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Calorimetric analysis of the system Ag2S–Ag2Se between 25 and 250 °C

Published online by Cambridge University Press:  03 March 2011

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

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 12 , December 1993 , pp. 3126 - 3130
Copyright
Copyright © Materials Research Society 1993

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