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Title: Photochemical and thermal decomposition of solids
Author: Yoganarasimhan, Singapuram Raghavachar
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1968
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As a result of the recent investigations of Torkar and coworkers on the phase diagram of barium azide and water, anhydrous barium azide with different physical properties can now be prepared. A review of the literature on decomposition of barium azide showed that the decomposition is very sensitive to the method of preparation, age, ambient atmosphere etc. So, a reinvestigation of photochemical and thermal decomposition of barium azide prepared from dehydration of the BaN6 . 1.5 H2O and BaN6 . H2O, and by direct crystallization of anhydrous BaN6 above 54°C, has been undertaken. The rates of photolysis of the three samples of BaN6 at constant temperature and intensity decrease with the progress of photolysis. From a study of the rate of photolysis after switching the ultraviolet light off, it was deduced that diffusion of nitrogen is the rate controlling process. As a result the decrease in the photolysis rate is ascribed to the slow rate of diffusion of diffusion through the product phase. The diffusion equation (Fick's second law) has been solved with suitable boundary conditions to express the photolysis of barium azide as P = at + b/t.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available