Thermochemical investigations in the systems RE2O3-SeO2. I - Neodymium selenium oxides on the line Nd2O3-SeO2 [German]

摘要

The ternary pure phases on the line Nd2O3-SeO2: Nd2SexO3+2x in the thermodynamically equilibrium have been synthesized by solid state reactions and characterized by X-ray powderdiffration, IR-spectroscopy and DSC-measurements. The existence of a new phase Nd2Se1.5O6 was demonstrated beside the known phases Nd2Se4O11, Nd2Se3,5O10, Nd2Se3O9 and Nd2SeO5. The thermical decomposition properties of the compounds have been determined by total pressure measurements and the thermodynamical data of the compounds have been derived from their decomposition function and C-p-values, which were measured too. The phase diagram and the phase barogram have been established using the result of DSC and total pressure measurements. [References: 15]