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      • KCI등재

        Effect of temperature on elastic, mechanical and thermophysical properties of VNx (0.76 ≤ x ≤ 1.00) epitaxial layers

        Rai Sachin,Prajapati Aadesh K.,Yadawa Pramod K. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.1

        The efect of temperature on the elastic, thermophysical and mechanical properties of VNx (0.76≤x≤1.00) epitaxial layers has been investigated using Coulomb and Born–Mayer potentials approach up to second nearest neighbor. The elastic constants and its allied properties (Bulk, Shear, Poisson's ratio and Young’s modulus) are analyzed to provide insights into the mechanical behavior of VNx (0.76≤x≤1.00) transition-metal nitrides using second-order elastic constants (SOECs). SOECs are used to measure the temperature deviation of ultrasonic velocities along the crystal’s z axis. The temperature variation of Debye average velocity and thermal relaxation time are calculated along same orientation. Thermal conductivity has been observed to be the main contributing factor to the temperature-dependent behavior of ultrasonic attenuations with phonon–phonon interaction. Depending on G/B ratios, the nitride groups are attributed to brittle and ductile behavior in the future. Including all epitaxial layers, the estimated melting temperatures are in better agreement with those calculated with B and C11 and have highest strength and highest harness. Transition metal nitrides have unusual chemical and physical properties, which are commonly used in industrial felds that require working at temperatures.

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