Effect of MgO on the microstructure of Polycrystalline Nd:YAG Ceramics and its action mechanism

摘要

1.0at% Nd:YAG polycrystalline ceramics were fabricated with different sintering adds by solid-state reaction and vacuum sintering method. The optical transmittance spectra of the samples were measured using V-570 UV spectrophotometer. The microstructure and the grain size of the samples were characterized by Scanning electron microscope. It is found that the sample with 0.5wt% SiO_2 and 0.5wt% MgO had the best transmittance, the most densification and uniform grain size, and the grain size decreased with the increasing MgO. Effects of MgO on the microstructure of YAG and its action mechanism have been investigated.