Abstract
The Ho-Sn phase diagram was established by means of differential thermal, x-ray, and microscopic analyses of 23 as-cast alloys. Seven intermetallics were found to form in the system. Ho5Sn3 melts congruently at 1915°C. The intermetallics Ho5Sn4, Ho11Sn10, Ho4Sn5, HoSn2, Ho2Sn5, HoSn3 form in peritectic reactions at 1720 ±13,1592 ±11,1144 ±11,1114 ±15,509 ±12, and 420 °C, respectively. Compounds Ho5Sn4 and Ho4Sn5 were observed for the first time. The Ho-rich eutectic crystallizes at 1252 ±11°C and contains ≅13 at. % tin. The solid solubility of Sn in Ho is about 2.5 at. % and that of Ho in Sn is negligible. The enthalpy of mixing of liquid Ho-Sn alloys was studied by calorimetric method. The limit enthalpy of dissolution of Ho in Sn was calculated to be-78.4 kJ/mol.
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Bulanova, M.V., Eremenko, V.N., Petjukh, V.M. et al. The Ho-Sn (Holmium-Tin) system. JPE 19, 136–141 (1998). https://doi.org/10.1361/105497198770342599
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DOI: https://doi.org/10.1361/105497198770342599