Paper Title:

Studies of the EPR Parameters and Local Structure for the Cu2+ Center in Lanthanum Magnesium Nitrate

Periodical Defect and Diffusion Forum (Volumes 305 - 306)
Main Theme Defects and Diffusion in Metals XII
Edited by David J. Fisher
Pages 85-88
DOI 10.4028/www.scientific.net/DDF.305-306.85
Citation Min Quan Kuang et al., 2010, Defect and Diffusion Forum, 305-306, 85
Online since October, 2010
Authors Min Quan Kuang, Shan Xiang Zhang, Pei Xu
Keywords Cu2+, Defect Structures, Electron Paramagnetic Resonance (EPR), Lanthanum Magnesium Nitrate
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Abstract

The electron paramagnetic resonance parameters (g-factors and the hyperfine structure constants) for the Cu2+ center in lanthanum magnesium nitrate (LMN) are theoretically studied from the conventional perturbation formulas of these parameters for a 3d9 ion in tetragonally elongated octahedra. The studied complex is found to exhibit the slight tetragonal elongation (characterized by the relative elongation ratio ρ  4%) due to the Jahn-Teller effect, which may entirely conceal the original trigonal distortion of the host Mg2+ site in LMN. The conventional formulas containing only the metal orbital and spin-orbit coupling contributions are proved to be valid for the Cu2+ center in view of the weak covalency and ligand spin-orbit coupling interactions. This defect is also compared with the similar Cu2+ center of the Jahn-Teller nature on the octahedral interstitial site in the CdSe nanocrystals.