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The temperature dependence of heat capacity С р (Т) of an erbium tetraboride sample, synthesised by the borothermal reduction of metal from oxide in a vacuum, is researched by the absolute adiabatic calorimetry method. The transition of the tetraboride into an antiferromagnetic state at T N =15.1K is revealed on the С р (Т) curve by a sharp maximum. The values of ErB 4...