研究目的
Investigating the effect of calcium oxide (CaO) doping on the microstructure and optical properties of YAG transparent ceramics.
研究成果
The study concluded that CaO as a sintering aid can effectively inhibit grain growth at a low doping level due to the solute drag effect. A fully dense and pore-free YAG ceramic with an in-line transmittance of 80.8% at 1100 nm was achieved with 0.1 at% CaO. However, excess CaO leads to the formation of grain boundary phases and residual pores, deteriorating the optical quality. The presence of a liquid phase was observed for the first time in high CaO-doped YAG ceramics, confirming its sintering mechanism.
研究不足
The study is limited by the technical constraints of the vacuum sintering process and the potential for optimization in the amount of CaO additives to achieve higher optical quality in YAG ceramics.
1：Experimental Design and Method Selection:
YAG transparent ceramics were fabricated by vacuum sintering using co-precipitated powders as raw materials with CaO as the sintering aid. The influence of CaO content on various properties was investigated.
2：Sample Selection and Data Sources:
YAG powders doped with different concentrations of CaO were synthesized by a co-precipitation method. The phase composition, particle size, and morphology of the powders, as well as the microstructural and optical properties of the ceramics, were analyzed.
3：List of Experimental Equipment and Materials:
Starting materials included yttrium oxide (Y2O3), nitric acid (HNO3), ammonium aluminium sulphate dodecahydrate (NH4Al(SO4)2·12H2O), and calcium nitrate tetrahydrate (Ca(NO3)2·4H2O). Equipment used included a Rigaku D/max-rA X-ray powder diffractometer (XRD), FEI Inspect F50 scanning electron microscope (SEM), and Lambda 750 UV-VIS-NIR spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The powders were synthesized, calcined, pressed into pellets, and sintered under vacuum. The sintered samples were then annealed and analyzed for their properties.
5：Data Analysis Methods:
The phase composition was characterized by XRD, morphology by SEM, and optical transmission spectra by UV-VIS-NIR spectrophotometry. The average grain size was calculated using the Scherrer equation and the linear intercept method.
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