Abstract
The temperature dependences of the a(T) and c(T) crystal structure parameters for HoB4 and ErB4 at temperatures of 5–300 K are experimentally investigated. Anomalies of these dependences for tetraborides studied at magnetic ordering temperatures were found for HoB4 T N1 = 5.7 K, T N2 = 7.1 K and for ErB4 T N1 = 15.4 K. The regular lattice a lat(T) and c lat(T) contribution to the thermal expansion of the rare-earth tetraborides studied in the present work and in the authors previous works were calculated. The temperature changes in the lattice components of the tetraborides thermal expansion, as well as their heat capacity of previous works of the authors, are considered within the Einstein and Debye approximations. The characteristic temperatures \(\theta _{{\rm Di}}, \theta _{{\rm E}}\) of the examined rare-earth tetraborides were found. A slight decrease in the characteristic temperatures for RB4 tetraborides was observed with an increase in the rare-earth metal atomic number in the Periodic Table, which is conditioned by the predominant effect of the R3+ ion mass on the lattice dynamics of the analyzed borides in comparison with the lanthanide reduction.
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This work was supported by the Ministry of Education and Science of the RF (State Assignment 3.105.2014/K for 2014-2016) and the RFBR (Grant 14-02-31692 \(\hbox {mol}\_\hbox {a}\)).
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Novikov, V.V., Mitroshenkov, N.V., Matovnikov, A.V. et al. Peculiarities of the lattice thermal properties of rare-earth tetraborides. J Therm Anal Calorim 120, 1597–1602 (2015). https://doi.org/10.1007/s10973-015-4475-6
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DOI: https://doi.org/10.1007/s10973-015-4475-6