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Analysis of trigonal distortions in Cs2Na(Al, Ga)F6:Cr3+ using experimental EPR data

M. G. BRIK1,2, N. M. AVRAM3,*

Affiliation

  1. Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo-ku, Kyoto, 606-8103, Japan
  2. School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
  3. Department of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300223, Timisoara, Romania

Abstract

Using the latest experimental data on electron paramagnetic resonance (EPR) measurements for the Cr3+ centers in Cs2Na(Al, Ga)F6 crystals we derive from the values of the trigonal field parameters, the angles between the C3 axis and Cr3+ - F- chemical bonds and relate the signs of the trigonal field parameters to the character of the trigonal deformation. The spin Hamiltonian (SH) parameters (zero-field splitting D, anisotropic g factors g and g ,) for trigonal Cr3+ centers in Cs2Na(Al, Ga)F6 are theoreticaly investigated by using the perturbation formulas for a 3d3 ion in a trigonal symmetry. The calculated SH parameters based on the local geometry are in good agreement with those deduced from the experimental EPR measurements..

Keywords

Cr3+ center, Cs2Na(Al, Ga)F6, trigonal distortion, EPR (ESR) data.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

M. G. BRIK, N. M. AVRAM, Analysis of trigonal distortions in Cs2Na(Al, Ga)F6:Cr3+ using experimental EPR data, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 102-106 (2006)