Abstract
The partial pressure of Zn over the system including three condensed phases [(In-Zn)-InAs(s)-Zn3As2(s)] has been determined between 617 K and 740 K by optical absorption of a vapor phase at 307.6 nm using a Zn hollow cathode lamp as a source of radiation. The array of experimental data contained 52 values of Zn pressure from 0.32 Pa up to 20 Pa at different temperatures. Using this information the activity of zinc and its mole fraction in metal phase (from 4.6 at.% to 8.3 at.%) were founded. The dependences of ln p and $$ \ln K_{a}^{ \circ } $$ against reciprocal temperature for reaction: 1/3Zn3As2(s) + 2/3In(liquid) = Zn(g) + 2/3InAs(s) were approximated by linear functions. For considered temperature range the standard enthalpy of reaction was calculated as equal to 126 ± 1 kJ/mol.
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