It is rather well known that properties of solids under the effect of high pressure and high temperature provide valuable information for understanding the thermodynamic behavior, the equation of state, and the thermoplastic properties. Experimental studies conducted so far; have not been able to attain the extreme pressure and temperature conditions that exist in the earth’s lower mantle. Thus theoretical studies play an important role in advancing our knowledge of high pressure-high temperature physics of solids. Such studies involve the use of various thermodynamic relations and approximations regarding the variation of thermal expansion coefficient, bulk modulus, Anderson-Gruneisen parameter and the other related parameters with pressure and temperature. Reliable values of these quantities have been measured experimentally [1, 2] at room-temperature and atmospheric pressure. However, considerable uncertainties exist regarding their variation under high pressure (100 K bar) and high temperature ( 1000-2000 K).

Download PDF

References

1. S.K. Shrivastava, Indian J. Phy., 80(3), 247 (2006), 79(1), 47 (2005)
2. O.L. Anderson, J. Phys. Chem. Solids 27, 547 (1966).
3. Kamal Devlal and Kuldeep Kholeya; Indian J. Phys., 80(8), 801 (2006)
4. S. Raju, K. Sivasubramaniam, E Mohandas Physica B , 324, 312 (2002).
5. A. Dhoble, M. P. verma Phys. Stat. Sol. (b), 133, 491 (1986)
6. C.P. Singh, R.S. Chauhan, Indian J. Phys., 78(II) 1215 (2004).

Back