The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide

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dc.contributor.advisorProut, E Gen_ZA
dc.contributor.authorO'Connor, Cyril Thomasen_ZA
dc.date.accessioned2016-03-21T19:25:09Z
dc.date.available2016-03-21T19:25:09Z
dc.date.issued1978en_ZA
dc.descriptionBibliography: p. 377-384.en_ZA
dc.description.abstractThe effect of very high intensity ultraviolet radiation on powdered calcium, barium, strontium and lithium azides in the temperature range -80,0° - 35,0°C has been studied. Powdered and pelleted calcium azide was also irradiated with ultraviolet radiation in the temperature range 35,0° - 90,0°C and powdered lithium azide in the temperature range 24,0° - 170,0°C. All these decompositions were purely photolytic. Powdered and pelleted calcium azide was also subjected to ultraviolet radiation in the temperature range 110,0° - 140,0°C. This latter decomposition was termed co-irradiation due to the fact that both thermal and photolytic mechanisms were operative in this temperature range. Except at low temperatures, the extent of the decomposition was almost the same as that of a simple thermal decomposition. Kinetic analyses, determination of activation energies, studies of the dependence of reaction rates on light intensity, the effect of introducing water vapour to the sample at various stages of decomposition and the observance of the colour of the sample at various stages of reaction have been carried out. Analogous results were obtained for all four azides at low temperatures and the results obtained for calcium and lithium azides at ambient and higher temperatures were analogous to those obtained for barium and strontium azides under similar conditions by previous workers. During photolysis the activation energy undenvent transitions, in all four azides, in the region of 0°C and in the region of 60°C. Co-irradiation studies of calcium azide commenced at temperatures greater than 100°C. Similar studies were not carried out on lithium azide since even at temperatures in the region of 180°C the rate of photolytic decomposition was very much greater than that of a purely thermal decomposition at the same temperature.en_ZA
dc.identifier.apacitationO'Connor, C. T. (1978). <i>The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/18116en_ZA
dc.identifier.chicagocitationO'Connor, Cyril Thomas. <i>"The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1978. http://hdl.handle.net/11427/18116en_ZA
dc.identifier.citationO'Connor, C. 1978. The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - O'Connor, Cyril Thomas AB - The effect of very high intensity ultraviolet radiation on powdered calcium, barium, strontium and lithium azides in the temperature range -80,0° - 35,0°C has been studied. Powdered and pelleted calcium azide was also irradiated with ultraviolet radiation in the temperature range 35,0° - 90,0°C and powdered lithium azide in the temperature range 24,0° - 170,0°C. All these decompositions were purely photolytic. Powdered and pelleted calcium azide was also subjected to ultraviolet radiation in the temperature range 110,0° - 140,0°C. This latter decomposition was termed co-irradiation due to the fact that both thermal and photolytic mechanisms were operative in this temperature range. Except at low temperatures, the extent of the decomposition was almost the same as that of a simple thermal decomposition. Kinetic analyses, determination of activation energies, studies of the dependence of reaction rates on light intensity, the effect of introducing water vapour to the sample at various stages of decomposition and the observance of the colour of the sample at various stages of reaction have been carried out. Analogous results were obtained for all four azides at low temperatures and the results obtained for calcium and lithium azides at ambient and higher temperatures were analogous to those obtained for barium and strontium azides under similar conditions by previous workers. During photolysis the activation energy undenvent transitions, in all four azides, in the region of 0°C and in the region of 60°C. Co-irradiation studies of calcium azide commenced at temperatures greater than 100°C. Similar studies were not carried out on lithium azide since even at temperatures in the region of 180°C the rate of photolytic decomposition was very much greater than that of a purely thermal decomposition at the same temperature. DA - 1978 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1978 T1 - The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide TI - The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide UR - http://hdl.handle.net/11427/18116 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18116
dc.identifier.vancouvercitationO'Connor CT. The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1978 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18116en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemistryen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemistryen_ZA
dc.titleThe photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azideen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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