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  • 1 Department of Metallurgy and Metallurgical Engineering University of Utah 84112 Salt Lake City Utah USA
  • 2 Anaconda Copper Co. Box 27007 85726 Tucson AZ
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Decomposition of urea nitrate in an initially evacuated system gave sigmoidal pressurevs. time curves. The experimental kinetic data fit the growing nuclei model with a measured enthalpy of activation of 142±12.5 kJ/mole as compared to 115±11.3 kJ/mole obtained thermogravimetrically. This higher value ofΔH is explained on the basis of two factors: 1) the inhibitory effect of the product gases and 2) self heating, whose extent increasedΔH by about 12.5 kJ/mole.

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