Oxide ion conduction in Nd9.33(SiO4)6O2 and Sr2Nd8(SiO4)6O2 single crystals grown by floating zone method |
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| Institution: | 1. Division of Material Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;2. Niihama National College of Technology, Niihama 792-8580, Japan;1. Nigde University, Faculty of Arts and Sciences, Physics Department, Nigde, Turkey;2. Celal Bayar University, Faculty of Arts and Sciences, Department of Physics, Manisa, Turkey;3. Babes-Bolyai University, Raluca Ripan Institute for Research in Chemistry, Fantanele 30, 400294 Cluj-Napoca, Romania;4. Babes-Bolyai University, Electronic Microscopy Centre, Clinicilor 37, 400006 Cluj Napoca, Romania;5. Museo Nacional Ciencias Naturales, Jose Gutierrez Abascal 2, Madrid 28006, Spain;6. Ege University, Institute of Nuclear Sciences, 35100 Izmir, Turkey;7. Physics Department, Jazan University, P.O. Box 114, Jazan, Saudi Arabia;1. Grupo de criação em experimentos de Ciências (G-CEC), 49031-240 Aracaju, SE, Brazil;2. Departamento de Química, Faculdade Pio Décimo, 49095-000 Aracaju, SE, Brazil;3. Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristóvão, SE, Brazil;4. Departamento de Física, Universidade Federal de Sergipe, 49500-000 Itabaiana, SE, Brazil;1. Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0196, Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;3. Tokuyama Corp., 1-1 Mikage-cho, Shunan-shi, Yamaguchi 745-8648 Japan;1. Institute for Single Crystals, NAS of Ukraine, Lenin Ave. 60, 61001 Kharkov, Ukraine;2. Institute of Physics, PAS, Al. Lotników 32/46, 02-668 Warsaw, Poland;3. Center for Optical Materials and Technologies, Belarusian National Technical University, Nezavisimosti Ave. 65, 220013 Minsk, Belarus;4. Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland;5. National Centre for Nuclear Research, Andrzeja So?tana 7, 05-400 Otwock-?wierk, Poland;6. HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany;1. Research Center for Rare Earths & Micro/Nano Functional Materials, Nanchang University, Nanchang 330031, China;2. Department of Prosthodontics, Stomatological Hospital Affiliated to Nanchang University, Nanchang 330006, China;3. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China |
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| Abstract: | Single crystals of Nd9.33(SiO4)6O2 and Sr2Nd8(SiO4)6O2 oxide ion conductors with the oxyapatite structure were grown without any macroscopic defect by the floating zone method. The oxide ion conductivity of the Sr2Nd8(SiO4)6O2 single crystal varied with the distance from its seed crystal along the growth direction, because of its changing deficiency in Sr content. Its stoichiometric portion had a lower electrical conductivity by about five orders of magnitude at 600 °C than the value for Nd9.33(SiO4)6O2 single crystal. Structural refinement of neutron diffraction data for powdered Nd9.33(SiO4)6O2 single crystal showed that the previous structure analysis was misleading. Cation vacancies were present only at 4f site and its channel oxygen site was fully occupied in space group of P63/m. The oxygen had an anisotropic displacement along the channel in the refined oxyapatite structure. |
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