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The elastic, acoustic and mechanical properties of the hexagonal AlB₂-type intermetallic NdCuGe ternary compound have been studied along unique axis at room temperature. The second- and third order elastic constants have been calculated for NdCuGe compound using Lennard-Jones potential model. The temperature variation of the ultrasonic velocities is evaluated along different angles with unique axis of the crystal using the second order elastic constants. Temperature variation of the thermal relaxation time and Debye average velocities is also calculated along the same orientation. The temperature dependency of the acoustic properties is discussed in correlation with elastic, thermal and electrical properties. It has been found that the thermal conductivity is the main contributor to the behaviour of ultrasonic attenuation as a function of temperature and the responsible cause of attenuation is phonon-phonon interaction. The mechanical properties of NdCuGe intermetallic compound at low temperature are better than at room temperature, because at low temperature it has low ultrasonic velocity and ultrasonic attenuation.

Keywords

Elastic Properties, Thermal Conductivity, Acoustic Properties, Ternary Intermetallic Compounds.

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References

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Theoretical investigation on the effect of pressure on mechanical, thermo-physical and ultrasonic properties of La2CO3

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Authors

Prashant Srivastav ¹, Vivek Chaurasiya ¹, Aadesh Kumar Prajapati ¹, Pramod Kumar Yadawa ¹

Affiliations
1 Department of Physics, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research, Veer Bahadur Singh Purvanchal University, Jaunpur-222003, IN

Source

Journal of Pure and Applied Ultrasonics, Vol 45, No 3-4 (2023), Pagination: 79-87

Abstract

La2CO3 is an intermetallic with hexagonal closed packed structure has been investigated for the transmission of acoustic wave in the 0 to 25 GPa operating pressure by using non-destructive testing method. For this, the Lennard-Jones interaction potential approach has been used to estimate the higher order elastic coefficients (SOECs and TOECs). The second and third order elastic properties for this material are computed using this model. Other elastic moduli, including bulk, Young's, and shear moduli as well as mechanical properties like hardness, melting temperature have been determined for La2CO3 with the aid of SOECs and Voigt-Reuss-Hill (VRH) approximations. Later, using SOECs and La2CO3 density in the same pressure range, three orientation dependent acoustic velocities that include Debye average velocities are investigated. Basic thermal characteristics such as specific heat at constant volume, thermal conductivity associated with lattice, thermal energy density, thermal relaxation time as well as acoustic coupling coefficients of La2CO3 intermetallic have been also calculated at same pressure range. The computation is also satisfactory in estimating the ultrasonic attenuation coefficients, arises due to the interaction of phonons, hardness as well as melting temperature under various pressures in this research work.

Keywords

Ultrasonic properties,mechanical properties, thermo-physical characteristics, thermal conductivity, rare earth sesquioxides (RES)

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