Combustion synthesis of a nanoceramic and its transparent properties

摘要

La _(0.1)Nd _(0.1)Y _(1.8)O _3 transparent ceramics nanopowders were prepared using the combustion synthesis. To achieve such transparent ceramics, Y _2O _3 were used as matrix materials and La ~3 and Nd ~3 were used as dopants, polyethyleneglycol (PEG) as dispersants for the sintering under vacuum 10 ~(-3) Pa and 1600°C for 6 h. The precursor and powders calcined at different temperatures were characterized using TG-DTA, XRD, BET and FESEM. The transmittance of the transparent ceramics was measured using the sub-photometer. Results showed that La ~3 and Nd ~3 were completely dissolved into the cubic lattice of Y _2O _3. The sizes of Y _(1.8)La _(0.1)Nd _(0.1)O _3 powders were uniform and spherical-like. The particle sizes of powders gradually increased with increasing the calcination temperature. The dispersant can effectively prevent the powders from the agglomeration, and the particle sizes of powders gradually increased with increasing citric acid. The transmittance of the Y _(1.8)La _(0.1)Nd _(0.1)O _3 transparent ceramics was close to its theoretical value (80%).