Distribution of complexes with divalent nickel Ni2+ in single crystals of lithium-gallium spinel Li0.5Ga2.5O4

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The structural and magnetic nonequivalence of Ni2+ nickel ions in single crystals of lithium-gallium spinel has been studied by Electron Paramagnetic Resonance (EPR). The distribution of ions over sublattices and structurally unequal positions in the unit cell of the crystal lattice of a lithium-gallium spinel single crystal Li0.5Ga2.5O4 is shown. The parameters and properties of materials are determined by this distribution of ions. Two types of centers are formed in a single crystal. Nickel Ni2+ ions are replaced in structurally unequal positions by gallium ions located in a tetrahedral environment and lithium ions located in an octahedral environment. The research can be used to analyze the properties of spinel ferrites and non-monocrystalline materials. The perspective of the work lies in the fact that currently powder materials are usually used in practice. But their properties vary depending on the production technology. Using the example of single crystals, it is shown how the introduced impurity ions are distributed. This distribution occurs uniformly over structurally unequal positions. It should be taken into account that in the case of rapid cooling during the growth of single crystals and films, the ion distribution may be different.

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V. Shapovalov

Galkin Donetsk Institute for Physics and Engineering

编辑信件的主要联系方式.
Email: vashapovalov1@mail.ru
俄罗斯联邦, Donetsk, 283048

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2. Fig. 1. Dependence of the crystal field potential E on the distance R in relative units. The minima are located along the axes of the [111] type. Tetrahedral and octahedral sites with Ni2+ ions in the unit cell are shown.

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3. Fig. 2. The arrangement of the magnetic axes x, y, z of the Cr3+ ion relative to the crystallographic axes of the type [110], [112], [111]. The magnetic field H0 is parallel to the main magnetic axis z of the ion.

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