Abstract
This paper presents the results of an experimental study of the temperature dependencies of the heat capacity and the lattice parameters of terbium tetraboride (TbB4) measured in a temperature range of 2–300 K. This study reveals the anomalies of the above characteristics of TbB4 at the temperatures of the corresponding magnetic phase transitions (Neel points) TN1 = 44 K and TN2 = 24 K. The transitions of TbB4 from the tetragonal crystalline structure into the orthorhombic one at temperatures below TN1 were identified. Within our experimental accuracy, no structural transition into the orthorhombic symmetry at temperatures above 80 K was observed. The individual temperature variations of lattice-related and magnetically induced components of the measured properties of TbB4 are extracted using the data for the diamagnetic LuB4. As a result, separate contributions of lattice and magnetic subsystems of TbB4 are determined.
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