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

TATB<br />

4.4 Refractive Index.6 TATB crystals are pleochroic, being colorless parallel to<br />

the X-axis and yellow in the Y-Z plane. They are anisotropic. The indices of refrac-<br />

tion are N, = 1.45, N, = 2.3, and N, = 3.1.<br />

5. THERMAL PROPERTIES<br />

5.1 Phase Change.<br />

% T<br />

60<br />

40<br />

Type<br />

Solid-to-liquida<br />

Solid-to-gash<br />

(vaporization)<br />

Temperature<br />

too<br />

Latent Heat<br />

(kcal/mole)<br />

---<br />

448-449<br />

-_-<br />

___ 40.21<br />

*Determined on a hot bar melting apparatus. Rapid decomposition<br />

was observed in both solid and liquid states.<br />

“Determined from the vapor pressure data listed in Section 5.2.<br />

WAVELENGTH (rm)<br />

WAVE NUMBER (I/cm 1<br />

Fig. 1. Infrared spectrum.<br />

155

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