi

Experiments have been carried out to obtain the decomposition of cobalt carbonate cobalt oxide to be used as raw material for the manufacture of calcium cobalt oxide thermoelectric materials. The experiments were performed by heating cobalt carbonate powder material (CoCO3) from Kanto Chemical with a temperature of 1000°C. Heating aims to obtain Co3O4 phase. Co3O4 phase is what will be used in the manufacture of thermoelectric materials based on the phase diagram of the system Ca-Co-O. The results of X-ray diffraction CoCO3 materials are heated to 1000°C showed that Co3O4 phase has been formed. Analysis quantitative diffraction pattern shows the diffraction peaks are the property throughout the Co3O4 phase. The crystal structure of Co3O4 is Face Centered Cubic (FCC) with space group F d -3 m. Lattice parameters of the diffraction pattern is the result of smoothing a = 8.0838 Å.

Effects of Sintering Temperature on Phase, Physical Properties and Microstructure of Ca3Co4O9 Ceramic

This study investigated the effects of sintering temperature on phase, physical properties and microstructure of calcium cobalt oxide (Ca3Co4O9 or CCO) ceramic. CCO powder was prepared with using the mixed oxide method and calcined at 750°C for 24 h. The ceramics were prepared by sintering the powder at 900, 950, 1000 and 1050°C under a normal air atmosphere for 24 h. A maximum density of 4.02 g/cm3 (~92% relative density) with 12% linear shrinkage was obtained in the sample sintered at 1000°C. XRD patterns of the CCO ceramics indicated pure phase with no detected impurity. SEM images of the ceramics showed plate-like shaped grains. The average grain size value gradually increased as the sintering temperature increased, and reached a maximum value of 8.95 mm at the sintering temperature of 1000°C. The deviation from stoichiometric composition for the samples sintered at low sintering temperatures may be due to the low sample density which in turn affected the EDS analysis results.