Four constant potential function of amorphous selenium and evaluation of its thermodynamic and acoustic properties

Venkatesh, R. ; Gopala Rao, R. V. ; Bandyopadhyay, Sumita (1997) Four constant potential function of amorphous selenium and evaluation of its thermodynamic and acoustic properties Pramana - Journal of Physics, 49 (3). pp. 269-283. ISSN 0304-4289

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Litov and Anderson after various considerations suggested a four constant potential function for a-Se as well as a-As2S3. Hence we also used a four constant potential function with the sole purpose of applying this potential function to obtain several acoustic, thermodynamic and other properties. We calculated several acoustic properties of a-Se like second order elastic constants (SOECs), their pressure derivatives, the longitudinal and transverse Gruneisen constant by two different methods, phonon frequencies, absorption band position through the use of Nath-Smith-Delaunay's equation, and the thermodynamic properties like heat capacity, bulk modulus, thermal Gruneisen constant, the pressure derivative of the bulk modulus (dK T/dP=C1), the pressure derivative ofC 1 which is related to Anderson-Gruneisen parameter, pressure derivative of Gruneisen constant namely γ' g which is related to second Gruneisen constant, characteristics of phonon frequencies, potential energy function through the use of fitted parameters and third order elastic constants. Finally we calculated K T at the reduced density of ρ/ρ 0=1.1.K T is obtained from the potential function with the fitted parameters. In all the above cases the calculated values are found to be in good agreement with experiment wherever available. In this connection it is important to point out that we eliminated 'C' a constant in the potential function using the equilibrium condition as was done by Litovet al in a-Se and Gerlichet al in the case of a-As2S3 as all amorphous substances are isotropic as mentioned by several authors. We contemplate to calculate several other properties for a-Se and a-As2S3 and present them at a later stage.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Second Order Elastic Constant (SOECs); Pressure Derivative of Elastic Constants; Longitudinal; Transverse and Thermal Gruneisen Constant; Absorption Band Position; Heat Capacity; Bulk Modulus; Pressure Derivative of Gruneisen Constant; Characteristics of Phonon Frequencies; Potential Energy Characteristics; Third Order Elastic Constants (TOECs)
ID Code:23901
Deposited On:01 Dec 2010 12:57
Last Modified:17 May 2016 07:42

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