抄録
Scandia is a ceramic material having a unique combination of interesting thermal and optical properties but difficult to be grown as single crystals. So as an alternative, we fabricated in this work transparent scandia polycrystalline ceramics via sintering. The starting powders for ceramics fabrication were synthesized by ourselves via precipitation from scandium nitrate solution, using hexamethylenetetramine as the precipitant and ammonium sulfate as an engineering reagent for powder properties (precursor composition and particle morphology). Characterizations of the powders were achieved by chemical analysis, DTA/TG, XRD, BET, and FESEM. Densification behaviors of the resultant scandia powders were studied in air via dilatometry. Scandia ceramics showing an inline transmittance of ~76% in the visible wavelength region (corresponding to ~92% of sapphire single crystal) have been fabricated by vacuum sintering at a relatively low temperature of 1700 oC.
