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Start Over Author "Koo, Sang-Mo" Journal ceramics international
15 results on '"Koo, Sang-Mo"'

15. Microwave-assisted synthesis of PbWO4 nano-powders via a citrate complex precursor and its photoluminescence

Author

Ryu, Jeong Ho, Koo, Sang-Mo, Chang, Dong Suk, Yoon, Jong-Won, Lim, Chang Sung, and Shim, Kwang Bo

Subjects
*CRYSTALLIZATION, *TUNGSTATES, *IRRADIATION, *TEMPERATURE, *PHYSICAL & theoretical chemistry
Abstract

Abstract: Nanocrystalline lead tungstate (PbWO4) powders, which have scheelite-type structure, were successfully synthesized at low temperatures using a modified citrate complex method assisted by microwave irradiation. The citrate complex precursors were heat-treated at temperatures from 300 to 600°C for 3h. Crystallization of the PbWO4 precursor was detected at 400°C, and completed at 500°C. Nanocrystalline PbWO4 powders heat-treated between 400 and 600°C primarily showed spherical and disperse morphology. The average crystallite sizes of PbWO4 were between 17 and 28nm at temperatures between 400 and 600°C, showing a tendency to increase with the temperature. The PbWO4 powders prepared at 600°C showed the strongest photoluminescent intensity, which was ascribed to the higher crystallinity and homogeneous particle morphology. [Copyright &y& Elsevier]

Published
2006
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