Novel nanosized lead tungstate (PbWO4) hollow spindles were successfully synthesized, for the first time, via a Pluronic P123- (EO20PO70EO20-) assisted sonochemical process. The triblock copolymer acted as a structure-directing agent and played a key role in the formation of the hollow spindles. An in situ micelle templating mechanism has been proposed for the possible formation mechanism of th...

Lead tungstate (PbWO4) and cadmium tungstate (CdWO4) are dense, fast scintillator crystals which have achieved technological importance for high energy radiation detectors and medical imaging, respectively. Calcium tungstate (CaWO4, the mineral scheelite) is an important phosphor for lighting and displays. We recently compared the electronic structures of the four scheelite-structure materials ...

This report presents result of a study on radiation induced color center densities in a La doped lead tungstate (PbWO4) crystal. The creation and annihilation constants of radiation induced color centers were determined by using transmittance data measured for a PbWO4 sample before and during 60Co -ray irradiation at a dose rate of 15 rad/hr. Following a model of color center kinetics, these co...

Lead tungstate (PbWO4) crystallizes in the scheelite (CaWO4) structure, is transparent (Eg ≈ 4.2 eV), and has a broad intrinsic luminescence band at 420 nm. The high atomic numbers, high density, short electron and γ-ray stopping range, radiation hardness, and short lifetime of its intrinsic luminescence at room temperature (~10ns), have resulted in the selection of PbWO4 as the scintillator fo...

Monoclinic raspite PbWO4 nanobelts were synthesized by a facile composite-salt-mediated method. By in situ heating to above 538 C inside the chamber of a transmission electron microscope, the raspite nanobelts transformed irreversibly to tetragonal scheelite phase. By analyzing the experimental data, three possible topotactic transformation relationships between raspite and scheelite phases hav...

The light output, α/β ratio, and pulse shape have been investigated at −25◦ C with PbWO4 crystal scintillators undoped, and doped by F, Eu, Mo, Gd and S. The fast 0.01 − 0.06 μs and middle 0.1 − 0.5 μs components of scintillation decay were observed for all the samples. Slow components of scintillation signal with the decay times 1− 3 μs and 13− 28 μs with the total intensity up to ≈ 50% have b...