Effect of method of crystallization on the IV-III and IV-II polymorphic transitions of ammonium nitrate

被引：31
|
作者：
Vargeese, Anuj A. [1 ]
Joshi, Satyawati S. [1 ]
Krishnamurthy, V. N. [1 ]
机构：
[1] Univ Poona, Dept Chem, Pune 411007, Maharashtra, India
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2009年 / 161卷 / 01期
关键词：
Ammonium nitrate; Crystallization; Hydroxylammonium nitrate; Morphology; Moisture absorption; THERMAL-PROPERTIES; PHASE-TRANSITION; TRANSFORMATIONS; DSC; MOISTURE;
D O I：
10.1016/j.jhazmat.2008.03.108
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A study has been undertaken on the effect of crystallization method on the IV double left right arrow III transition of ammonium nitrate (AN). AN is crystallized in three different ways, viz. recrystallization, evaporative crystallization and melt crystallization. When the samples were crystallized from Saturated aqueous solution, ideal crystals were formed, which behaved differently from the crystals formed from the other methods. The DTA examination of the crystals showed that the crystals have different transition behaviour. The moisture uptake of the samples determined were found to have influenced by the mode of crystallization. The samples were further analyzed by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The present study showed that the parameters like thermal history, number Of previous transformations and moisture content have a very negligible influence oil the IV III transition of AN as compared to the method of crystallization. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：373 / 379
页数：7
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