Acoustic wave propagation in Laves-phase compounds

Pandey, Dharmendra Kumar; Yadawa, Pramod Kumar; Yadav, Raja Ram

doi:10.1016/j.matlet.2007.03.031

Cited by 19 publications

(21 citation statements)

References 17 publications

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“…The relative magnitudes of C 11 , C 33 , and C 12 are well represented by our theoretical approach, and are in good agreement with the theoretical and experimental results, as shown in Table 1. The obtained values of the SOECs and TOECs are of the same order as those obtained in previous experimental and theoretical studies of other metallic alloys and metals [17,[22][23][24][25]. Hence, our theoretical approach to evaluating the elastic constants seems to be valid for these metals.…”

Section: Higher-order Elastic Constantssupporting

confidence: 82%

Computational Study of Ultrasonic Parameters of Hexagonal Close-Packed Transition Metals Fe, Co, and Ni

Yadawa¹

2011

Arab J Sci Eng

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The ultrasonic properties like ultrasonic attenuation, sound velocity in the hexagonal closed packed (hcp) Fe, Co and Ni have been studied along unique axis at room temperature. The second-and third order elastic constants have been calculated for these metals using Lennard-Jones potential. The velocities V L and V S1 have minima and maxima respectively, with 45 • with the unique axis of the crystal, while V S2 increases with the angle from unique axis. The inconsistent behavior of angle dependent velocities is associated to the action of second order elastic constants. Debye average sound velocities of these metals 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 metals, then the average sound velocity is found to be maximum. The comparison of calculated ultrasonic parameters with available theoretical/experimental physical parameters gives information about classification of these metals.

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Section: Higher-order Elastic Constantssupporting

confidence: 82%

Computational Study of Ultrasonic Parameters of Hexagonal Close-Packed Transition Metals Fe, Co, and Ni

Yadawa¹

2011

Arab J Sci Eng

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“…The combined effect of SOEC and density is reason for abnormal behaviour of angle dependent velocities. The nature of the angle dependent velocity curves in the present work is found similar as that for heavy rare-earth metals, laves-phase compounds, lanthanides metals and third group nitrides [14,17,22,29]. Thus the angle dependencies of the velocities in GaP nanowires are justified.…”

Section: Ultrasonic Velocity and Allied Parameterssupporting

confidence: 77%

“…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 are given in our previous papers [22].…”

Section: Ultrasonic Attenuation 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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“…reason for abnormal behavior of the angle dependent velocities. The nature of the angle dependent velocity curves in the present work is found similar to that for the third group nitrides, heavy rare-earth metals, laves-phase compounds and other hexagonal wurtzite structured materials [31,[33][34][35]. The chosen compound has the properties similar to their crystal structures.…”

Section: Ultrasonic Velocity and Allied Parameterssupporting

confidence: 74%

“…Thus, our theoretical approach for the calculation of second order elastic constants for hexagonally structured compound at room temperature is well justified. However, third order elastic constants have not been compared due to lack of the data in the literature but the negative third order elastic constants have been found in our previous papers for hexagonal structure materials [30,[33][34][35]. Hence, the theory applied for the evaluation of higher order elastic constants at room temperature is justified.…”

Section: Higher Order Elastic Constantsmentioning

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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Acoustic wave propagation in Laves-phase compounds

Cited by 19 publications

References 17 publications

Computational Study of Ultrasonic Parameters of Hexagonal Close-Packed Transition Metals Fe, Co, and Ni

Computational Study of Ultrasonic Parameters of Hexagonal Close-Packed Transition Metals Fe, Co, and Ni

Effect of temperature dependence ultrasonic velocities and attenuation of GaP nanowires

Non-destructive characterization of superionic conductor: lithium nitride

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