TIME RESOLVED X-RAY-DIFFRACTION OF THE THERMAL-DECOMPOSITION OF CDCO3 POWDERS USING SYNCHROTRON RADIATION

Time resolved X-ray diffraction (TRXD) is shown to be a viable in situ method to quantitatively study solid-state reactions and phase transmissions. To demonstrate TRXD, the analysis of time-dependent X-ray diffraction shapes are reported for the isothermal decomposition of CdCO3 powders as a function of temperature. Growth nuclei, stacking faults, disorder, and the influence of temperature during reaction are observed and discussed. Rate laws and activation energies are found for particle growth during reaction and sintering. The formation of CdO from CdCO3 is observed to proceed through several stages from nucleation to the final product.