The effect of Cu content on the structure of Ni1−xCuxFe2O4 spinels |
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Authors: | Xiaoyan Tan Guiying Li Changwei Hu |
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Affiliation: | a Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, PR China b The Institute of Applied Chemistry, Central South University of Forestry & Technology, Changsha, Hunan 412006, PR China |
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Abstract: | A series of Ni1−xCuxFe2O4 (0 ≤ x ≤ 0.5) spinels were synthesized employing sol-gel combustion method at 400 °C. The decomposition process was monitored by thermal analysis, and the synthesized nanocrystallites were characterized by X-ray diffraction, transmission electron microscopy, infra-red and X-ray photoelectron spectroscopy. The decomposition process and ferritization occur simultaneously over the temperature range from 280 °C to 350 °C. TEM indicates the increase of lattice parameter and particle size with the increase of copper content in accordance with the XRD analysis. Cu2+ can enter the cubic spinel phase and occupy preferentially the B-sites within x = 0.3, and redundant copper forms CuO phase separately. A broadening of the O 1s region increases with the increment of copper content compared to pure NiFe2O4, showing different surface oxygen species from the spinel and CuO. Cu2+ substitution favors the occupancy of A-sites by Fe3+. |
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Keywords: | B Sol-gel chemistry C Photoelectron spectroscopy C Thermogravimetric analysis (TGA) C X-ray diffraction D Surface properties |
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