Comparative study of ZnSe powders synthesized by two different methods and sintered by Hot-Pressing
Résumé
ZnSe powders have been synthesized using two different methods: hydrothermal and high energy ball milling. The obtained powders have been dispersed and sepd. through the ultrasonic process. A comparison has been made between the powders by means of X-Ray powder Diffraction (XRD) and SEM (SEM). The as-prepd. ZnSe powders and the fine powders obtained after ultrasonic sepn. have been sintered by conventional uniaxial Hot-Pressing (HP) technique in order to prep. ZnSe bulk ceramics. The optical properties of the ceramics have been characterized and compared. As a result, the sintering of the fine hydrothermal powder presents the best transparency in the visible and IR range. The transmission exceeds 60% in the range from 11 to 19 μm.