Effect of crystallization temperature on surface reflectance characeristics of red mud glass-ceramic

Red mud glass-ceramic were prepared in this paper to analyze the effect of different crystallization temperatures (850 °C–940 °C) on crystallization characeristics, microscopic structure and surface reflectances of red mud glass-ceramic samples. The results show that, as the crystallization temperature rises up, the diffraction peak strength of crystalline phase is enhanced in common augite and diopside and the degree of crystallization is improved gradually. The crystalline grains are grown gradually and distributed evenly. The surface reflectances of red mud glass-ceramic samples under ultraviolet-visible-near infrared band are enhanced as the crystallization temperature rises. The surface reflectance is higher in visible light band and the reflection peak is found at 558 nm, the highest surface reflectance of 14.5% is found at crystallization temperature of 940 °C. The reflectances are found lower in near infrared band. The surface reflectances of red mud glass-ceramic samples under middle infrared band are increased gradually as the crystallization temperature rises, with a sharp reflection peak at 985 cm⁻¹, and the highest reflectance of 13.8%. (paper)