Yonghe Zhang ionocovalent theory applications (13)
American Huilin Institute, http://www.amhuilin.com/
Based on Zhang ionic-covalency theory  and the Portier ICP , Lenglet proposed  “Ligand field spectroscopy and chemical bonding in Cr3+-, Fe3+-, Co2+- and Ni2+- containing oxidic solids”, referring to influence of the inductive effect of the competing bonds and magnetic ineractions on the degree of covalency of the 3d M-O bonds, it has been shown that for transition metal oxides (3d3, 3d5, 3d7, 3d8, configurations), linear relationships are observed between either interelectronic repulsion or the Racah parameter (RP) and (i) the ionic covalent parameter ICPnn relative to the next nearest cationic neighbors outside the MOn polyhedra, and (ii) the optical basicity ^th calculated from the valence and coordination numbers of the component cations as proposed by Lebouteiller and Courtine .
 Y. Zhang,, Inorg Chem., 1982, 21, 3889.
 J. Portier, G. Campet, J. Etoumeau and B.Tanguy, Alloys Comp.,1994a, 209, 59.
 M. Lenglet, Materials Research Bulletin, 2000, Vol. 35 (4) pp. 531-543.
 A. Lebouteiller, P. Courtine, J. Dolid State Chem, 1998, 137, 94.