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Chemical stability of CuInS2 in oxygen at 298 K

Published online by Cambridge University Press:  31 January 2011

J. Grzanna  and
H. Migge
J. Grzanna
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Straβe 100, D-14109 Berlin, Germany
H. Migge
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Straβe 100, D-14109 Berlin, Germany
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Abstract

A thermochemical analysis is performed in the quaternary system Cu–In–S–O at 298 K, including the respective four ternaries. The Cu–In phase diagram is updated with respect to the new experimental as well as to the new thermochemical results in the literature. Free energies of In6S7, In2.8S4, CuIn2, and Cu2In2O5 have been estimated. Consistent sets of data are used for the calculations of the ternary systems with the program thermo, and the results are used to calculate the quaternary tetrahedron Cu–In–S–O with the program thermoq; the algorithm is given. Twelve quaternary two-phase equilibria have been found. They are used to calculate predominance area diagrams of the quaternary system with the program stadiaq for different oxygen partial pressures. The algorithm of this program is given. From these diagrams it becomes obvious that CuInS2 is unstable in air and even in UHV systems and should react to form In2(SO4)3 and Cu2S at oxygen pressures larger than log p (pascal) = −51.5. The results are useful for research in fields such as oxidation and crystal growth of CuInS2 and for development of processes for producing this compound.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 355 - 363
Copyright
Copyright © Materials Research Society 1997

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