Low temperature and pressureless synthesis of MgAlON: qualitative analysis and formation evolution

Abstract By calculating the Gibbs free energy of a magnesium aluminium oxynitride (MgAlON) system, pure MgAlON was obtained by pressureless sintering at 1 570 °C in a nitrogen atmosphere using Al, Al2O3, and MgO as raw materials. The formation mechanism of MgAlON and phase evolution of the Al-Al2O3-MgO-N2 system were investigated. The aluminium was melted at approximately 660 °C and formed AlN in the range 740- 1 250 °C. The reaction of AlN, Al2O3, and MgO started to form a primary crystalline MgAlON phase at 950 °C, and as the temperature increased, the minerals continuously dissolved in the primary crystalline phase.

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