Abstract
Abstract The pure ternary phases on the line Sm2O3-SeO2: Sm2SexO3+2x in thermodynamical equilibrium have been synthesizied by solid state reactions and characterized by X-ray powder diffraction, IR spectroscopy and DSC measurements. The existence of two new phases Sm2Se1,5O6 and Sm2Se4O11 was demonstrated besides the known phases Sm2Se3,5O10, Sm2Se3O9 and Sm2SeO5. The thermal decomposition properties of all compounds have been determined by total pressure measurements and the thermodynamical data of the compounds have been derived from their decomposition function and Cp-values. The phase diagram and the phase barogram have been estabilished using the results of DSC and total pressure measurements.
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