For the first time, we determine the modulus of elasticity (Young’s modulus), the shear modulus, and the coefficient of transverse deformation (Poisson’s ratio) for hot-pressed dodecaborides by using the basic thermal characteristics of the dodecaborides of rare-earth metals and zirconium YB12, TbB12, DyB12, HoB12, ErB12, TmB12, YbB12, LuB12, and ZrB12 and the experimental methods of static and dynamic investigations. The numerical and experimental values of the mechanical parameters coincide. The modulus of elasticity of dodecaborides is approximately twice smaller than for pure boron and does not increase, as theoretically predicted, in the sequence MeB4 → MeB6 → MeB12. This fact can be explained by the structural features of the crystal lattice of dodecaboride phases, the lengths of the B–B, Me–B, and Me–Me bonds, and the forces of interaction between the atoms in these phases.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 51, No. 4, pp. 125–130, July–August, 2015.
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Odintsov, V.V., Korin’, O.V. Influence of the Crystalline Structure on the Mechanical Properties of Dodecaborides of Rare-Earth Metals and Zirconium. Mater Sci 51, 576–582 (2016). https://doi.org/10.1007/s11003-016-9878-4
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DOI: https://doi.org/10.1007/s11003-016-9878-4