Microwave-assisted synthesis of barium molybdate by a citrate complex method and oriented aggregation

BaMoO 4 powders, which have scheelite type structure, were successfully synthesized at low temperatures by a modified citrate complex method assisted by microwave irradiation. The citrate complex precursors were heat-treated at temperatures from 300 to 500 °C for 3 h. Crystallization of the BaMoO 4...

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Bibliographic Details
Published in:	Materials research bulletin Vol. 40; no. 9; pp. 1468 - 1476
Main Authors:	Ryu, Jeong Ho, Yoon, Jong-Won, Lim, Chang Sung, Shim, Kwang Bo
Format:	Journal Article
Language:	English
Published:	United States Elsevier Ltd 01-09-2005
Subjects:	A. Ceramics AGGLOMERATION ANISOTROPY B. Chemical synthesis BARIUM C. Electron microscopy CERAMICS CHEMICAL PREPARATION CITRATES COMPLEXES CRYSTAL GROWTH CRYSTALLIZATION D. Luminescence ELECTRON MICROSCOPY HEAT TREATMENTS IRRADIATION MATERIALS SCIENCE MICROWAVE RADIATION MOLYBDATES MORPHOLOGY PHOTOLUMINESCENCE B. Chemical synthesis A. Ceramics C. Electron microscopy D. Luminescence
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Summary:	BaMoO 4 powders, which have scheelite type structure, were successfully synthesized at low temperatures by a modified citrate complex method assisted by microwave irradiation. The citrate complex precursors were heat-treated at temperatures from 300 to 500 °C for 3 h. Crystallization of the BaMoO 4 powders were detected at 350 °C, and completed at a temperature of 400 °C. TEM image of the BaMoO 4 product obtained above 400 °C revealed spindle-rods-like or flake-like morphology. The anisotropic growth habit of BaMoO 4 leads to the oriented aggregation, which is attributed to the high chemical potentials of the intrinsic structure of BaMoO 4. The BaMoO 4 powder prepared at 500 °C showed the strongest photoluminescent intensity.
ISSN:	0025-5408 1873-4227
DOI:	10.1016/j.materresbull.2005.04.032