Abstract

Samples of the initial composition Mg_1 – xNi_xGa₂O₄ (0 ≤ х ≤ 1, step х = 0.1) synthesized by the gel combustion method and annealed at 1000°C have been studied by X-ray powder diffraction and IR spectroscopy. For homogeneous samples of (Mg,Ni)Ga₂O₄ with a spinel structure, the gallium nonstoichiometry has been determined by inductively coupled plasma atomic emission spectrometry. Within the framework of the MgO–NiO–Ga₂O₃ system, the boundary of the homogeneity region of spinel (Mg,Ni)Ga₂O₄, which is in equilibrium with halite (Mg,Ni)O, has been outlined. An analysis of the diffuse reflectance spectra of (Mg,Ni)Ga₂O₄ in the range of 350–900 nm revealed intense absorption bands from Ni²⁺ in octahedral positions and showed an increase in their intensity with an increase in the nickel content in the spinel.

中文翻译：

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MgO-NiO-Ga2O3体系中具有尖晶石结构的固溶体

摘要

通过凝胶燃烧法合成并在 1000°C 退火的初始成分 Mg _{1 –  x} Ni _x Ga ₂ O ₄ (0 ≤ х ≤ 1, step х = 0.1) 的样品已通过 X 射线粉末衍射和 IR 进行了研究光谱学。_{对于具有尖晶石结构的(Mg,Ni)Ga 2} O ₄均质样品，镓的非化学计量比已通过电感耦合等离子体原子发射光谱法确定。在MgO-NiO-Ga ₂ O _{3体系的框架内，尖晶石(Mg,Ni)Ga 2} O ₄的均质区边界，它与岩盐 (Mg,Ni)O 处于平衡状态，已被概述。_{(Mg,Ni)Ga 2} O ₄在 350-900 nm 范围内的漫反射光谱分析揭示了 Ni ²⁺在八面体位置的强烈吸收带，并且随着镍含量的增加，它们的强度增加在尖晶石中。