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

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.

• Periodical: Defect and Diffusion Forum (Volumes 305-306)
• Pages: 85-88
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.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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