Abstract

Samples of a solid solution aluminum oxonitride (γ-AlON) of spinel structure with different ratios of components (Al₂O₃ and AlN) were prepared by the sol–gel technique combined with high-temperature solid-state synthesis at 1750°C in a nitrogen atmosphere. The X-ray diffraction study of polycrystalline samples was performed by the Rietveld method. It was shown that the crystal structure of γ-AlON can be described by the model of permanent anions. The occupancies of tetrahedral and octahedral positions by aluminum atoms in the cationic sublattice of spinel are less than one, and the vacancies are predominantly located in octahedral positions. The lattice constant of the spinel phase (7.9499 Å) in the sample with 67 mol % of Al₂O₃ and the near-stoichiometric composition Al₂₃O₂₇N₅, almost coincides with early published data. The spinel parameter u slightly depends on the concentration and is equal to ∼0.3810.

中文翻译：

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γ-氧氮化铝固溶体的合成及X射线衍射研究

摘要

通过溶胶-凝胶技术结合高温固相合成在1750°C下制备了尖晶石结构具有不同比例的组分（Al ₂ O ₃和AlN）的固溶体氧氮化铝（γ-AlON）样品。氮气氛。多晶样品的X射线衍射研究通过Rietveld方法进行。结果表明，γ-AlON的晶体结构可以用永久性阴离子模型来描述。铝原子在尖晶石的阳离子亚晶格中占据的四面体和八面体位置小于1，并且这些空位主要位于八面体位置。含有67 mol％Al ₂ O ₃的样品中尖晶石相的晶格常数（7.9499Å）化学计量接近的成分Al ₂₃ O ₂₇ N ₅几乎与早期公布的数据一致。尖晶石参数u略微取决于浓度，约等于0.3810。