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Jahn-Teller EPA spectra of Cu2 + in MgSif6.6H20

Rubins, R. S. and Tello, Lucio N. and De, Dilip Kumar and Black, T. D. (1984) Jahn-Teller EPA spectra of Cu2 + in MgSif6.6H20. Journal of Chem. Phys. , 81 (10). pp. 4230-4233.

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Abstract

The 34 GHz EPR spectrum ofCu2+ in MgSiF6-6H20 showed a "static" Jahn-Teller effect at 4.2 K with two inequivalent Jahn- Teller sites per unit cell. The six axially symmetric sets of Cu2+ lines had their z axes parallel to the three tetragonal axes of two cubes, which were rotated by approximately 40" with respect to each other about a common (Ill) axis, which is the crystal c axis. The measured spin-Hamiltonian parameters at 4.2 K for each set of lines were g11 = 2.47 ± 0.01, g1 = 2.10 ± 0.01 , and lA 11 1 = (110 ± 3)X 10- 4 em- •. There was a gradual decrease in the anisotropy of the spectrum on warming the crystal, with a single, nearly isotropic line being observed above 220 K. At 270 K the spectrum had axial symmetry about the c axis with Kn = 2.23 ± 0.01 and g~ = 2.25 ± 0.01 . The temperature evolution of the spectrum was interpreted in terms of a Boltzmann distribution over inequivalent distorted Jahn-Teller configurations, with one potential well lowered by an amount L1:::::: I 05 em- 1 below the other two.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User: Mrs Patricia Nwokealisi
Date Deposited: 13 Aug 2015 08:50
Last Modified: 13 Aug 2015 08:50
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/5403

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