Abstract
In this paper we present the photoacoustic spectroscopy of ZnGa 2O 4 with 5 and 10% of Fe 3+. The ZnGa 2O 4 is a normal spinel, with Zn 2+ ions in tetrahedral sites and Ga 3+ ions in octahedral sites. It is expected for these hosts that Fe 3+ ions occupy Ga 3+ sites. Therefore, the optical properties would be associated to an octahedral symmetry. The energy levels were identified and the crystal field and electronic interaction parameters calculated with Tanabe–Sugano matrices for d 5 configuration. We have also studied the dependence of the photoacoustic signal amplitude on the excitation light modulation frequency. Our results indicate that thermal expansion is the predominant phenomenon for the photoacoustic signal generation.
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Schedule a callMore From: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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