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A holmium boride HoB50 polycrystalline sample was synthesised by boron-thermal reduction from the elements at high temperature. The temperature dependencies of the heat capacity Ср(Т) and the unit cell parameters a(T), b(T), c(T) of holmium boride were determined experimentally in the temperature range 2–300 K. In terms of Cp(T) dependence, smooth anomalies were revealed at TС1 max ≈ 6.5 K and TС2 max...