Fig. 4From: Temperature dependent control of the solubility of gallium nitride in supercritical ammonia using mixed mineralizerPhotographs showing the appearance of sapphire glass a before corrosion resistance test b after corrosion resistance test using NH4F mineralizer (b) after corrosion resistance test using NH4Cl mineralizer: corrosion resistance test conditions were 450 °C, 102 MPa, 2.0 ± 0.1 mol% mineralizer concentrationBack to article page