EPR investigation of local structure for the [Mn(H2O)6]2+ cluster in M(ClO4)2 · 6H2O:Mn2+ (M = Cd, Hg) systems at different temperatures
School of Science, Southwest Petroleum University, Chengdu 610065, P.R. China
2 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P.R. China
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Accepted: 5 January 2015
Published online: 14 August 2015
Local lattice structure distortion studies of the octahedral Mn2+ center in M(ClO4)2 · 6H2O:Mn2+ (M = Cd, Hg) systems have been performed systematically based on the diagonalization of the complete energy matrices of electron-electron repulsion, spin-orbit coupling and trigonal ligand-field interaction for a d5 configuration ion in a trigonal ligand field. From the EPR calculation, the local structure distortion parameters R and θ are determined, respectively. Results show that the local lattice structure around a trigonal Mn2+ center has a compressed distortion along the crystalline C3 axis. The compression distortion may be ascribed to the fact that the radius of the Mn2+ ion is smaller than that of the Hg2+ ion and the Cd2+ ion. The local lattice structure parameters for Mn2+ in M(ClO4)2 · 6H2O:Mn2+ (M = Cd, Hg) systems are determined at liquid-nitrogen temperature and room temperature.
© EDP Sciences, 2015