Calorimetric analysis of the system Ag2S–Ag2Se between 25 and 250 °C (original) (raw)

Abstract

Differential scanning calorimetry (DSC) demonstrates that compounds in the pseudobinary system Ag2S–Ag2Se undergo rapid, reversible solid-state phase changes at temperatures between approximately 70 and 178 °C. These temperatures vary systematically with composition, with highs at the pure end members, Ag2S (178 °C) and Ag2Se (134 °C), and a low in the compositional range of approximately Ag2S0.4Se0.6 to Ag2S0.3Se0.7 (70 °C). These data are consistent with the presence of two solid solutions in this system at ambient conditions: the Ag2S–III-type, monoclinic, ranging to approximately Ag2S0.4Se0.6 and the Ag2Se-II-type, orthorhombic, extending from Ag2Se to Ag2S0.3Se0.7. Entropies of transition of 6 to 9 e.u. characterize compositions within the Ag2S-III-type solid solution, whereas values of 13 to 16 e.u. mark members of the Ag2Se-II-type solid solution. The high-temperature allotrope is presumably a continuous solid solution between Ag2S-II and Ag2Se-I, which have similar body-centered cubic structures.

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Authors and Affiliations

  1. Department of Geological Sciences, The University of Texas at El Paso, El Paso, Texas, 79968-0555, USA
    N. E. Pingitore, B. F. Ponce & L. Estrada
  2. Department of Chemistry, Northern Arizona University, Flagstaff, Arizona, 86011, USA
    M. P. Eastman
  3. Department of Chemistry, Florida Atlantic University, Boca Raton, Florida, 33431-0991, USA
    H. L. Yuan
  4. Department of Chemistry, The University of Texas at El Paso, El Paso, Texas, 79968-0555, USA
    L. C. Porter & G. Estrada

Authors

  1. N. E. Pingitore
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  2. B. F. Ponce
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  3. L. Estrada
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  4. M. P. Eastman
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  5. H. L. Yuan
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  6. L. C. Porter
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  7. G. Estrada
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Pingitore, N.E., Ponce, B.F., Estrada, L. et al. Calorimetric analysis of the system Ag2S–Ag2Se between 25 and 250 °C.Journal of Materials Research 8, 3126–3130 (1993). https://doi.org/10.1557/JMR.1993.3126

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