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Elastic constants of MoSi2 and WSi2 single crystals

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Abstract

Single crystals of MoSi2 and WSi2 with a body-centred-tetragonal C 1 1b structure were fabricated using a floating-zone method. The elastic wave velocity was measured for samples with various orientations using a simple pulse echo method at room temperature, and six elastic stiffness constantsc ij were calculated. The stiffness constants were a little higher for WSi2 than for MoSi2.c 11 andc 33 of these compounds were approximately equal toc 11 of tungsten and molybdenum, respectively, althoughc ij (ij) was a little higher for these compounds than for molybdenum and tungsten. Young's modulus 1/s 11 was the highest in the <0 0 1> direction, and the lowest in the <1 0 0> direction. The shear modulus 1/s 66 was high on the {0 0 1} plane and independent of shear direction. It was generally low on the close-packed {1 1 0} plane and largely dependent on shear direction. The elastic constants for the polycrystalline materials were estimated fromc ij ands ij . Poisson's ratiov was 0.15 for MoSi2 and for WSi2, and these values were much lower than for ordinary metals and alloys. The Debye temperature θD was estimated using the elastic-wave velocity of the polycrystalline materials via the elastic constants such as Young's modulus and shear modulus: it was 759 K for MoSi2 and 625 K for WSi2.

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Nakamura, M., Matsumoto, S. & Hirano, T. Elastic constants of MoSi2 and WSi2 single crystals. J Mater Sci 25, 3309–3313 (1990). https://doi.org/10.1007/BF00587691

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Keywords

  • Tungsten
  • Molybdenum
  • Shear Modulus
  • Wave Velocity
  • Elastic Constant