ESR Study of Spin Hamiltonian and Crystal Field Energy Levels of Gd3+ in Natural Zircon

Araya Mungchamnankit; Pichet Limsuwan

doi:10.15866/ireche.v8i5.12989

ESR Study of Spin Hamiltonian and Crystal Field Energy Levels of Gd3+ in Natural Zircon

Araya Mungchamnankit⁽¹⁾, Pichet Limsuwan^(2*)

^(*) Corresponding author

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Abstract

X-band ESR spectra of Gd3+ in the unheated zircon and heat-treated zircons in oxygen and argon atmospheres were carried out. The ESR spectra were measured at room temperature with the applied magnetic field parallel and perpendicular to the c-axis [001] of zircon crystal. The crystal filed parameters were calculated by using a numerical diagonalization of the spin Hamiltonian matrix. The results show that B20 is much larger than the other crystal field parameters and slightly difference in each condition of heat treatment. This result reveals that the heat treatment has effect to on nearest neighboring O2- ions of Gd3+ which replaced the Zr4+ site. The energy level diagrams of Gd3+ in unheated zircon, heat-treated zircons in oxygen and argon atmospheres are direct consequence of the crystal field parameters difference.
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Keywords

Crystal Field; Electron Spin Resonance; Natural Zircon

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