It was found that the lattice parameters of the ternary chalcogenide network CdSSe were increased with increasing Se content instead of S. Do you have an explanation?
The ionic radii of Se is larger, than that of S, which can be seen from the position of Se in relation to S in the periodic table of elements.
If you want to cite anything, maybe cite this paper by shannon:
http://scripts.iucr.org/cgi-bin/paper?a12967
The data (including some additional papers) are nicely summarized here:
http://abulafia.mt.ic.ac.uk/shannon/ptable.php
The ionic radii of Se is larger, than that of S, which can be seen from the position of Se in relation to S in the periodic table of elements.
If you want to cite anything, maybe cite this paper by shannon:
http://scripts.iucr.org/cgi-bin/paper?a12967
The data (including some additional papers) are nicely summarized here:
http://abulafia.mt.ic.ac.uk/shannon/ptable.php
Michael is complety right: The change in the lattice parameters due to slight changes in the atomic concentrations is described by the Vengard's rule (not sure if there exists a formula for ternary of higher compounds). It includes the concentrations and the atomic radi or lattice paremeters. Furthermore the change of the lattice parameters is commonly used to estimate solubility ranges in phase diagrams via Vengards rule.
If you observed this change in your XRD scan you can estimate the atomic occupancy or the substitution of S by Se using Rietveld refinement.
Thanks alot Michael and Martin for your valuable and useful answers .
Dear Hassanien
Increasing lattice parameter derive from many factors like : external energy or tension that could effect on the parameters. or stretching that or sth like that , could effect directly on changing the lattice parameters.
If solid solution is formed { in conditions r(se)>r(s)) you will see your lattice parameter increase.
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