Journal of Thermal Analysis and Calorimetry

, Volume 55, Issue 3, pp 903–918

Phase Modification of Ammonium Nitrate by Potassium Salts

  • C. Oommen
  • S. R. Jain

DOI: 10.1023/A:1010146203523

Cite this article as:
Oommen, C. & Jain, S.R. Journal of Thermal Analysis and Calorimetry (1999) 55: 903. doi:10.1023/A:1010146203523


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°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°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.

ammonium nitrate phase modification potassium salts 

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • C. Oommen
    • 1
  • S. R. Jain
    • 1
  1. 1.Department of Aerospace EngineeringIndian Institute of ScienceBangaloreIndia

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