The Ca$ sb{x}$K$ sb{1-x}$(NO$ sb3) sb{1+x}$ glass system has been studied by means of X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC). The structure of the glass system was studied in XRD experiments and from the Radial Distribution Function (RDF). A structural model for this glass system was suggested with the agreement between the RDF calculation and structure model geometric calculation. DSC studies ranged from glass transition and crystallization to melting. The activation energy for crystallization was obtained. / The difficulty of handling the glass in open air was overcome by using vacuum tube to melt the sample and glove box with Ar gas to handle the glass. It is found that the handling of the samples, i.e. avoiding exposure to moisture is critical to maintaining sample quality. / For the structural studies, glasses of $ rm Ca sb{0.4}Na sb{0.6}(NO sb3) sb{1.4}, Ca sb{0.4}Rb sb{0.6}(NO sb3) sb{1.4}$ and $ rm Mg sb{0.4}K sb{0.6}(NO sb3) sb{1.4}$ were also prepared for comparison with the $ rm Ca sb{x}K sb{1-x}(NO sb3) sb{1+x}$ glasses. The same structural model applied to all of them with similar agreement. / For the DSC studies, only the $ rm Ca sb{x}K sb{1-x}(NO sb3) sb{1+x}$ glasses were used. The relation between increase of glass transition temperature $T sb{g}$ and that of divalent cation concentration is linear. It was observed that unlike the metallic glass system, the crystallization activation energies do not change with the glass composition. We also observed the irreversible relaxation effect in this glass system and the effect of supercooling in the DSC to form the glass.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.26178 |
| Date | January 1993 |
| Creators | Wang, Yan-Bin |
| Contributors | Ryan, D. H. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001394241, proquestno: MM94542, Theses scanned by UMI/ProQuest. |
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