Doping Effect On Sinterability And Spectral Properties Of Yttria Based Transparent Ceramics

Transparent Y₂O₃ ceramic is kind of a new light functional material which has excellent properties.Not only does it has an excellent light transmittance performance which is similar to single crystal and glass,but also it has properties such as high-temperature resistance,high pressure resistance,corrosion resistance,high strength,high hardness,which is like ceramics.Because of these excellent characteristics,it has advantages in terms of lighting,optical and medical instruments,laser grain medium,armor,infrared detection,etc.,thus it gets wide attention.In this paper,the sintering aids and rare ions doping effect on yttria-based powders and transparent ceramics are systematic discussed.The synthesis of powders and transparent ceramics are also investigated by a co-precipitation processing and the solid state reaction method,and the methods as well as process are on comparison.The main points are as follows:?1?Er³⁺:Y₂O₃ powders and ceramics doped with various ZrO₂ and La₂O₃concentrations were calcinated at different temperatures by the solid state reaction processing,and the evolution of the phase composition,morphology and luminescence properties were studied.It is indicated that the incorporation of La³⁺and Zr⁴⁺into Y₂O₃ host lattice can effectively suppressed the grain-boundary migration,and improve density and transmittance of Er³⁺:Y₂O₃ transparent ceramics,and the luminescence can also be enhanced.?2?Fabrication of 1 mol%Ho³⁺with different sensitizing ions(Yb³⁺,Tm³⁺,Er³⁺)co-doped(Y_0.88La_0.09Zr_0.03)₂O₃ transparent ceramics was synthesized by the solid state reaction.Doping effect of different ions on the phase composition,morphology and luminescence properties of the ceramic was investigated.The results show that the doping of sensitizing ions can enhance the luminescence and improve the transmittance of transparent ceramics.?3?Er³⁺:Y₂O₃ and Tm³⁺:Y₂O₃ transparent ceramics with doping of 0.5 mol%different kinds of sintering aids?Sc₂O₃,Lu₂O₃,ZnO,TiO₂?and 3 mol%ZrO₂ led to a high transmittance.The doping effect of the different sintering aids on the luminescence was studied.The optical properties of the above yttria based transparent ceramics were reported at the first time.?4?The(Y_0.88La_0.09Zr_0.03)₂O₃ nanopowders with excellent properties were prepared by co-precipitation processing,and the high optical quality transparent ceramic was fabricated with the above nanopowders.The nanopowders were synthesized by co-precipitation process with NH₃·H₂O as precipitant,and the effects of?NH₄?₂SO₄ and PEG-400 as dispersants and calcination temperature were discussed.The result indicated that the nanopowders exhibited homogeneously spherical morphology and good dispersivity when calcinated at 1200?for 2 h,and the average particle size were 96 nm.Various concentrations of Er³⁺doped(Y_0.88La_0.09Zr_0.03)₂O₃ transparent ceramics were synthesized by the co-precipitation process,and the evolution of the phase composition,morphology and luminescences properties were studied.