التفاصيل البيبلوغرافية
| العنوان: |
Distribution of Cobalt Co2+ Ions in Single Crystals of Spinel Li0.5Ga2.5O4. |
| المؤلفون: |
Shapovalov, V. V., Shapovalov, V. A., Drokina, T. V., Vorotynov, A. M., Val'kov, V. I. |
| المصدر: |
Physics of Metals & Metallography; Jan2024, Vol. 125 Issue 1, p27-32, 6p |
| مصطلحات موضوعية: |
SINGLE crystals, UNIT cell, ELECTRON paramagnetic resonance, CRYSTAL symmetry, SPINEL, LITHIUM niobate |
| مستخلص: |
The distribution of Co2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li0.5Ga2.5O4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The distribution is obtained by a special technology and is manifested in the electron paramagnetic resonance (EPR) spectra. The distribution of Co2+ ions depends on the structural and magnetic nonequivalence. The structural and magnetic nonequivalence causes a multiminimum behavior of the crystal field potential in the unit cells of single crystals at the locations of Co2+ ions. The Co2+ ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co2+ ions have been found and investigated. The spectrum is attributed to the Co2+ ion, which replaces the Ga3+ ion located in a tetrahedral oxygen environment. The spectrum of the ion located in the crystal field with axial symmetry belongs to the Co2+ ion replacing the Li+ ion located in an octahedral oxygen environment. The spectrum of the ion located in a low symmetry crystal field belongs to the Co2+ ion replacing the Ga3+ ion located in an octahedral oxygen environment. The nearest cationic environment of the ion creates rhombic distortions due to the different valence numbers of Li+ and Ga3+. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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