TRANSFORMATION OF CERIUM(III) HYDROXYCARBONATE INTO CERIA .2. EXPERIMENTAL-STUDY OF THE GROWTH-RATE

The variation of the specific rate of growth of ceria from cerium(III) hydroxycarbonate through a solid-gas reaction involving oxygen has be en determined using an experimental method which consisted of modifyin g one of the chemical stresses (a partial pressure) during an experime nt, whilst keeping the other partial pressures constant. The specific rate of growth and nucleation of ceria previously obtained from Mampel 's model were confirmed. Another application was to ensure that, under the experimental conditions of the study, nucleation and growth of ce ria from the solid-gas reaction were the only processes to be taken in to account in the mass balance of the transformation.