Journal of thermal analysis

, Volume 37, Issue 3, pp 513–519 | Cite as

Crystal lattice dynamics and phase transitions mechanism in potassium hydro (deutrium) sulphate crystals

  • M. E. Kassem
Article
Received:

Abstract

The phase transition in KHSO4 crystals of varying deutrium content and different Cu2+ concentration is studied. The specific heat at constant pressure,Cp, and DTA measurements are investigated. The measurements are carried out in the vicinity of phase transitionT c =468 K. Multiple peaks are observed in the temperature dependence ofCp and a noticeable change due to Cu2+ dopant. This behaviour can be attributed to the fact of order disappearance in partial melting of proton in sublattice.

Keywords

Polymer Sulphate Potassium Physical Chemistry Phase Transition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Es wurde die Phasenumwandlung in KHSO4 Kristallen mit unterschiedlichem Deuteriumgehalt und unterschiedlicher Cu2+-Konzentration studiert. Die isobare spezifische WÄrmeCp und DTA-Messungen wurden untersucht. Die Messungen wurden in der NÄhe des PhasenumwandlungspunktesT c =468 K durchgeführt. In TemperaturabhÄngigkeit vonCp wurden Mehrfachpeaks sowie eine bemerkbare Änderung in AbhÄngigkeit vom Cu2+-Gehalt beobachtet. Dieses Verhalten wurde erklÄrt.

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Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1991

Authors and Affiliations

  • M. E. Kassem
    • 1
  1. 1.Physics Department, Faculty of ScienceQatar UniversityDoha State of QatarEgypt

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