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

• Published in: Ceramics international 2006, Vol.32 (6), p.647-652
• Main Authors: JEONG HO RYU, KOO, Sang-Mo, DONG SUK CHANG, YOON, Jong-Won, CHANG SUNG LIM, KWANG BO SHIM
• Format: Article
• Language: English
• Subjects: Chemistry; Colloidal state and disperse state; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; General and physical chemistry; Materials science; Nanocrystals and nanoparticles; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Powders
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2005.04.025

Nanocrystalline lead tungstate (PbWO4) powders, with scheelite-type structure, were synthesised 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 3 h. Crystallisation 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 28 nm at temperatures between 400 and 600 C, showing a tendency to increase with temperature. The PbWO4 powders prepared at 600 C showed the strongest photoluminescent intensity, which was ascribed to the higher crystallinity and homogeneous particle morphology. 33 refs.