Abstract
The effects of the isotopes 14N 15N and/or HD on the structural CsCl⇄NaCl type phase transition temperature of ammonium chloride using 14NH 4Cl, 15NH 4Cl, 14ND 4Cl, and 15ND 4Cl have been studied by thermal analysis, TG-DTA and DSC. The TG-DTA curves revealed that these ammonium chlorides exhibit an endothermic peak in the range 183.8–197.3°C with a good reproducibility in spite of sublimation. The exact transition temperatures of these four ammonium chlorides during heating and cooling were measured by DSC. The endothermic peak temperature became 0.4°C lower by substituting 14N with 15N in 14ND 4Cl, and 2.3 and 8.7°C lower by substituting H with D in 14NH 4Cl and 15NH 4Cl, respectively, while the temperature became 6°C higher by substituting 14N with 15N in 14NH 4Cl. The exothermic peak temperature was reduced by 15.7 and 14.4°C by substituting 14N with 15N and H with D in 14NH 4Cl, respectively.
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