Journal of Materials Physics and Chemistry
ISSN (Print): 2333-4436 ISSN (Online): 2333-4444 Website: https://www.sciepub.com/journal/jmpc Editor-in-chief: Prof. Dr. Alireza Heidari, Ph.D., D.Sc.
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Journal of Materials Physics and Chemistry. 2015, 3(1), 1-5
DOI: 10.12691/jmpc-3-1-1
Open AccessArticle

Elastic and Acoustic Properties of XB2 (X= V, Nb & Ta) Transition Metal Diborides

Pramod Kumar Yadawa1,

1Department of Applied Physics, AMITY School of Engineering and Technology, New Delhi- 110 061, India

Pub. Date: May 19, 2015

Cite this paper:
Pramod Kumar Yadawa. Elastic and Acoustic Properties of XB2 (X= V, Nb & Ta) Transition Metal Diborides. Journal of Materials Physics and Chemistry. 2015; 3(1):1-5. doi: 10.12691/jmpc-3-1-1

Abstract

The elastic properties, acoustic properties and mechanical properties of the group VB transition metal diborides like VB2, NbB2 and TaB2 have been studied along unique axis at room temperature. The second- and third order elastic constants (SOEC & TOEC) have been calculated for these diborides using Lennard–Jones potential model. The velocities VL and VS2 increases with the angle from the unique axis and VS1 have maximum at 45° with unique axis of the crystal. The inconsistent behaviour of angle dependent velocities is associated to the action of second order elastic constants. Debye average sound velocities of these compounds are increasing with the angle and has maximum at 55° with unique axis at room temperature. Hence when a sound wave travels at 55° with unique axis of these materials, then the average sound velocity is found to be maximum. The mechanical properties of VB2 are better than TaB2, because VB2 has low ultrasonic attenuation comparison than TaB2. The diborides are good electrical conductors; they are attractive for the same types of applications as other hard refractory materials such as in composite and in hard coating. Traditional applications o such materials are based on their interesting combination of mechanical and transport properties.

Keywords:
elastic properties VB transition metal diborides thermal conductivity acoustic properties

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