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Quantitative Determination of ε‐phase in polymorphic HNIW using X‐ray Diffraction Patterns
Author(s) -
Chen Huaxiong,
Chen Shusen,
Li Lijie,
Jin Shaohua
Publication year - 2008
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.200700228
Subject(s) - diffraction , analytical chemistry (journal) , phase (matter) , materials science , internal standard , x ray crystallography , intensity (physics) , particle size , chemistry , chromatography , optics , physics , detection limit , organic chemistry
An X‐ray diffraction method was applied for the quantitative determination of the ε‐Hexanitrohexaazaisowurtzitane (HNIW) in polymorphs of HNIW. The XRD patterns of four polymorphs illustrate the unique nonoverlapping peak at 19.9° which belongs to ε‐HNIW. The intensity ratio of the peak at 19.9° of ε‐HNIW to the peak at 79.6° of α‐Al 2 O 3 is proportional to the weight ratio of standard ε‐HNIW to the internal standard of α‐Al 2 O 3 , which enables the internal standard method. When the particle size of the sample is less than 10 μm, the content of ε‐HNIW ranging from 70 to 100 wt.‐% can be determined with an absolute error below 2.0%.