For example rare earth elements (La series) doping in Cd+2 compounds.
yes, sometimes. Note that ionic radii are not that usefull when working with solids, you should rather uses crystal radii (cf. table of shannonradii, which are valence and coordination dependent).
The only way you may have a pre-experiment guess on the fact if an ellemt may be used as a dopant is through QM calculations, this may give you an indication. However even if the calculations says the dopant may not like to homogeneously distributed in a material, experiments may still show dissolution of the dopant. In such a case the dopant either forms clusters or remains in the surface region of the material.
(cf group IV doping in CeO2: http://onlinelibrary.wiley.com/doi/10.1111/jace.12650/abstract )
Dear Dr Sharma,
I prefer to do some QM calculations for investigate possibility of this doping. For example, you can studying thermodynamically phase diagram by using DFT calculations and find that this doping is possible.
answer is yes, however expect some solubility limitations in final solid solution resulting in phase separation. We do such things on daily laboratory basis. You can check some of our publications.
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