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Nb 3d and O 1s core levels and chemical bonding in niobates
Institution:1. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;2. Technical Center, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;3. Laboratory of Crystal Chemistry, Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090, Russia;1. Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China;3. College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory of Transparent Opto-Functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 588 Heshuo Road, Shanghai 201899, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;2. Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;3. Department of Chemical Engineering, Universitas Islam Indonesia JI Kaliurang KM 14, 5 Sleman, Yogyakarta 55584, Indonesia;1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04 0 01 Kosice, Slovak Republic;2. Faciulty of Materials, Metallurgy and Recycling, Technical university of Ko?ice, Letná 9, 040 01 Kosice, Slovak Republic;3. Institute of Physics, Faculty of Science P.J. Safarik University, Park Angelinum 9, 041 54 Kosice, Slovak Republic;4. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava 45, Slovak Republic;5. Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F2, 842 48 Bratislava, Slovak Republic
Abstract:A set of available experimental data on binding energies of Nb 3d5/2 and O 1s core levels in niobates has been observed with using energy difference (O 1ssingle bondNb 3d5/2) as a robust parameter for compound characterization. An empirical relationship between (O 1ssingle bondNb 3d5/2) values measured with XPS for Nb5+-niobates and mean chemical bond length L(Nbsingle bondO) has been discussed. A range of (O 1ssingle bondNb 3d5/2) values possible in Nb5+-niobates has been defined. An energy gap ~1.4–1.8 eV is found between (O 1ssingle bondNb 3d5/2) values reasonable for Nb5+ and Nb4+ states in niobates.
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