Nondestructive Ultrasonic Evaluation of Temperature-Dependent Mechanical and Elastic Properties of PbX (X = S, Se) compounds
Abstract
A comprehensive investigation of the elastic, mechanical, and thermo-acoustic properties of lead monochalcogenides PbX (X = S, Se) has been carried out along the principal crystallographic directions , and within the temperature range of 0–300 K using ultrasonic nondestructive evaluation method. The second- and third-order elastic constants (SOECs and TOECs) were computed using the Coulomb and Born–Mayer potential frameworks, confirming the elastic stability of the materials under study. Derived mechanical parameters and ultrasonic velocities were obtained from SOECs, indicating brittle mechanical behavior based on the Pugh’s ratio. At 300 K, the Debye temperature, Debye velocity, lattice thermal conductivity, acoustic nonlinearity parameter, and ultrasonic attenuation coefficient were evaluated along the studied orientations. Among all the directions, the orientation exhibited the highest Debye temperature and Debye velocity. The dominant mechanism of ultrasonic attenuation was identified as Akhiezer-type, emphasizing its relevance in thermal dissipation and acoustic damping. The findings suggest that PbSe possesses superior elastic stiffness, whereas PbS exhibits enhanced thermal conductivity and stronger phonon interactions. These characteristics underscore the potential of PbS and PbSe for applications in thermoelectric and ultrasonic sensing technologies.
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References
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Copyright (c) 2026 Sudhanshu Tripathi, Praveen Singh, Anurag Singh, Devraj Singh, R. Khenata, M. Boudjelal, H. Meradji, Ajit Kumar Maddheshiya, Shanay Rab, M. Faizan, S. Bin-Omran

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