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Mishra, Giridhar
- Mechanical and Thermophysical Properties of Europium Monochalcogenides
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Authors
Affiliations
1 Department of Applied Physics, Amity School of Engineering and Technology, Bijwasan, New Delhi-110061, IN
2 Advanced Technology Development Center, Indian Institute of Technology, Kharagpur-721302, IN
1 Department of Applied Physics, Amity School of Engineering and Technology, Bijwasan, New Delhi-110061, IN
2 Advanced Technology Development Center, Indian Institute of Technology, Kharagpur-721302, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 38, No 1 (2016), Pagination: 23-27Abstract
The ultrasonic properties of europium chalcogenides EuX (X = O, S and Te) have been computed at room temperature along <100>, <110> and <111> orientations. The higher order elastic constants have also been computed using Coulomb and Born-Mayer potential upto second nearest neighbour and these are applied to compute ultrasonic properties. The mechanical and thermal properties like Youngs modulus, bulk modulus, Cauchy's relation, Zener anisotropy factor, fracture to toughness ratio, Debye temperature have also been calculated for finding the future performance of these materials. Since these materials follow the Born stability criteria, so these are mechanically stable. The fracture to toughness ratio is less than 1.75, hence these are brittle in nature. The results of present investigation have been analysed in correlation with mechanical and thermophysical properties of the similar materials.Keywords
Monochalcogenides, Elastic Properties, Thermal Properties, Ultrasonic Properties.Full Text
- Characterization of Cu-PVA Nanofluids:Ultrasonic and Thermal Properties
Abstract Views :156 |
PDF Views:9
Authors
Vimal Pandey
1,
Giridhar Mishra
2,
Meher Wan
3,
Devraj Singh
2,
A. K. Tiwari
4,
R. R. Yadav
3,
Bharat Mishra
5
Affiliations
1 Mahatma Gandhi Chitrakoot Gramodaya Vishwavidyalaya, Satna-485334, IN
2 Amity School of Engineering and Technology (Affiliated to GGSIP University), Bijwasan, New Delhi-110061, IN
3 University of Allahabad, Allahabad-211002, IN
4 B.S.N.V.P.G. College (University of Lucknow) Charbagh, Lucknow-226001, IN
5 Mahatma Gandhi Chitrakoot Gramoday Vishwavidyalaya, Satna-485334, IN
1 Mahatma Gandhi Chitrakoot Gramodaya Vishwavidyalaya, Satna-485334, IN
2 Amity School of Engineering and Technology (Affiliated to GGSIP University), Bijwasan, New Delhi-110061, IN
3 University of Allahabad, Allahabad-211002, IN
4 B.S.N.V.P.G. College (University of Lucknow) Charbagh, Lucknow-226001, IN
5 Mahatma Gandhi Chitrakoot Gramoday Vishwavidyalaya, Satna-485334, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 37, No 2-3 (2015), Pagination: 33-38Abstract
Nanofluids have unique features different from conventional solid-liquid mixtures which have millimeter or micrometer sized particles dispersed in some base fluid. Due to their excellent characteristics, these new types of fluids have attracted wide interest in recent years. It is found that nanofluids have significantly higher thermal conductivity than the base fluids. In this work we focus on the ultrasonic and thermal properties of nanofluids. Nanofluids containing copper nanoparticles with base fluid polyvinyl alcohol (PVA) have been developed in our laboratory. These nanofluids are characterized by UV-Visible spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). Temperature dependent ultrasonic velocity and ultrasonic attenuation measurements are performed for different concentration of the copper nanoparticles in the PVA. Hot Disk Thermal Constant Analyser is used for the measurement of the thermal conductivity of synthesized nanofluids. Experimental results show that the thermal conductivities of the nanofluids are higher than that of base fluid PVA. The obtained results were analyzed taking into account the ultrasonic and thermal behavior of matrix and particles. Possible mechanism for the enhancement of thermal conductivity of the nanofluids using theoretical model is also discussed.Keywords
Nanofluids, Ultrasonic Properties, Enhanced Heat Transfer, Effective Thermal Conductivity, Brownian Motion.Full Text
- Non Linear Elastic Properties and Ultrasonic Attenuation in Ni-Al-Cr Alloy
Abstract Views :194 |
PDF Views:0
Authors
Affiliations
1 Physics Department, University of Allahabad, Allahabad-211002, IN
2 Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, IN
1 Physics Department, University of Allahabad, Allahabad-211002, IN
2 Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 33, No 3 (2011), Pagination: 54-58Abstract
The single crystal higher order elastic constants of Ni-Al-Cr ternary alloy at different temperatures have been calculated with the help of interaction potential model. Ultrasonic attenuation in the ternary alloy is determined using higher order elastic constants. Other ultrasonic parameters such as Gruneisen numbers, acoustic coupling constants and acoustical anisotropy have been also calculated to discuss the ultrasonic properties of the ternary alloys. The ultrasonic wave propagation behavior at different temperatures for Ni-Al-Cr alloy have been investigated and correlated with respect to the microstructural phenomena during the wave propagation and thermal behavior of the ternary alloy. An ultrasonic mechanism has been developed to correlate the temperature dependent ultrasonic properties with the thermophysical properties particularly the thermal conductivity of the alloy. The results are compared with earlier studies of the elastic constants and are found to be in good agreement. We find that the thermal conductivity of Ni-Al-Cr alloy plays important role in the ultrasonic wave propagation behavior inside the alloy.Keywords
Ternary Alloy, Elastic Constants, Ultrasonic Attenuation, Thermal Properties.Full Text
- Nondestructive Characterization of a Lyotropic Liquid Crystalline System
Abstract Views :170 |
PDF Views:0
Authors
Affiliations
1 Physics Department, University of Allahabad, Allahabad-211002, IN
1 Physics Department, University of Allahabad, Allahabad-211002, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 31, No 1 (2009), Pagination: 31-35Abstract
In the present work, the characterization of a calamitic liquid crystal mixture-sodium lauryl sulphate (SLS)/decanol/water-has been reported using ultrasonic velocity and absorption measurements as a function of temperature and concentration. The experimental tools used were, ultrasonic interferometry for the velocity and pulse-echo technique for the absorption measurements. The results are discussed in terms of the temperature and concentration dependent lyotropic liquid crystal formed in the material system.Keywords
Ultrasonic Velocity, Ultrasonic Absorption, Lyotropic Liquid Crystals, Pulse-Echo Technique.Full Text
- Conference Report on International Conference on Ultrasonics and Materials Science for Advanced Technology (ICUMSAT-2019)
Abstract Views :202 |
PDF Views:1
Authors
Affiliations
1 VBSPU, Jaunpur (U.P.), IN
1 VBSPU, Jaunpur (U.P.), IN
Source
Journal of Pure and Applied Ultrasonics, Vol 42, No 2 (2020), Pagination: 55-56Abstract
International Conference on Ultrasonics and Materials Science for Advanced Technology (ICUMSAT-2019) was organized by Department of Physics, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research, Veer Bahadur Singh Purvanchal University, Jaunpur- U.P. during November 16-18, 2019.. Prof. Dr. Krishan Lal, FNA, Co-Chair, IAP for Science, Former Director- NPL, New Delhi, Former President- INSA, New Delhi was the Chief Guest.Full Text
- Ultrasonic Characterization of Intermetallic Compounds
Abstract Views :169 |
PDF Views:1
Authors
Affiliations
1 Department of Physics B.S.N.V.P.G. College, Charbagh, Lucknow-226 001,, IN
2 Department of Physics, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research, Veer Bahadur Singh Purvanchal University, Jaunpur-222 003,, IN
1 Department of Physics B.S.N.V.P.G. College, Charbagh, Lucknow-226 001,, IN
2 Department of Physics, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research, Veer Bahadur Singh Purvanchal University, Jaunpur-222 003,, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 43, No 3-4 (2021), Pagination: 56-60Abstract
A simple interaction potential model has been established to calculate the higher order elastic constants of the intermetallic compounds NdS, NdSe, NdTe in the temperature range from 100-500 K. The ultrasonic velocity, Debye average velocity, thermal relaxation time and acoustic coupling constant are calculated using the higher order elastic constants and other related parameters. Ultrasonic attenuation due to phonon-phonon interaction and thermoelastic loss are studied as a function of temperature along <111> direction. Important characteristic features well connected to the acoustical parameters are discussed.Keywords
Ultrasonic Propagation, Elastic Constants, IntermetallicsFull Text
References
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- Singh D., Mishra G., Kumar R. and Yadav R. R., Temperature dependence of elastic and ultrasonic properties of sodium borohydride, Commun. Phys. 27 (2017) 151.
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- Verma A. K., Kaushik S., Singh D. and Yadav R. R., Elastic and thermal properties of carbides of U, Pu, and Am, J. Phys. Chem. Solids 133 (2019) 21-27.
- Bhalla V., Singh D. and Jain S. K., Mechanical and thermophysical properties of rare-earth monopnictides, Int. J. Comput. Mater. Sci. Eng. 05 (2016) 1650012.
- Investigation of temperature dependent mechanical, thermophysical and ultrasonic properties of ScZrHf ternary alloy
Abstract Views :182 |
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Authors
Affiliations
1 Department of Physics, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research,Veer Bahadur Singh Purvanchal University, Jaunpur-222001, Uttar Pradesh India., IN
1 Department of Physics, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study and Research,Veer Bahadur Singh Purvanchal University, Jaunpur-222001, Uttar Pradesh India., IN
Source
Journal of Pure and Applied Ultrasonics, Vol 44, No 3-4 (2022), Pagination: 79-85Abstract
In this paper, we present theoretically evaluated values of temperature mechanical, thermophysical and ultrasonic properties of hexagonal close-packed structured medium entropy alloy ScZrHf in temperature range of 0-900 K. By utilizing the Lennard-Jones potential model, we have computed the second order and third order elastic constants (SOECs and TOECs) with the help of lattice parameters. While all of the SOECs have been found to be decreasing with increase in temperature, the TOECs increases with temperature. SOECs and TOECs have been used to compute the elastic moduli such as: bulk modulus, shear modulus, Young's modulus and Poisson's ratio, and ultrasonic velocities at different angle along unique axis. Further, the thermal properties such as Debye temperature, Debye heat capacity, energy density of ScZrHf in temperature range of 0-900 K and lattice thermal conductivity of ScZrHf in temperature range of 300-900K have been estimated. The lattice thermal conductivity decreases with increase in temperature. Finally, the ultrasonic attenuation due to phonon - phonon interaction in both longitudinal and shear modes and themoelastic relaxation mechanism have been computed for ScZrHf ternary alloy in the temperature range of 300-900 K and it has been found that the attenuation due to phonon-phonon interaction is much higher than that due to thermoelastic relaxation mechanism.Keywords
Refractory Medium-Entropy Alloys, Hexagonal Closed-Packed, Ultrasonic Behaviour, Rare-Earth, Transition Metal.Full Text
References
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- Tiwari A.K., Mishra G., Dhawan P.K., and Singh D., Ultrasonic characterization of intermetallic compounds, J. Pure Appl. Ultrason., 43, (2021) 56-60.