Constant transformation rate thermal analysis of HGdP2O7·3H2O

摘要: The aim of this work is the optimization preparation anhydrous gadolinium hydrogen phosphate with good fluorescence properties. products obtained by dehydration trihydrate depend on conditions chosen for thermal treatment. For reason, was followed Constant Rate Thermal Analysis whilst strictly controlling water vapour pressure above sample. Intermediate samples, during were characterised IR spectroscopy and X-ray diffraction. It has thus been shown that pathway taken depends sample in region from 10-2to 5 mbar. Under lowest (5·10-3mbar), elimination crystallization carried out a continuous way produces quasi-amorphous intermediate. higher (5 mbar), well crystallized intermediate are obtained. results suggest contains zeolitic which confirms prior structural study.