Please use this identifier to cite or link to this item:
Title: Anharmonicity in thermal pressure for aluminium
Authors: Sharma, S K
Sharma, B S
Kumar, R
Keywords: Metal;Thermodynamic properties;Anharmonicity
Issue Date: Jul-2013
Publisher: NISCAIR-CSIR, India
Abstract: An expression for the volume dependence of thermal pressure is formulated using basic thermodynamic identities. It is applied to aluminium metal for which sufficiently reliable data are available for comparison. The calculations are performed using the two models viz. the Thomas-Fermi model and the Stacey-Davis model. It is found that the values of thermal pressure for m=6 in both models are almost the same. Thermal pressure increases with the increase in pressure. The anhormonic effects are found to be dominant below about (P=60 GPa). While above this, harmonic effects become dominant. The anharmonic effects are very important at low pressures and become less significant as the pressure is increased. Values of thermal pressure have been calculated by taking into account the effect of the change in volume on melting. The results obtained for aluminium indicate that the present model is capable of predicting the volume dependence of thermal pressure, which is found to be in good agreement with the available data for a wide range of pressures and temperatures
Page(s): 494-498
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.51(07) [July 2013]

Files in This Item:
File Description SizeFormat 
IJPAP 51(7) 494-498.pdf169.55 kBAdobe PDFView/Open

Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.