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      https://www.ias.ac.in/article/fulltext/pram/086/06/1355-1367

    • Keywords

       

      Monoarsenides; Cauchy relation; anisotropy; Debye temperature; ultrasonic attenuation.

    • Abstract

       

      The present paper deals with the theoretical calculation of mechanical and thermophysical properties of rare-earth monoarsenides, XAs (X: Np, Pu, Th and U) using elastic constants as the input parameters. These second- and third-order elastic constants (SOECs and TOECs) are determinedin the temperature range 100–500K using Coulomb and Born–Mayer potential upto second nearest neighbours. In order to provide the link between mechanical and dynamical behaviour of crystals, parameters such as Young’s modulus, bulk modulus, Poisson’s ratio etc. are also calculated.In addition, the Cauchy relationship is obeyed by the chosen monoarsenides and are fairly anisotropic, which results in the measurement of longitudinal and shear wave velocities along $\langle100 \rangle$, $\langle110\rangle$ and $\langle 111\rangle$ directions. The toughness/fracture $(G/BT)$ ratio is greater than 0.60, which implies that XAs compounds are brittle at room temperature. Further, the Debye temperature is computed using Debye average velocity as the input parameter. It helps in the characterization of lattice vibrations of a solid. In this work, ultrasonic attenuation due to phonon–phonon interaction$\alpha/f^2_{\rm p−p}$ and thermoelastic loss $\alpha/f ^{2}$th are computed for XAs from 100 to 500K using Mason’s theory. It further helps in evaluating the microstructural properties of the chosen materials. The obtained results indicate that XAs is mechanically stable and are compared with data availablein the literature.

    • Author Affiliations

       

      BHALLA VYOMA1 2 SINGH DEVRAJ2 JAIN S K3 KUMAR RAJ4

      1. Amity Institute of Applied Sciences, Amity University, Noida 201 303, India
      2. Department of Applied Physics, Amity School of Engineering and Technology, Bijwasan, New Delhi 110 061, India
      3. Department of Applied Sciences, The NORTHCAP University, Sector-234, Gurgaon 122 017, India
      4. Department of Physics, Gurgaon Institute of Technology and Management, Gurgaon 122 413, India
    • Dates

       
  • Pramana – Journal of Physics | News

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