Some aspects of the phase transformation in solid CsCl

Hette Weijma

Research output: ThesisThesis fully internal (DIV)

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This thesis is devoted to three subjects related to the B2—_BI phase transformation in CsCl. i) The ionic conductivity experiments on CsCl up to 1967 did not yield unambiguous results (see section 3.1). Therefore, the ionic conduction in both phases of CsCl was studied as a function of temperature in as much detail as possible. This part of the investigation deals with the properties of cesium choride in the temperature regions outside the transformation region (chapter 3). ii) The influence of addition of CsBr, RbCI of KCI to CsCl on its transition temperature and latent heat has been studied by means of differential thermal analysis (D.T.A.) and ionic conductivity measurements. The purpose was to relate the thermodynamical properties relevant to the temperature induced phase transition in CsCl to those of alkali halides possessing a pressure induced phase change. The study of the CsCI-CsBr system enabled us to make predictions about a possible phase transition in CsBr (Chapter 4). iii) A study of the mechanism of the phase transformation in CsCI, i.e. the kinetics of the process, was carried out because this subject has received too little attention in the literature. Only Gadl et al. [24] (CsCI) and Livshitz et al. [23] (KCI) have reported about kinetic aspects of the B2_BI transition in alkali halides. We have investigated in particular the dependence of the kinetics upon the heating and cooling conditions (chapters 5 and 6). Experimental techniques used include both conductivity and dilatometry measurements. ... Zie: Summary
Original languageEnglish
QualificationDoctor of Philosophy
  • Arends, J., Supervisor, External person
  • Dekker, Jasja J.A., Supervisor, External person
Publication statusPublished - 1971

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