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Facile synthesis of MgAl 2 O 4 with high crystallinity from KCl–MgCl 2 composite molten salts.

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    • Abstract:
      MgAl2O4(MA) powder has been synthesised by heating an equimolar composition of commercial Al2O3and calcined MgO via a molten salt synthesis (MSS) method. Phase compositions, microstructures, elements distributions, particle size and specific surface area of as-synthesised MA at various temperatures were investigated. The synthesis reaction of MA from Al2O3and MgO is incomplete at 1000 and 1100°C for 4 h in KCl–MgCl2molten salts. MgAl2O4powder can be produced via the MSS method at 1200°C for 4 h, which is ∼200°C lower than that of conventional solid–solid reaction (SSR) method. Fine MA particles can be formed at 1000, 1100 and 1200°C for 4 h, and most of them aggregate. With the increase in reaction temperature from 1000 to 1200°C, the particle size of as-synthesised MA powder decreases and specific surface area increases. The average grain size and the specific surface area of the fabricated powder at 1200°C for 4 h are 7.57 μm and 0.7566 m2 g-1, respectively. Single MA crystalline phase is detected when MA powder formed at 1200°C for 4 h was further heated at 1580°C for 4 h. The MA particles, synthesised at 1000–1200°C after the heat treatment at 1580°C for 4 h, exist in spherical shape with high crystallinity and their grain size is about 2–5 μm. [ABSTRACT FROM AUTHOR]
    • Abstract:
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