Abstract
High sinterability nano-Y2O3 powders for transparent ceramics were successfully synthesized via the decomposition of hydroxyl-carbonate precursors from spray coprecipitation. The chemical composition of the precursor was determined as Y(CO3)(OH)·nH2O (n = 1–1.5), and it was evolved into Y2O3 particles with clear facets after calcination with the assistance of sulfate. Two dispersion mechanisms, “absorption” and “intercalation,” were proposed to work together to provide the dispersion effect. Microstructural and optical characterization of powders and as-fabricated transparent ceramics was employed to evaluate the sintering behavior of powders. The nanopowders calcined at 1250 °C had weakly agglomerated morphology with the mean particle size of ~140 nm and exhibited excellent sinterability. The in-line transmittance of Y2O3 ceramic of 1 mm thickness that was vacuum sintered at 1800 °C for 8 h without any sintering additives reached 78.7% at 1064 nm.
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Acknowledgements
The authors acknowledge the generous financial support from the National Natural Science Foundation of China (51402133, 51202111, 11274144), Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Guangdong Provincial Key Laboratory (2014B030301014), Research and Innovation Program for College Graduates of Jiangsu Province (KYZZ16_0231), and Special Project for Technology Innovation of Xuzhou City (KC16GZ014, KC16HQ236, KC16HQ237).
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Zhang, L., Li, Z., Zhen, F. et al. High sinterability nano-Y2O3 powders prepared via decomposition of hydroxyl-carbonate precursors for transparent ceramics. J Mater Sci 52, 8556–8567 (2017). https://doi.org/10.1007/s10853-017-1071-0
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DOI: https://doi.org/10.1007/s10853-017-1071-0