Abstract
On the basis of experimental observation of the opposite preferential occupation of the two symmetrically different Cd 2+ sites by Co 2+ and Mn 2+ ions in CsCdCl 3, a rule taking into account the symmetry of both the electronic configuration of the substituting ion and the local receiving site is derived. The chief parameter is the orbital degeneracy of the ground state; a singlet leads to a preferential occupation of cubic octahedral sites, whereas a triplet leads to a settlement in the axially distorted sites. Doublet states unsplit by trigonal symmetry seem to give rise to spontaneous Jahn-Teller effects. This rule could be checked for most transition metal ions of the fourth row of the periodic table.
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