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Neutron diffraction and IR spectroscopy on mechanically alloyed La-substituted PbWO4 |
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| Authors: | Shigeomi Takai Tomohoro Nakanishi Kenichi Oikawa Shuki Torii Akinori Hoshikawa Takashi Kamiyama Takao Esaka |
| Institution: | a Department of Materials Science, Faculty of Engineering, Tottori University, Minami 4-101, Koyamacho, Tottori 680-0945, Japan b Center for Proton Accelerator Facility, JAERI, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan c Neutron Science Research Center, JAERI, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan d Neutron Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan |
| Abstract: | Defect structures of the lanthanum-substituted PbWO4 prepared by mechanical alloying (MA) were investigated by means of powder neutron diffraction and FT-IR, to compare with that of the oxide ion conductive sintered samples. Neutron diffraction revealed that Pb1?xLaxWO4+x/2 prepared by MA possessed the lead site deficiency in the lattice. In addition, it was also found that occupation factors of the lead site were still smaller than the nominal value even for the mechanically alloyed Pb1?xLa2x/3WO4. The vacancy formation at the lead site of the mechanically alloyed Pb1?xLaxWO4+x/2 was also corroborated from the splitting of the absorption band around 800 cm?1 ascribed to the W–O stretching vibration of WO4 tetrahedron. At the end of this paper, the formation process of the lead site vacancy was discussed in the sintered Pb1?xLaxWO4+x/2 during milling. |
| Keywords: | PbWO4 Mechanical alloying FT-IR Neutron diffraction Defect structure Oxide ion conductor |
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