A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Wadhwa, Shikha
- Ultrasonic Attenuation in Yttrium Monochalcogenides
Authors
1 USICT, Guru Gobind Singh Indraprastha University, Sector 16C, Dwarka , New Delhi-110078, IN
2 Amity Institute of Applied Sciences, Amity University, Noida-201313, IN
3 State Council of Educational Research & Training Haryana, Gurugram-122 001, IN
4 Amity School of Engineering and Technology, Delhi, Noida-201313, IN
5 Amity Institute of Nanotechnology, Amity University, Noida-201313, IN
6 Department of Physics, P.P.N. (P.G.) College, Kanpur-208001, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 40, No 4 (2018), Pagination: 93-99Abstract
The present paper reports ultrasonic properties of yttrium chalcogenides (YCh: Ch=S, Se and Te) along <110> direction in the temperature region 100-500 K. The Coulomb and Bom-Mayer potential model is applied to compute the higher order elastic constants. These elastic constants are used to utilise for computing ultrasonic velocity, ultrasonic Grüneisen parameters, thermal conductivity and ultrasonic attenuation. Additionally, the second order elastic constants has been applied to evaluate many mechanical properties such as Young modulus, bulk modulus, Cauchy's relation, Zener's anisotropy factor, toughness to fracture ratio for the prediction about the chosen materials. The YCh follow the Born stability criterion, so these materials are mechanical stable. The toughness to fracture is greater than 0.57, so these materials are brittle in nature. The thermal conductivity is also computed by means of Slack and Berman approach. Finally the temperature ultrasonic attenuation due to phonon-phonon interaction and thermo-elastic relaxation mechanisms has been computed along <110> at room temperature. The achieved results for yttrium monochalcogenides are discussed with similar type of materials.
Keywords
Monochalcogenides, Elastic Constants, Ultrasonic Properties, Thermal Properties.References
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Authors
1 University School of Information, Communication and Technology, Guru Gobind Singh Indraprastha University, Dwarka Sector 16C, New Delhi-110078, IN
2 Department of Physics, Professor Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study & Research, Veer Bahadur Singh Purvanchal University, Jaunpur-222003, U.P., IN
3 Department of Physics, Bappa Sri Narain Vocational P.G. College (KKV), Charbagh, Lucknow-226001, U.P., IN
4 Amity Institute of Nanotechnology, Amity University Uttar Pradesh, Noida-201313, U.P., IN
Source
Journal of Pure and Applied Ultrasonics, Vol 42, No 2 (2020), Pagination: 46-51Abstract
Ultrasonic study of B2 -structured hafnium based compounds HfX(X=Os, Ir and Pt) along direction were evaluated at room temperature. Initially, the Coulomb and Born-Mayer potential model was used to find out the higher order elastic constants of HfX at room temperature. We have used the second order elastic constants (SOECs) to compute the mechanical properties such as bulk modulus, Young's modulus, shear modulus, Pugh's ratio, Poisson's ratio, Zener anisotropic factor, Vicker's hardness, Lame's modulus of chosen materials. Further, the SOECs and third order elastic constants (TOECs) were applied to compute ultrasonic velocities and Debye temperature. The thermal conductivity and thermal relaxation time of chosen monopnictides compounds have also been computed at room temperature. We have found that HfOs is strongest and most fit material for crystallographic study in B2 phase. In addition to above evaluated parameters, energy density, specific heat per unit volume, thermal conductivity, acoustic coupling constants and ultrasonic attenuation for longitudinal and shear modes propagation along direction have been estimated. The ultrasonic attenuation was least in case of HfOs. Obtained results have been discussed and justified with available findings for their future prospects.Keywords
Elastic Constants, Mechanical Properties, Thermal Conductivity, Ultrasonic Attenuation.References
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