Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-23T10:42:43.286Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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.

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Junod, P., Helv. Phys. Acta 32, 567 (1959).Google Scholar
2.Conn, J. B. and Taylor, R. C., J. Electrochem. Soc. 107, 977 (1960).CrossRefGoogle Scholar
3.Yokata, I., J. Phys. Soc. Jpn. 16, 2213 (1961).CrossRefGoogle Scholar
4.Yokata, I., J. Phys. Soc. Jpn. 21, 420 (1966).CrossRefGoogle Scholar
5.Baer, Y. von, Busch, G., and Frohlich, C., Zeit. Naturforschg. 171, 886 (1962).CrossRefGoogle Scholar
6.Rahlfs, P., Zeit Physikal. Chem. B-312, 157 (1936).CrossRefGoogle Scholar
7.Kracek, F. E., Trans. Am. Geophys. U. 27, 364 (1946).Google Scholar
8.Ramsdell, L. S., Am. Mineral. 28, 401 (1943).Google Scholar
9.Early, J. W., Am. Mineral. 35, 337 (1950).Google Scholar
10.Boettcher, A. von, Haase, G., and Treupel, H., Zeit. Ang. Phys. 7, 478 (1955).Google Scholar
11.Weigers, G. A., Am. Mineral. 56, 1882 (1971).Google Scholar
12.Petruk, W., Owens, D. R., Stewart, J. M., and Murray, E. J., Can. Mineral. 12, 365 (1974).Google Scholar
13.Bontschewa-Mladenowa, Z. and Zaneva, K., Z. anorg. allg. Chem. 437, 253 (1977).CrossRefGoogle Scholar
14.Bontschewa-Mladenowa, Z. and Vassilev, V., J. Therm. Anal. 29, 523 (1984).Google Scholar
15.Roy, R., Majumadar, A. J., and Hulbe, C. W., Econ. Geol. 54, 1278 (1959).CrossRefGoogle Scholar
16.Banus, M. D., Science 147, 732 (1965).CrossRefGoogle Scholar
17.Morales, L. F. V. and Borodayev, Y. S., Dok. Akad. Nauk SSSR 264, 685 (1982).Google Scholar
18.Ponce, B. F., Pingitore, N. E., and Moreno, F., Geol. Soc. Amer. Ann. Mtg. (San Diego), Abstr. Prog., #23741 (1991).Google Scholar
19.Pouchou, J. L. and Pichoir, F., in Electron Probe Quantitation, edited by Heinrich, K. F. J. and Newbury, D. E. (Plenum Press, New York, 1991), p. 31.CrossRefGoogle Scholar
20. Joint Committee on Powder Diffraction Standards, International Centre for Diffraction Data, 1601 Park Lane, Swarthmore, PA 19081–2389.Google Scholar
21.Shannon, R. D., Acta Cryst. A-32, 751 (1976).CrossRefGoogle Scholar