Orientation dependence of ultrasonic attenuation

Raju, K. Srinivasa; Kailash,; Srivastava, Rudra Kant

doi:10.1016/j.phpro.2010.01.119

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…From the above results one can reach to the conclusion that the thermal relaxation time, ultrasonic wave velocities and attenuation are the properties which depends on the crystallographic directions or one can say that these properties are orientation dependent which strongly supports the results given by other investigators [14,15] for the same type of crystals that all these properties are strongly dependent on direction of polarization. The study of ultrasonic attenuation for longitudinal wave along <100> is more important in characterization of the crystal since its magnitude is more along this direction.…”

Section: Discussionsupporting

confidence: 85%

Ultrasonic Attenuation in Calcium Oxide

Kumar¹,

Kailash²,

Shrivastava³

et al. 2011

AMPC

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Ultrasonic attenuation studies can be used to characterize material not only after production but during processing as well. The most important causes of ultrasonic attenuation in solids are electron-phonon, phonon-phonon interaction and that due to thermo elastic relaxation. The two dominant processes that will give rise to appreciable ultrasonic attenuation at higher temperature are the phonon-phonon interaction also known as Akhiezer loss and that due to thermo elastic relaxation are observed in calcium oxide crystal. At frequencies of ultrasonic range and at higher temperatures in solids, phonon-phonon interaction mechanism is dominating cause for attenuation. Ultrasonic attenuation due to phonon-phonon interaction (α/f2)p-p and thermo elastic relaxation (α/f2)th are evaluated in Calcium Oxide crystal up to an elevated temperature from 100 K - 1500 K along <100>, <110> and <111> crystallographic directions. Temperature dependence of ultrasonic attenuation along different crystallographic direction reveals some typical characteristic features

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Section: Discussionsupporting

confidence: 85%

Ultrasonic Attenuation in Calcium Oxide

Kumar¹,

Kailash²,

Shrivastava³

et al. 2011

AMPC

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show abstract

“…The versatility of our model is further witnessed from its successful applications [18,27,28,60]. It may thus be concluded that the deformation mechanism generally provides a much better interpretation of crystal properties.…”

Section: Resultsmentioning

confidence: 79%

High temperature elastic anharmonicity in lanthanum mono-chalcogenides

Raju

2011

Can. J. Phys.

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The elastic behaviour of lanthanum mono-chalcogenides is investigated at elevated temperatures. This study includes second-and third-order elastic constants of compound semiconductors LaS, LaSe, and LaTe, starting from primary physical parameters, that is, nearest neighbour distance and hardness parameters, assuming long-and short-range potentials. The variations of elastic constants with temperature follow a systematic trend identical to that observed in other chalcogenides in the NaCl-type structure family. The present approach can also succeed in predicting the pressure derivatives of the elastic constants. The obtained results are compared with available theoretical data and are found to be in satisfactory agreement with present values.PACS Nos: 62.20.dc, 81.40.Jj, 63.20.kg Résumé : Nous étudions ici le comportement élastique de chalcogénures simples de lanthane à haute température. Nous incluons les constantes élastiques de second et troisième ordre des semi-conducteurs LaS, LaSe et LaTe, commençant avec les paramètres physiques primaires, comme la distance entre plus proches voisins et le paramètre de dureté, supposant des potentiels de courte et de longue portée. La variation en température des constantes élastiques suit une tendance systématique identique à celle observée dans d'autres chalcogénures de la famille NaCl. Notre approche peut également prédire les déri-vées des constantes par rapport à la pression. Les résultats obtenus sont comparés aux résultats théoriques existants avec lesquels ils sont en bon accord.[Traduit par la Rédaction]

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Elastic Constants, Structural Parameters and Elastic Perspectives of Thorium Mono‐Chalcogenides in Temperature Sensitive Region

Raju¹

2013

Responsive Materials and Methods

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Orientation dependence of ultrasonic attenuation

Cited by 5 publications

References 10 publications

Ultrasonic Attenuation in Calcium Oxide

Ultrasonic Attenuation in Calcium Oxide

High temperature elastic anharmonicity in lanthanum mono-chalcogenides

Elastic Constants, Structural Parameters and Elastic Perspectives of Thorium Mono‐Chalcogenides in Temperature Sensitive Region

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