Trends in Applied Sciences Research1819-35792151-7908Science International10.3923/tasr.2006.426.4302 (X = Cl, Br, I)]]>WuShao-Yi GaoXiu-Ying FuQiang LinJi-Zi 4200614The gyromagnetic factors g// and g⊥ for the layered trigonal antiferromagnets VX2 (X = Cl, Br, I) are theoretically investigated by using the perturbation formulas of the g factors for a 3d3 ion in trigonal symmetry based on the cluster approach. In these formulas, the contributions from the s-orbitals of the ligands which were often ignored in the previous treatments are taken into account here. The related trigonal field parameters V and V are determined from the superposition model and the structural data of the systems. The calculated g factors are in good agreement with the observed values, particularly the results for VI2 show some improvement compared with those in the absence of the ligand s-orbital contributions.]]>Bauhofer, W., G. Guntherodt, E. Anastassakis, A. Frey and G. Benede,19802258735873Bondarenko, I.N., R.S. Gekht and V.I. Ponomarev,1996226969Clementi, E. and D.L. Raimondi,19633826862686Du, M.L. and Z.M. Li,1994662796279Du, M.L. and C. Rudowicz,199223 term of Cr3+ clusters with trigonal symmetry: Al2O3, CsMgCl3 and CsMgBr3.]]>4689748974Edgar, A.,1976943034303Van Erk, W. and C. Hass,197571537537Griffith, J.S.,1964Guntherodt, G., W. Bauhofer and G. Benedek,19792 due to modulation of exchange interaction.]]>4314271427Kawamura, H.,198863308630861McPerson, G.L., R.C. Kach and G.D. Stucky,19742+, Mn2+ and Ni2+ in single crystals of CsMgBr3 and CsMgI3.]]>6014241424Newman, D.J. and B. Ng,198952699762Rastelli, E. and A. Tassi,19962 family.]]>7957455745Watabe, Y., T. Suzuki and Y. Natsume,19955234003400Wyckoff, R.W.,1951Vol. 1,Yamada, I., K. Ubukoshi and K. Hirakawa,19842 (X = Cl, Br and I).]]>53381381Yu, W.L., X.M. Zhang, L.X. Yang and B.Q. Zen,19943+ ions at the defect sites in cubic fluoroperovskite crystals.]]>5067566756