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Solid solutions in the system Ag2S–Ag2Se

Published online by Cambridge University Press:  31 January 2011

N.E. Pingitore,
B.F. Ponce,
M.P. Eastman,
F. Moreno and
C. Podpora
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
M.P. Eastman
Affiliation:
Department of Chemistry, Northern Arizona University, Flagstaff, Arizona 86011
F. Moreno
Affiliation:
Department of Geological Sciences, The University of Texas at El Paso, El Paso, Texas 79968–0555
C. Podpora
Affiliation:
Department of Geological Sciences, The University of Texas at El Paso, El Paso, Texas 79968–0555
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Abstract

Optical, electron microprobe, and x-ray diffraction analysis of 88 samples of various compositions between Ag2S and Ag2Se synthesized at high temperature in sealed quartz tubing indicates the presence of two solid-solution series in this system at ambient (room) conditions. One series extends from Ag2S to approximately Ag2S0.4Se0.7 and has the Ag2S-III-type structure (monoclinic). The second series ranges from Ag2S0.3Se0.7 to Ag2Se and is characterized by the Ag2Se-II-type structure (orthorhombic). Members of both series, in appropriate proportions, characterize the apparent compositional gap between the two solid solutions. Gradual shifts in the locations of the x-ray diffraction peaks along the compositional gradient of each solid solution revealed an expansion of the d-spacing as the larger Se ion was substituted for S in the Ag2S-III-type structure and a contraction as S was substituted for Se in the Ag2Se-II-type structure. The reported discrete phase, Ag4SSe (aguilarite, orthorhombic), appears to be simply a member of the monoclinic Ag2S-III-type solid solution.

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Type
Articles
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Journal of Materials Research , Volume 7 , Issue 8 , August 1992, pp. 2219 - 2224
Copyright
Copyright © Materials Research Society 1992

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