lambda-transition of NH4Cl and ND4Cl at high pressures


Yurtseven H., Salihoglu S., Sen S.

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, vol.244, no.7, pp.2589-2596, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 244 Issue: 7
  • Publication Date: 2007
  • Doi Number: 10.1002/pssb.200642154
  • Title of Journal : PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
  • Page Numbers: pp.2589-2596

Abstract

We predict in this study using the mean-field theory, the phase-line equation from the free energy expanded in terms of the order parameters of solid II and III phases of NH4Cl and ND4Cl close to the X-phase transitions at high pressures. Using the temperature and pressure dependence of the coefficients given in the phase-line equation, it is shown that the experimentally observed T-P phase diagram for the solid II-solid III transition, can be predicted from the mean field model studied here for both crystalline structures. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.