EPR Spectra of Cr3+ Ions in Sr3Ga2Ge4O14:Cr Single Crystals |
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Authors: | A. A. Sel'skii |
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Affiliation: | (1) Podol'e Technological University, 11 Institutskaya Str., Khmel'nitskii, 29016, Ukraine |
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Abstract: | The results of investigations of chromiumdoped Sr3Ga2Ge4O14 single crystals by the EPRspectroscopy method are presented. It is shown that activating chromium ions form Cr3+ Ga3+ (Ge4+) substitution centers in the 1aoctahedral positions of the lattice of Sr3Ga2Ge4O14. Depending on the combination of occupation of the 3ftetrahedral positions of the first cationic coordination sphere by Ga3+ and Ge4+ ions, Cr3+ centers of two types are formed. Their individual magnetic spectra are characterized by axial and rhombic symmetry. The magnetic multiplicity of the axialsymmetry spectrum is equal to unity. There exist rhombicsymmetry centers of two types differing in the orientation of the principal magnetic axes and the value of the spinHamiltonian parameter E. The magnetic multiplicity of the individual magnetic spectra of rhombic centers of each type is equal to three. The detected EPR spectra of Cr3+ ions have been described by the spin Hamiltonian of rhombic symmetry. Its parameters and their spread have been determined. |
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Keywords: | EPR spectroscopy disordered crystal structure spin Hamiltonian inhomogeneous broadening Sr3Ga2Ge4O14:Cr crystals activating ions |
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