Sol–Gel Synthesis of Magnesium Aluminate Spinel as Influenced by Y 2 O 3  and Eu 2 O 3  Additions

F. G.  Khomidov; Хомидов Ф. Г.; Z. R. Kadyrova; Кадырова З. Р.; Kh. L. Usmanov; Усманов Х. Л.; Sh. M. Niyazova; Ниязова Ш. М.

doi:10.31857/S0002337X23060167

Sol–Gel Synthesis of Magnesium Aluminate Spinel as Influenced by Y₂O₃ and Eu₂O₃ Additions

Authors: Khomidov F.G.¹, Kadyrova Z.R.¹, Usmanov K.L.¹, Niyazova S.M.¹
Affiliations:
1. Institute of General and Inorganic Chemistry, Academy of Sciences of Uzbekistan
Issue: Vol 59, No 6 (2023)
Pages: 654-661
Section: Articles
URL: https://journals.rcsi.science/0002-337X/article/view/140193
DOI: https://doi.org/10.31857/S0002337X23060167
EDN: https://elibrary.ru/EWFQQC
ID: 140193

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Abstract

Magnesium aluminate spinel has been prepared by sol–gel synthesis. We have studied the effect of europium and yttrium oxides on the synthesis of magnesium aluminate spinel and kinetics of spinel formation during heat treatment in the temperature range 500–1000°C. According to X-ray diffraction and chemical analysis data, the formation of magnesium aluminate spinel from a dried xerogel prepared from a mixture of the Al(NO3)3 and Mg(NO3)2 compounds in the ratio 2 : 1, respectively, occurred at a temperature of 1000°C and a firing time of 240 min. The resultant material contained free MgO as an impurity phase. The addition of 1.5 wt % Eu2O3 relative to the total weight of the starting mixture reduced the peak spinel formation temperature to 900°C at a firing time of 240 min. In the case of Y2O3, the addition of 3 wt % was needed to maximize spinel formation at this temperature.

Keywords

phase formation, homogenization, firing, mineralizing additives, reaction acceleration

References

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