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Title: Some physical properties of ionic melts in relation to their structure
Author: Smith, William Ewen
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1965
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The unusual physical behaviour of the melt of potassium nitrate and calcium nitrate had previously been reported. In the present study, the liquid behaviour is defined quantitatively in terms of physical properties, some results are taken on related systems and a structural explanation postulated to explain the data. A brief review of fundamental liquid theory and theories of viscosity transport are given. A more detailed analysis of the experimental measurements in molten salts most relevant to a structural analysis and a study of previous work in the monodivalent nitrate melts leads to a simple structural model capable of a limited interpretation of experimental behaviour. Qualitative studies on the nature of the low temperature form of certain compositions of the mixed nitrate melts verifies previous reports of glass formation. A quantitative study in the liquid range of the viscosity of the binary mixtures of sodium, potassium, rubidium and caesium nitrate with calcium nitrate established the essentially non-Arhenius nature of the viscosity plots. An investigation of the electrical conductivity and U.V. spectra of the melts was then carried out. The conclusions drawn indicated the possibility of anomalous dielectric effects in the supercooled melt. Techniques were developed for this study and results indicating some form of loss mechanism obtained. Various possible correlations of the data on the basis of simple molecular models were calculated and some conception of the nature cf the low temperature liquid form established. A final model explaining the varied behaviour of the properties, including dielectric effects is given.
Supervisor: Ubbelohde, A. R. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available