Add time:07/27/2019         Source:sciencedirect.com

The coefficients of thermal expansion to the c axis (α‖, α⊥) were measured for lutetium tetraboride over the temperature range 4.2–300 K. The heat capacity data for lutetium tetraboride were used for the calculation of tetraboride phonon spectrum moments and also for the development of a simplified tetraboride spectrum model. The use of the heat capacity and thermal expansion data allowed the temperature changes of the Grüneisen parameters Γ, Γ‖, Γ⊥ for tetraboride to be calculated.As a result of the approximation of Γ⊥(T), Γ ‖(T) temperature dependencies in accordance with the chosen phonon spectrum model have been found: the anomalies of Γ⊥(T), Γ‖(T) are at about 25 K and then drop at lower temperatures due to the Einstein vibrations of boron sublattices.

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