Synthesis of La_(1-x)Ca_xMnO_3(x = 0 and 0.2) through ultrasonic mixing and its characterisation

摘要

In order to investigate the crystal structure and morphology of perovskite manganite materials, we have been successfully synthesized LaMnO_3 and La_(0,8)Ca_(0,2)MnO_3 systems through ultrasonic mixing method. The application of these materials is the alternative cooler technology beside freon gas using with residual emission gas. Stoichiometric mixture of La_2O_3, MnCO_3, and CaO with more than 95 % purity were be prepared by ultrasonic mixing 40 kHz 60 watts for 30 minutes to result homogen mixtures. The samples were calcinated at 800°C for 1 h and sintered at 1100°C for 3 h. The structure of the samples was examined by X-ray diffractometer (XRD) Phillips and result as single phase of perovskite manganite materials. Morphology was studied using a 5310LV Jeol scanning electron microscope (SEM) that show the same grains of perovskite manganite material. While Ca substituted for La in the sample, the grain size decreases with decreasing the volume of cell units and finally the particle size of La_(0.8)Ca_(0.2)MnO_3 phase decreases.