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Synthesis, Structural and Optical Characterization of II-VI Semiconductors Included in Sodalite-Type Hosts

  • K. L. Moran (a1), W. T. A. Harrison (a1), T. E. Gier (a1), J. E. Mac Dougall (a1) and G. D. Stucky (a1)...

Abstract

Solid-state chemistry has been used to control both the size and the interconnection distance of small II-VI semiconductor moeities incorporated in zeolitic hosts with the sodalite-type structure. Structural characterization was carried out using X-ray Rietveld powder methods, and optical properties of these materials were also measured. These novel materials show quantum superlattice effects as evidenced by blue shifts in their optical absorption spectra.

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1. For a recent review of this area see: Henglein, A., Top. Curr. Chem. 143, 113 (1988).
2. Dougall, J. E. Mac, Eckert, H., Stucky, G. D., Herron, N., Wang, Y., Moller, K., Bein, T., Cox, D., J Am. Chem. Soc. 111, 8006 (1989), and references therein.
3. For a recent review see: Ploog, K., Angew. Chem. Int. Ed. Engl. 27, 593 (1988).
4. Wang, Y., Herron, N., Mahler, W., Suna, A., J. Opt. Soc. Am. B. 4, 808 (1989).
5. Zeolite Y is structurally derived from sodalite units which are joined through double 6 rings, and this arrangement yields the formation of "Supercages" with diameters of 13Å, and pore opening of 8A. Like wise zeolite A is formed by sodalite units, that are joined through double 4 rings, while this arrangement gives rise to the formation of “α” with 4Å openings and 10Å. See Figure 1 for a description of the sodalite structure and for a complete introduction to zeolites see: Breck, D. W., Zeolit Molecular Sives, (John Wiley & Sons, New York, 1974).
6. This composition has previously been reported, JCPDS card #24,1439. The ZnSe boralite and all the mixed systems are reported for the first time.
7. Note that ZnB2O4, JCPDS card #9,107, could not be reproduced by solid state reaction. The stoichiometry to produce ZnB2O4 gave a mixture of ZnO and ZnB4O7 at 600°C as judged by X-ray powder diffraction.
8. Mel'nikov, O. K., Litvin, B. N., and Fedosva, S. P., in Hydrofthermal Synthis of Crystals, edited by lobachev, A. N. (Constilants Bureau, New York, 1971) p. 119.
9. Smith-Verdier, P., S. Garcia-Blanco Z. Kristallogr. 151, 175 (1980).
10. Larson, A. C., Dreele, R. B. Von, GSAS Users Guide, Los Alamos Report, LAUR 86-748 (1988)

Synthesis, Structural and Optical Characterization of II-VI Semiconductors Included in Sodalite-Type Hosts

  • K. L. Moran (a1), W. T. A. Harrison (a1), T. E. Gier (a1), J. E. Mac Dougall (a1) and G. D. Stucky (a1)...

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