Ultrasonic properties of hexagonal ZnS at nanoscale

Pandey, Dharmendra Kumar; Yadawa, Pramod Kumar; Yadav, R.R.

doi:10.1016/j.matlet.2007.04.028

Cited by 42 publications

(45 citation statements)

References 29 publications

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“…Anomalous behaviour of angle dependent velocities is correlated to the behaviour of second order elastic constants. The nature of the angle dependent velocity curves in the present work is the same as the nature of angle dependent velocity curve for others hexagonal wurtzite structured materials [13,[15][16][17][18]. Thus our angle dependency of the velocities for these nanocrystalline wurtzite structured alloys is justified.…”

Section: Discussionsupporting

confidence: 61%

Acoustic Wave Propagation in Nanocrystalline RuCo Alloys

Yadawa¹,

Singh²,

Pandey³

et al. 2011

AMPC

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The ultrasonic properties like elastic constant, ultrasonic velocity in the hexagonal structured nanocrystalline RuCo alloys have been studied along unique axis at room temperature. The second and third order elastic constants (SOEC & TOEC) have been calculated for these alloys using Lennard-Jones potential. The orientation dependent ultrasonic velocity has been also evaluated to study the anisotropic behaviour of these alloys. The velocities V L and V S1 have minima and maxima, respectively at 45° with unique axis of the crystal, while V S2 increases with the angle from unique axis. The inconsistent behaviour of angle-dependent velocities is associated to the action of second order elastic constants. Debye average ultrasonic velocities of these alloys are increasing with the angle and has maximum at 55° with unique axis at room temperature. Hence, when a ultrasonic wave travels at 55° with unique axis of these alloys, then the average ultrasonic velocity is found to be maximum. Elastic constants and density are mainly the affecting factor for anomalous behaviour of ultrasonic velocity in these alloys. The mechanical and ultrasonic properties of Co 0.75 Ru 0.25 alloy will be better than the other compounds due to their high SOEC, ultrasonic velocity and low ultrasonic attenuation. Co 0.75 Ru 0.25 alloy is more suitable for industrial and other uses, as it has the highest elastic constants and lowest ultrasonic attenuation in comparison to other of these alloys. The results of this investigation are discussed in correlation with other known thermophysical properties.

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Section: Discussionsupporting

confidence: 61%

Acoustic Wave Propagation in Nanocrystalline RuCo Alloys

Yadawa¹,

Singh²,

Pandey³

et al. 2011

AMPC

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“…The Debye average velocity (V D ) is well related to longitudinal (V L ) and shear wave (V S1 , V S2 ) velocities. The expressions for ultrasonic velocities were found in our previous papers [30,31].…”

Section: Ultrasonic Attenuation and Allied Parametersmentioning

confidence: 99%

“…The ultrasonic attenuation coefficient (A ) Akh due to phonon-phonon interaction and thermoelastic loss (A ) T h mechanisms is given by the following expression [30,31]:…”

Section: Ultrasonic Attenuation and Allied Parametersmentioning

confidence: 99%

Non-destructive characterization of superionic conductor: lithium nitride

Yadawa¹

2014

Materials Science-Poland

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Higher order elastic constants have been calculated in hexagonally structured superionic conductor Li 3 N at room temperature using the interaction potential model. The temperature variation of the ultrasonic velocities was evaluated along different angles with z axis (unique axis) of the crystal, using the second order elastic constants. The ultrasonic velocity decreased with the temperature along a particular orientation of the unique axis. Temperature variation of the thermal relaxation time and Debye average velocities was also calculated along the same orientation. The temperature dependency of ultrasonic properties was discussed in correlation with elastic, thermal and electrical properties. It has been found that the thermal conductivity is the main contributor to the behavior of ultrasonic attenuation as a function of temperature and the cause responsible for attenuation is phonon-phonon interaction. The mechanical properties of Li 3 N at low temperature are better than at high temperature because at low temperature it has low ultrasonic attenuation. Superionic conductor lithium nitride has many industrial applications, such as those used in portable electronic devices.

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“…The ultrasonic attenuation coefficient (A) Akh due to phonon-phonon interaction and thermoelastic relaxation mechanisms is given by the following expression [21].…”

Section: Ultrasonic Attenuation and Allied Parametersmentioning

confidence: 99%

“…4). Since V D is calculated using V L , V S1 and V S2 [14,21], therefore the angle variation of V D is influenced by the constituent ultrasonic velocities. The maximum V D at 55°is due to a significant increase in longitudinal and pure shear (V S2 ) wave velocities and a decrease in quasi-shear (V S1 ) wave velocity.…”

Section: Ultrasonic Velocity and Allied Parametersmentioning

confidence: 99%

Effect of temperature dependence ultrasonic velocities and attenuation of GaP nanowires

Yadawa¹

2016

J Theor Appl Phys

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The higher order elastic constants of the hexagonal wurtzite crystal structure of GaP nanowires have been evaluated using Lennard-Jones potential model at room temperature. The ultrasonic velocity increases with the temperature along particular orientation with the unique axis of crystals. Temperature variation of the thermal relaxation time and Debye average velocities is also calculated along the same orientation. The temperature dependency of the ultrasonic properties is discussed in correlation with elastic, thermal and electrical properties. It has been found that the thermal conductivity is the main contributor to the behaviour of ultrasonic attenuation as a function of temperature and the responsible cause of attenuation is phonon-phonon interaction. The mechanical properties of GaP nanowires at low temperature are better than at room temperature, because at low temperature it has low ultrasonic velocity and ultrasonic attenuation. A particularly interesting case is GaP, which is the only (Ga, In)-V semiconductor with an indirect gap in the bulk phase, and are indispensable in modern microelectronic industries.

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Ultrasonic properties of hexagonal ZnS at nanoscale

Cited by 42 publications

References 29 publications

Acoustic Wave Propagation in Nanocrystalline RuCo Alloys

Acoustic Wave Propagation in Nanocrystalline RuCo Alloys

Non-destructive characterization of superionic conductor: lithium nitride

Effect of temperature dependence ultrasonic velocities and attenuation of GaP nanowires

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