Journal of Pure and Applied Ultrasonics

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Temperature Dependent Elastic and Ultrasonic Properties of Silver Halide Crystals


Affiliations
1 Department of Physics, Nims University, Jaipur-303121, India
2 Department of Applied Physics, Amity School of Engineering and Technology, New Delhi-110061, India
 

The present study deals with the computation of higher order elastic constants and ultrasonic properties of AgCl and AgBr in temperature range 0-300K. The elastic constants are estimated using Coulomb and Born-Mayer potential with two basic parameters i.e., nearest neighbour distance and hardness parameter. The ultrasonic velocity for longitudinal and shear waves along <100>, <110> and <111> orientations for temperature range 100-300K have been evaluated with second order elastic constant and density of the silver halides. The Debye average velocity, Debye temperature, bulk modulus, Breazeale's non-linearity parameter, Young's modulus and Poisson's ratio are also computed. The fracture/toughness (B/G) ratio is less than 1.75 which shows that the compounds are brittle in nature at room temperature. The materials fulfil the Born criterion of stability. AgCl is stiffer in comparison to AgBr as it has higher values of elastic constants and ultrasonic velocity.

Keywords

Silver Halides, Elastic Properties, Ultrasonic Properties.
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  • Temperature Dependent Elastic and Ultrasonic Properties of Silver Halide Crystals

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Authors

Shivani Kaushik
Department of Physics, Nims University, Jaipur-303121, India
Vyoma Bhalla
Department of Applied Physics, Amity School of Engineering and Technology, New Delhi-110061, India
Devraj Singh
Department of Applied Physics, Amity School of Engineering and Technology, New Delhi-110061, India

Abstract


The present study deals with the computation of higher order elastic constants and ultrasonic properties of AgCl and AgBr in temperature range 0-300K. The elastic constants are estimated using Coulomb and Born-Mayer potential with two basic parameters i.e., nearest neighbour distance and hardness parameter. The ultrasonic velocity for longitudinal and shear waves along <100>, <110> and <111> orientations for temperature range 100-300K have been evaluated with second order elastic constant and density of the silver halides. The Debye average velocity, Debye temperature, bulk modulus, Breazeale's non-linearity parameter, Young's modulus and Poisson's ratio are also computed. The fracture/toughness (B/G) ratio is less than 1.75 which shows that the compounds are brittle in nature at room temperature. The materials fulfil the Born criterion of stability. AgCl is stiffer in comparison to AgBr as it has higher values of elastic constants and ultrasonic velocity.

Keywords


Silver Halides, Elastic Properties, Ultrasonic Properties.