The Library
A study on oxyhalide glasses
Tools
Tools
Tools
Sahar, Md Rahim (1990) A study on oxyhalide glasses. PhD thesis, University of Warwick.
|
PDF
WRAP_Theses_Sahar_1990.pdf - Submitted Version - Requires a PDF viewer. Download (5Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3202704~S15
Abstract
Oxychloride glasses in the ternary system Sb₂O₃ - PbCl₂ - ZnCl₂ have been prepared. The thermal properties and the crystallisation behaviour of these glasses have been investigated by differential scanning calorimetry, viscometry, x-ray diffraction, scanning electron microscopy with energy dispersive x-ray analysis and infra-red spectroscopy.
Thermal stability gaps, T₁ - T₄ up to 149°C are observed. The predominant crystal phases formed, depending on composition, are ZnCl₂, Sb₂O₃ and a lead antimony oxychloride Sillan phase whose stoichiometry varies with glass composition from PbSb₂O₂.Cl₂ to PbSb₁O₂.Cl. Relative crystal growth rates for the glasses have also been measured and values up to 0.16 μm sec⁻¹ are observed. These values are found to be strongly dependent on the chlorine content of the glasses as are also the viscosity characteristics.
The chemical durability of the glasses has also been studied under various conditions. Initial water dissolution rates between 10⁻² to 10⁻⁴ gm cm day were observed. The corrosion rates were found to be chlorine content dependent and reaction mechanisms are suggested.
The introduction of a heavy metal chloride such as BlCl₂ or TlCl, as a fourth component, was found to increase the chlorine content without much affecting the thermal stability. However, an excessive amount of chlorine makes the glass less durable.
| Item Type: | Thesis (PhD) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Oxychlorides -- Properties, Oxychlorides -- Thermal properties, Oxychlorides -- Stability, Crystallization, Crystal growth | ||||
| Official Date: | March 1990 | ||||
| Dates: |
|
||||
| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Holland, Diane | ||||
| Sponsors: | Universiti Teknologi Malaysia ; Malaysia. Jabatan Perkhidmatan Awam | ||||
| Format of File: | |||||
| Extent: | 116 leaves : illustrations, charts | ||||
| Language: | eng |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
