Local trigonal distortions of some paramagnetic impurity centers in ZnSiF6 · 6H2O crystal

Abstract The trigonal distortions of Ni2+, V2+, Mn2+ and Co2+ ions in ZnSiF6 · 6H2O crystal have been studied by analysing their zero-field splittings and the anisotropy of g factor (characterized by Δg = g ⊥ − g ∥). From the studies, it is found that the sign of trigonal distortion (compression or elongation) of octahedral environment of impurity ion is impurity-dependent, i.e., when the ionic radius of impurity is greater than that of the replaced Zn2+ ion, the octahedral environment of impurity is compressed, whereas if the ionic radius of impurity is smaller than that of Zn2+, it is elongated. This point is similar to the case of isomorphous pure crystal where the paramagnetic ion is the host ion rather than the impurity.

[1]  Z. Wen-chen.  Determination of the local compressibilities for Cr3+ ions in some garnet crystals from high-pressure spectroscopy , 1995 .

[2]  Z. Wen-chen.  Local axial distortion of paramagnetic impurity center in some axial-symmetry crystals , 1995 .

[3]  V. Jain,et al.  Superposition model analysis of zero-field splitting for Mn2+ in some hosts , 1992 .

[4]  J. A. Aramburu,et al.  Impurity-ligand distances derived from magnetic resonance and optical parameters , 1992 .

[5]  Z. Wen-chen.  Explanation of the signs of EPR parameters for 3dn ions in α-LiIO3 crystals from the ligand relaxations due to Li+] vacancies , 1991 .

[6]  W. Zheng.  The method of calculating the spin-lattice coupling coefficients Fij in cubic symmetry from the formulae for the g-factor , 1990 .

[7]  W. Zheng.  Investigation of the Pressure and Stress Dependence of Low‐Temperature EPR Spectra for ZnSiF6 · 6H2O:V2+ Crystals , 1989 .

[8]  A. Marcelli,et al.  Lattice site of manganese in LiNbO3 : An EXAFS study , 1989 .

[9]  W. Zheng.  Calculation of the spin-lattice coupling coefficients in cubic symmetry , 1989 .

[10]  K. Shrivastava.  Electron paramagnetic resonance determination of Debye temperature , 1988, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[11]  Y. Iwasawa,et al.  A structure model as the origin of catalytic properties of metal-doped MgO systems , 1988 .

[12]  Lin,et al.  Ruderman-Kittel-Kasuya-Yosida interaction near the surface of a semi-infinite rare-earth metal. , 1987, Physical review. B, Condensed matter.

[13]  R. D. Shannon.  Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides , 1976 .

[14]  A. Galkin,et al.  Uniform Pressure Effect on Low‐Temperature EPR Spectrum of V2+ Ion in Zinc Fluosilicate , 1975 .

[15]  D. H. Templeton,et al.  Crystal structures of the fluosilicate hexahydrates of cobalt, nickel and zinc , 1973 .

[16]  E. B. Tucker.  Spin-Lattice Coupling of a Kramers Doublet:Co2+in MgO , 1966 .

[17]  S. Clark,et al.  Handbook of physical constants , 1966 .

[18]  E. Feher.  Effect of Uniaxial Stresses on the Paramagnetic Spectra ofMn3+andFe3+in MgO , 1964 .