Affordable Access

Publisher Website

The dependence of the Anderson-Grüneisen parameter δTupon compression at extreme conditions

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
54
Issue
2
Identifiers
DOI: 10.1016/0022-3697(93)90313-g
Keywords
  • Lattice Dynamics
  • Thermodynamics
  • Mgo
  • Equations Of State
  • High Temperature Elasticity
Disciplines
  • Physics

Abstract

Abstract The parameter δ t is a dimensionless thermoelastic parameter important in thermodynamic studies involving high temperature at high pressure. We give a brief history of attempts to define δ T in terms of fundamental interatomic potentials. We show that ab initio calculations provide a way to find δ T(η, T) (where η = V V 0 ), since it is possible to find the minimum in the isochoric B T vs T data arising from the ab initio analysis ( B T is the isothermal bulk modulus). The method is demonstrated for MgO, where δ T is calculated over a wide η, T field. We find δ T decreases at high compression, but is independent of T. Knowledge of δ T(η, T) is important to find the high P-high T behavior of a number of important properties in thermal physics, including entropy, thermal expansivity, thermal pressure and the Grüneisen parameter.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments