1Arakawa M, Okamoto A,Ebisu H, et al. An electron paramagnetic resonance study of Fe^3+ centres in T12 MgF4 and T12 ZnF4 crystals[J]. J Phys:Condens Matter,2006,18:3053--3067.
2Rodnguez F, Moreno M. Dependence of the optical spectrum of MnF on the Mn^2+-F^- distance[J]. J Chem Phys, 1986,84:692--697.
3Jiao Z Y,Kuang X Y,Ma S H,et al. An investigation of the EPR zero field splitting of Fe^3+ ions at tetragonal sites in Tl2MgF4 and Tl2 ZnF4 erystals[J]. Chem Phys Lett, 2007,438 : 254-- 258.
4Jiao Z Y,Kuang X Y, Ma S H, et al. Theoretical investigation of local lattice structure of the tetragonal FeF5 O cluster in KMgF31Fe^3+ crystal[J]. J Alloys Compd,2008,458 : 548--552.