Accession Number:

AD0620980

Title:

PARTIAL PRESSURES OF HG(G) AND TE2(G) IN HG-TE SYSTEM FROM OPTICAL DENSITIES,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

Report Date:

1964-11-24

Pagination or Media Count:

15.0

Abstract:

The partial pressures of Hgg and Te2g in equilibrium with Hg-saturated HgTec, Te-saturated HgTec, and some Hg-Te melts between about 400 and 700C were determined by measuring the optical density of the coexistent vapor as a function of wavelength. In agreement with mass spectrographic data, no evidence was obtained for HgTeg molecules. The partial pressures of the elements depend strongly on the composition of the solid phase. The maximum value of pHg in equilibrium with HgTec is 19 atm, the pressure over Hg-saturated HgTec between 643 and 656C. At 670C, the maximum melting point, pHg 12.5 atm. At any temperature Hgg is the predominant vapor species over HgTec of any composition. Liquidus temperatures for compositions between 31 and 58.5 at. Te have been obtained from the partial pressure data, which also show that at 488C Hg-saturated HgTec contains 49.90.2 at. Te and Te-saturated HgTe c contains less than 50.5 at. Te. The Gibbs free energy of formation of HgTec from Hgg and Te2g, which is practically independent of the composition of the solid phase, is found to be -41.6642.71 0.001 T kcalmole. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE