STRUCTURAL PHASE-TRANSITIONS IN SOLIDS WITH APPLIED STRESSES AND FIELDS, AND EFFECT OF ISOTOPIC IMPURITIES ON FREE-ENERGY Academic Article uri icon

abstract

  • Subject to the assumptions described in the text, we obtain the following expression for the transition temperature Tc associated with a structural phase transition: Tc = (U + iPiai)/kB, 2/ln(/). Here U is the change in energy, the Pi are given by the pressure, stresses, and applied fields, the ai are given by the changes in volume, strains, and dipole moments, and is the determinant of the force constant matrix. We also give a result which may be useful for solids containing isotopic impurities: At high temperatures and in the harmonic approximation, G = (3/2) kBTkln(mk/mk), where G is the change in Gibbs free energy when some of the particle masses are changed from mk to mk.

published proceedings

  • JOURNAL OF CHEMICAL PHYSICS

author list (cited authors)

  • ALLEN, R. E.

citation count

  • 3

complete list of authors

  • ALLEN, RE

publication date

  • January 1976