Solubility Limit of MgO in Al ₂ O ₃ at 1600°C

Abstract

The solubility of Mg in alumina was measured using wavelength‐dispersive spectroscopy mounted on a scanning electron microscope. Careful calibration of the microscope's working conditions was performed in order to optimize the detection limit and accuracy. Measurements were conducted on water‐quenched and furnace‐cooled samples, without any thermal or chemical etching to avoid alteration of the bulk concentration. The results indicate the solubility limit of Mg in alumina to be 132±11 ppm at 1600°C.