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New data on the composition of the crystalline phases in the Cu-Te-O system

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Abstract

With the help of X-ray microanalysis and X-ray analysis new data about the composition of the crystal phase in the Cu-Te-O system have been obtained. The data from the X-ray microanalysis were treated by the method of the number of the oxygen atoms, and the chemical formulae of the crystal phases were evaluated. The following phases were established: the real composition of the stoichiometric composition 2TeO2 · CuO corresponds to the crystalline phase 5TeO2 · 2CuO with variable composition in the limits from 7TeO2 · 3CuO to 11TeO2 4CuO with X-ray data presented as 2TeO2 · CuO phase. The composition TeO2 · CuO corresponds to a crystalline phase from TeO2 · CuO to 6TeO2 · 5CuO. From a melt of TeO2 · CuO composition overcooled and crystallized is formed 5CuO · 2TeO2. At a given composition 3CuO · TeO2 or 3CuO · TeO3 corresponds to the crystalline phase 5CuO · 2TeO3 with two polymorphic modifications — cubic and tetragonal. The X-ray data obtained in the present investigation and those in literature are accepted to correspond to two polymorphic forms.

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Authors and Affiliations

  1. Higher Institute of Chemical Technology, 1756, Sofia, Bulgaria

    D. Stavrakeva & Y. Ivanova

  2. Scientific Manufacturing Enterprise of Electrothermics, 1870, Sofia, Bulgaria

    Y. Pyrov

Authors
  1. D. Stavrakeva
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  2. Y. Ivanova
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  3. Y. Pyrov
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Stavrakeva, D., Ivanova, Y. & Pyrov, Y. New data on the composition of the crystalline phases in the Cu-Te-O system. J Mater Sci 25, 2175–2180 (1990). https://doi.org/10.1007/BF01045785

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  • DOI: https://doi.org/10.1007/BF01045785

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