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<p>The influence of combinations of water-soluble magnesium and aluminum salts on the physicochemical properties of alumina–magnesia spinel was investigated. It was shown that spinel formation occurs in the temperature range of 800 – 1050°C from xerogels prepared from aluminum and magnesium chlorides and nitrates. Complete crystallization of the spinel structure was achieved by thermal treatment of xerogels synthesized from AlCl<sub>3</sub>+ MgCl<sub>2</sub> salts at 900°C with a holding time of 60 min, yielding smaller crystallite sizes compared to other xerogels. In contrast, xerogels synthesized from Al(NO<sub>3</sub>)<sub>3</sub>+ MgCl<sub>2</sub> and Al(NO<sub>3</sub>)<sub>3</sub> + Mg(NO<sub>3</sub>)<sub>2</sub> required higher temperatures (up to 1050°C) for full spinel formation. The results demonstrate that the choice of precursor salts significantly affects the phase formation temperature and crystallite size of MgAl<sub>2</sub>O<sub>4</sub> spinel obtained via the citrate sol–gel route.</p>

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Synthesis of Alumina–Magnesia Spinel from Xerogels Derived from Aluminum and Magnesium Chlorides and Nitrates in the Presence of Citric Acid

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • F. G. Khomidov,
  • Z. R. Kadyrova,
  • Kh. L. Usmanov,
  • Sh. M. Niyazova

摘要

The influence of combinations of water-soluble magnesium and aluminum salts on the physicochemical properties of alumina–magnesia spinel was investigated. It was shown that spinel formation occurs in the temperature range of 800 – 1050°C from xerogels prepared from aluminum and magnesium chlorides and nitrates. Complete crystallization of the spinel structure was achieved by thermal treatment of xerogels synthesized from AlCl3+ MgCl2 salts at 900°C with a holding time of 60 min, yielding smaller crystallite sizes compared to other xerogels. In contrast, xerogels synthesized from Al(NO3)3+ MgCl2 and Al(NO3)3 + Mg(NO3)2 required higher temperatures (up to 1050°C) for full spinel formation. The results demonstrate that the choice of precursor salts significantly affects the phase formation temperature and crystallite size of MgAl2O4 spinel obtained via the citrate sol–gel route.