Distribution of Cobalt Co2+ Ions in Single Crystals of Spinel Li0.5Ga2.5O4
The distribution of Co 2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li 0.5 Ga 2.5 O 4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The dis...
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Published in | Physics of metals and metallography Vol. 125; no. 1; pp. 27 - 32 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | The distribution of Co
2+
ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li
0.5
Ga
2.5
O
4
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 Co
2+
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 Co
2+
ions. The Co
2+
ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co
2+
ions have been found and investigated. The
spectrum is attributed to the Co
2+
ion, which replaces the Ga
3+
ion located in a tetrahedral oxygen environment. The spectrum of the
ion located in the crystal field with axial symmetry belongs to the Co
2+
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 Co
2+
ion replacing the Ga
3+
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 Ga
3+
. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells. |
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ISSN: | 0031-918X 1555-6190 |
DOI: | 10.1134/S0031918X23602883 |