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The photolysis and co-irradiated decomposition of barium and strontium azides
The effect of ultraviolet radiation on sieved powders and pellets of barium azide in the temperature range 27,0° - 135,0°C and of strontium azide in the temperature range 30,0° - l35,0°C has been studied. Decompositions in the temperature range 27,0°- 100,0°C for barium azide and 30,0° - 90,0°C for...
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| Format: | Thesis |
| Language: | English |
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Department of Chemistry
2016
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| _version_ | 1867613236245823488 |
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| access_status_str | Open Access |
| author | Shephard, Enid Gwendolyn |
| author2 | Prout, E G |
| author_browse | Prout, E G Shephard, Enid Gwendolyn |
| author_facet | Prout, E G Shephard, Enid Gwendolyn |
| author_sort | Shephard, Enid Gwendolyn |
| collection | Thesis |
| description | The effect of ultraviolet radiation on sieved powders and pellets of barium azide in the temperature range 27,0° - 135,0°C and of strontium azide in the temperature range 30,0° - l35,0°C has been studied. Decompositions in the temperature range 27,0°- 100,0°C for barium azide and 30,0° - 90,0°C for strontium azide have been termed photolytic decompositions, while reactions in the temperature range 110,0° - l35,0°C (the thermal decomposition temperature range) for both compounds have been termed co-irradiated decompositions. The ultraviolet light source used was a very high intensity 100 watt "point source" high pressure mercury arc lamp. The extent of decomposition was almost the same as a simple thermal decomposition. Kinetic analyses, activation energy determinations, studies of the dependence of reaction rates on light intensity, the effect of water vapour on the sample at various stages of reaction and the observance of the colour of the sample at various stages of reaction have been carried out. Analogous results were obtained for the two compounds. In the photolytic temperature range two distinct modes of decomposition are postulated to occur, the transition temperature occurring at 60,0°C for barium azide and at 50,0°C for strontium azide. During co-irradiation it is proposed that decomposition occurs via the expected thermal decomposition process and the photolytic mechanism or a slight variation thereof, above 60,0°C for barium azide and above 50,0°C for strontium azide. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22404 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:56.154Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Chemistry |
| publisherStr | Department of Chemistry |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22404 The photolysis and co-irradiated decomposition of barium and strontium azides Shephard, Enid Gwendolyn Prout, E G Chemistry The effect of ultraviolet radiation on sieved powders and pellets of barium azide in the temperature range 27,0° - 135,0°C and of strontium azide in the temperature range 30,0° - l35,0°C has been studied. Decompositions in the temperature range 27,0°- 100,0°C for barium azide and 30,0° - 90,0°C for strontium azide have been termed photolytic decompositions, while reactions in the temperature range 110,0° - l35,0°C (the thermal decomposition temperature range) for both compounds have been termed co-irradiated decompositions. The ultraviolet light source used was a very high intensity 100 watt "point source" high pressure mercury arc lamp. The extent of decomposition was almost the same as a simple thermal decomposition. Kinetic analyses, activation energy determinations, studies of the dependence of reaction rates on light intensity, the effect of water vapour on the sample at various stages of reaction and the observance of the colour of the sample at various stages of reaction have been carried out. Analogous results were obtained for the two compounds. In the photolytic temperature range two distinct modes of decomposition are postulated to occur, the transition temperature occurring at 60,0°C for barium azide and at 50,0°C for strontium azide. During co-irradiation it is proposed that decomposition occurs via the expected thermal decomposition process and the photolytic mechanism or a slight variation thereof, above 60,0°C for barium azide and above 50,0°C for strontium azide. 2016-11-01T10:36:22Z 2016-11-01T10:36:22Z 1974 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22404 eng application/pdf Department of Chemistry Faculty of Science University of Cape Town |
| spellingShingle | Chemistry Shephard, Enid Gwendolyn The photolysis and co-irradiated decomposition of barium and strontium azides |
| thesis_degree_str | Doctoral |
| title | The photolysis and co-irradiated decomposition of barium and strontium azides |
| title_full | The photolysis and co-irradiated decomposition of barium and strontium azides |
| title_fullStr | The photolysis and co-irradiated decomposition of barium and strontium azides |
| title_full_unstemmed | The photolysis and co-irradiated decomposition of barium and strontium azides |
| title_short | The photolysis and co-irradiated decomposition of barium and strontium azides |
| title_sort | photolysis and co irradiated decomposition of barium and strontium azides |
| topic | Chemistry |
| url | http://hdl.handle.net/11427/22404 |
| work_keys_str_mv | AT shephardenidgwendolyn thephotolysisandcoirradiateddecompositionofbariumandstrontiumazides AT shephardenidgwendolyn photolysisandcoirradiateddecompositionofbariumandstrontiumazides |