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Phase transitions of ammonium nitrate doped with alkali nitrates studied with fast x-ray diffraction.

Phasenübergänge bei mit Alkalinitraten versetztem Ammoniumnitrat unter Einsatz der schnellen Röntgenbeugung
: Deimling, A.; Eisenreich, N.; Engel, W.


Journal of thermal analysis 38 (1992), S.843-853
ISSN: 0368-4466
Fraunhofer ICT ()
alkali nitrate; ammonium nitrate; phase transformation; x-ray diffraction

Dried samples of ammonium nitrate (AN) containing 1, 3, 5 mol% KNO3, RbNO3 and CsNO3 were investigated with temperature resolved X-ray diffraction. The samples were cycled with 2 temperature programs from minus70 degree to 100 degree and minus70 degree to 150 degree C, resp. DSC measurements were made for comparison. KNO3 extends the stability range of phase 3. The supercooling observed with the transitions 2/3 and 3/4 was so severe that the phases 3 and 4 could be skipped leading to the transitions 2/4 and 3/5. No hindered nucleation was observed on heating. RbNO3 gives dried AN the properties of the humid nitrate. Phase 3 appeared on heating but was skipped on cooling, when the sample had been heated to 150 degree C. Hindered nucleation was observed. CsNO3 stabilizes the phases 2 and 5. No strong hysteresis or supercooling was observed.