Phase modification of ammonium nitrate by potassium salts

Oommen, C and Jain, SR (1999) Phase modification of ammonium nitrate by potassium salts. In: Journal of Thermal Analysis and Calorimetry, 55 (3). 903-918 .

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Abstract

Modification of the room temperature phase (IV-III) of ammonium nitrate (AN) has been attempted using a variety of potassium salts namely, KF, KCl, KI, KNO3, K2CO3, K2SO4, KSCN and K2Cr2O7. No phase transition was observed when AN containing 1-2% by mass of these potassium salts is heated from room temperature (25 degrees C) onwards in DTA and DSC scans, but the linear expansion due to phase transition was still observable in TMA measurements. Complete arrest of the linear expansion occurs only when a higher concentration of the additive is used. Similarly, in thermal cycling experiments, complete phase modification in the temperature range -80 to 100 degrees C occurs only with a higher percentage of the potassium salt. The extent of modification, however, is found to be dependent both on the concentration, and the type of the anion. Potassium dichromate when used as an additive modifies the phase as well as the decomposition pattern of AN.

Item Type:	Journal Article
Publication:	Journal of Thermal Analysis and Calorimetry
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	28 Jun 2011 10:14
Last Modified:	28 Jun 2011 10:14
URI:	http://eprints.iisc.ac.in/id/eprint/38713

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