Specific features of the heat capacity and thermal expansion of icosahedral holmium boride HoB50Â at temperatures of 2-300Â K

The dependencies a(T), b(T), c(T) of holmium boride clearly show a pronounced anisotropy of thermal expansion. The anomalies in the temperature changes of the HoB50 unit cell volume at elevated temperatures are analysed within the CEF model described above.