X-ray diffraction studies on nitric acid dihydrate

被引：28
|
作者：
Tizek, H [1 ]
Knözinger, E [1 ]
Grothe, H [1 ]
机构：
[1] Vienna Univ Technol, Inst Mat Chem, A-1210 Vienna, Austria
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2002年 / 4卷 / 20期
关键词：
D O I：
10.1039/b206644k
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Amorphous nitric acid hydrates in the concentration range 25 to 50 mol% HNO3 were prepared by low-temperature quenching of the respective HNO3/H2O aerosols. Subsequently, a properly selected thermal treatment enabled the phase distribution of two thermodynamically stable ( NAM, beta-NAT) and three metastable phases (alpha-NAD, beta-NAD, alpha-NAT) to be determined between 180 and 232 K by X-ray powder diffractometry. The intriguing phase distribution of the two nitric acid dihydrates was interpreted on the basis of the classical nucleation theory and Ostwald's step rule using known crystallographic data on alpha- and beta-NAD.
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页码：5128 / 5134
页数：7
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