12688-52-7Relevant articles and documents
Low-temperature thermal properties and features of the phonon spectrum of lutetium tetraboride
Novikov,Mitroshenkov,Matovnikov,Avdashchenko,Morozov,Pavlova,Koltsov
, p. 170 - 174 (2014)
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 Gru?neisen 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.
