Preparation of YAG powder by co-precipitation method in a narrow pH-change environment |
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| Authors: | Benyuan Ma Tiecheng Lu Shuxing Xiao Nian Wei Jianqi Qi Zhongwen Lu Wei Zhang Feng Li Xuezhen Xu |
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| Affiliation: | (1) Center for Thermal Spray Research, Department of Materials Science and Engineering, State University of New York, Stony Brook, NY, USA;(2) Present address: GT Solar Inc., 243 Daniel Webster Highway, Merrimack, NH 03054, USA;(3) Metallurgical and Materials Engineering, Indian Institute of Technology–Madras, Chennai, 600 036, India;(4) Present address: Boston Applied Technologies, Inc., Woburn, MA 01801, USA;(5) Present address: GE Energy, Schenectady, NY, USA |
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| Abstract: | YAG (Y3Al5O12) powder was prepared by co-precipitation method. To avoid pH values changing intensely during titration process, the NH4HCO3 solution with NH4NO3 was used as precipitant solution. The pH change of precipitant solution during titration process, compositions of precursor, phase formation process and morphology of the prepared powder were investigated by means of pH meter, FT-IR, XRD and TEM. The results show that the presence of NH4NO3 in NH4HCO3 solution is crucial to alleviate the pH change, lower the calcination temperature and meliorate the morphology of YAG powder. The mechanisms were studied in detail. The YAG phase can be obtained at a lower temperature of 900 °C. The obtained powder, composed of elliptical particles, showed a meliorated morphology. |
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