Add time:07/22/2019         Source:sciencedirect.com

The data in the literature relevant to the rare earth antimonide phase diagrams and the crystallochemical and thermodynamic properties of the rare earth antimonides are summarized. The data obtained in an investigation of Dy-Sb compounds are reported. This investigation was performed using X-ray and metallographic analyses and calorimetric measurements of the heats of formation. The values of ΔHform (kJ (g atom)−1 ±2.0) for the following compounds were obtained for the reaction in the solid state at 300 K (the crystal structure data have also been confirmed): Dy5Sb3 (hP16-Mn5Si3-type),−105.5; Dy4Sb3 (cI28-anti-Th3P4-type), −111.5; DySb (cF8-NaCl-type), −114. These data, together with those relevant to the other rare earth antimonides, are discussed and their trends are in good agreement with the relationships proposed by Gschneidner. The experimental data are in agreement with those computed according to Miedema's model and, in the case of the rare-earth-rich alloys, also agree with those calculated according to Kubaschewski's suggestion based on the effective coordination numbers.

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