A THERMODYNAMIC INVESTIGATION OF THE COMPOUNDS IN3SBTE2, INSB AND INTE.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY
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The heats of formation at 78, 195 and 273K of the ternary compound In3SbTe2 based on the elements and based on the binary compounds InSb and InTe were measured. The heats of formation at these temperatures of the binary compounds InSb and InTe based on the elements were also determined. Heat contents and free energies of the three compounds were calculated from 0 to 800K. The free energies of formation, heats of formation and entropies of formation at 298K were calculated. The results show that the ternary compound is metastable with respect to InSb and InTe below 696K, but is stable above that temperature. The weaker bonding of In3SbTe2 results in a positive entropy of formation which with increasing temperature makes increasing negative contributions to the free energy and above 696K renders the compound stable. Author
- Physical Chemistry