Hostname: page-component-5c6d5d7d68-thh2z Total loading time: 0 Render date: 2024-08-18T04:22:01.644Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis, Magnetic, Electrical and Mössbauer Investigations on Complex Semiconductors

Published online by Cambridge University Press:  25 February 2011

Hugo Steinfink  and
John Steven Swinnea
Hugo Steinfink
Affiliation:
Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, TX 78712
John Steven Swinnea
Affiliation:
Materials Science and Engineering, ETC 9.104, The University of Texas, Austin, TX 78712
Get access

Abstract

The system Ba-Fe-S contains a phase Ba1+xFe2S4 whose structure consists of infinite chains of FeS4 edge sharing tetrahedra with Fe-Fe distances of 2.7Å. The chains are 6 Å apart and Ba2+ fills the space between the chains. Each value of x designates a distinct phase and such structures have been labeled “infinitely adaptive.” The Ba1+xFe2S4 compounds are anisotropic semiconductors. The room temperature electrical conductivity for the x = 0 and x = 0.086 phases changes by nearly 6 orders of magnitude as increasing x populates the conduction band. The preparation of these materials requires very careful control of sulfur vapor pressure in closed ampules at elevated temperatures. A similar effect is observed in rare earth sulfides with the Th3P4 structure. Intrinsic La2S3 and BaLa2S4 are predicted to be high resistivity semiconductors. As the composition changes to a stoichiometry such as Ba0.8La2.2S4 the behavior becomes semi-metallic. Control of the sulfur vapor pressure will be a critical parameter for designing physical parameters into these compounds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 97: Symposium I – Novel Refractory Semiconductors , 1987 , 371
Copyright
Copyright © Materials Research Society 1987

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

REFERENCES

1. Perng, T.P., Kimizuka, N. and Steinfink, H., J. Solid State Chem, 40, 92 (1981); and references therein.Google Scholar
2. Hoggins, J. T. and Steinfink, H., Acta Crystallogr. B33, 673 (1977).Google Scholar
3. Swinnea, J. S. and Steinfink, H., J. Chem. Education 57, 580 (1980).Google Scholar
4. Swinnea, J. S. and Steinfink, H., J. Solid State Chem. 41, 114 (1982).Google Scholar
5. Nakayama, N., Kosuge, K. and Kachi, S., J. Solid tate Chem. 36, 9 (1981); Chemica Scripta. 20, 147 (1982).Google Scholar
6. Holladay, A. C. and Eyring, L., J. Solid State Chem. 64, 113 (1986).Google Scholar
7. Danielson, L. R., Matsuda, S. and Raag, V., Proceedings 19th Intersociety Energy Conversio nEngineering Conference, San Francisco, CA, 2256–2259, (1984). Published by American Nuclear Society.Google Scholar
8. Schevciw, O. and White, W. B., Mat. Res. Bull. 18, 1059 (1983).Google Scholar