Co-precipitation synthesis and two-step sintering of YAG powders for transparent ceramics |
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Authors: | Xianxue Li Bingyun Zheng Tareque Odoom-Wubah Jiale Huang |
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Affiliation: | 1. Department of Environment & Life Sciences, Putian University, Putian, Fujian 351100, PR China;2. Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and National Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Xiamen University, Xiamen 361005, PR China;3. Key Lab for Chemical Biology of Fujian Province, Xiamen University, Xiamen 361005, PR China |
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Abstract: | Yttrium aluminum garnet (Y3Al5O12, YAG) precursor was synthesized by the co-precipitation method with ammonium hydrogen carbonate as the precipitant. The influence of aging and calcination temperature on the precursor composition and transformation temperature of the YAG phase was investigated. On that basis, a two-step sintering (TSS) method (heating the sample up to 1800 °C followed by holding it at 1600 °C for 8 h) was used to fabricate bulk transparent YAG ceramics in vacuum (10−3 Pa) in this communication. A variety of techniques, such as X-ray powder diffraction, infrared spectra, scanning electron microscopy and UV–vis–NIR spectrophotometry were adopted to characterize the resulting YAG powders and ceramics. The results showed that aging had a dramatic effect on the precursor composition, which in turn influenced the transformation temperature of the YAG phase. Loosely agglomerated YAG powders with a mean particle size of 50 nm were obtained by calcinating the precursor without aging at 1000 °C. Finally, a transparent YAG ceramic specimen, achieving the in-line transmittance of 41% in the visible wavelength region and a nearly pore-free microstructure with uniform grains of about 4 μm, was produced via the TSS technique. |
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Keywords: | ASintering YAG Co-precipitation |
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