Abstract
The Newman superposition model has been applied to the second-order zero-field splitting parameter b 0 2 taken from the literature for Mn 2+ in scheelite, Ca 5(PO 4) 3F, Mg(OMPA) 3(ClO 4) 2, metal hexakisantipyrine perchlorate and A 2CdCl 4 (A = Cs, Rb). In the calculations, the local lattice relaxation has been taken into account. It is shown that nearly the same value as the intrinsic parameter b̄ 2 is obtained in the case of scheelite and the Mg host. In the other hosts, where Mn 2+ substitutes for the same cation, different values of b̄ 2 are obtained. It appears that drastic local lattice relaxation occurs in Pb hexakisantipyrine perchlorate.
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