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Untitled - Sciencemadness Dot Org

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4.2 Density.’<br />

Method of<br />

Determination State a<br />

Density<br />

(g/cm”)<br />

P - Y<br />

6<br />

__<br />

X-ray Solid 1.838 1.902 1.78 1.786<br />

Direct measurement Solid 1.84 1.905 1.76 1.80<br />

HMX<br />

HMX cannot be consolidated into charges by conventional pressing. Obtaining<br />

large pieces of polycrystalline HMX requires solvent pressing techniques.<br />

4.3 Infrared Spectrum. See Fig. 1.<br />

4.4 Refractive Index.’ The refractive indices of the four polymorphs in sodium<br />

light are shown.<br />

Face a B<br />

HMX Polymorph<br />

Alpha 1.561-1.565 1.589<br />

Beta 1.562-1.566 1.594-1.595<br />

Gamma 1.720-1.740 1.730-1.773<br />

Epsilon<br />

Omega<br />

Double<br />

refraction<br />

2.5<br />

__-<br />

___<br />

Pas<br />

WAVELI ENGTH<br />

6<br />

li<br />

16OC<br />

I (pm)<br />

WAVE NUMBER (I/cm 1<br />

6<br />

___<br />

___<br />

Pas<br />

14<br />

Y 6<br />

1.537 _-_<br />

1.585 _-_<br />

1.666 __-<br />

___ 1.566<br />

_-_ 1.607<br />

Pas neg<br />

Fig. 1. Infrared spectrum.<br />

45

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