Abstract
The intensities of the I410 and I411 reflections of nine rare-earth hexaborides MB6 (M=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy) are experimentally studied in the temperature range 4.2–300 K. The mean-square displacements of metal and boron atoms are calculated from the temperature dependences of the intensities I410(T) and I411(T). The characteristic temperatures of the metal (θM) and boron (θB) sublattices of rare-earth hexaborides are determined in the Debye approximation. It is found that the characteristic temperatures decrease with an increase in the atomic number of the metal.
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