PREPARATION TECHNOLOGY OF ELECTRONIC CERA MIC BATIO3 POWDER IN LIQUID-PHASE .2. STUDIES ON THE THERMAL-DECOMPOSITION REACTION-KINETICS OF PRECURSOR BATIO(C2O4)(2)CENTER-DOT-4H(2)O

The kinetic parameters of the three steps of thermal decomposition of the BaTiO(C2O4)(2) . 4H(2)O are calculated according to the Broido' s linearized simple graphical procedure, It is shown that three-step-rea ction orders are 2,2,0; the activation energies are 96.8, 165.1, 172.2 kJ/mol and that the frequency factors are 1.03 X 10(11), 5.64 X 10(8) , 2.63 X 10(6) s(-1), respectively, The conditions of the process of t hermal treatment are optimized according to the kinetic parameters. Th e powder obtained are ultrafine BaTiO3 with a high purity.