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A microscopic study of synthetic PbS-Rich homologues nPbS-mBi2S3 |
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| Authors: | A Prodan M Bakker M Versteegh B G Hyde |
| Institution: | 1. J. Stefan Institute, E. Kardelj University, Jamova 39, 61000, Ljubljana, Yugoslavia 2. Gorlaeus Laboratories, State University of Leiden, PO Box 9502, 2300 RA, Leiden, The Netherlands 3. Research School of Chemistry, Australian National University, Box 4 PO, 2600, Australian Capital Territory, Australia |
| Abstract: | The PbS-Bi2S3 join was studied up to 25 mole percent Bi2S3 by electron microscopy and diffraction. It was found that Bi2S3 can be incorporated into the PbS matrix by tropochemical twinning, forming isolated {113}PbS microtwins, or after clustering of these defects, lamellar twinned regions. Only two known mineral members of the homologous series (lillianite Pb3Bi2S6 and heyrowskyite Pb6Bi2S9) were found to be stable in this part of the PbS-Bi2S3 join, while irregularly spaced twin bands within these two structures were observed where deviations in the PbS/Bi2S3 ratio from 6/1 and 3/1, respectively, took place. No ordered intergrowth members were found between heyrowskyite and lillianite. The difference between the PbS-Bi2S3 join and the analogous MnS-Y2S3 one was attributed to the lone pair of nonbonded electrons from the Bi3+ ions, which tends to concentrate these ions in the vicinity of the twin planes. |
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