Magnetic properties of nanocrystalline ?-Fe3N and Co4N phases synthesized by newer precursor route |
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| Affiliation: | 1. Department of Chemistry, Birla Institute of Technology and Science, Pilani, K.K. Birla, Goa Campus, Zuari Nagar, Goa 403726, India;2. Defence Metallurgical Research Laboratory, Hyderabad 500058, India;1. School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, PR China;2. College of Chemistry and Material Engineering, Chao Hu University, Hefei 238000, China;3. Department of Applied Chemistry, School of Science, Xi''an Jiaotong University, Xi''an 710049, PR China;4. School of Environmental and Architecture, University of Shanghai for Science and Technology, Shanghai 200090, China;1. State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;2. Department of Energy Engineering, Department of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea;3. Department of Chemistry, City University of Hong Kong, Hong Kong 999077, China;4. College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China;5. Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang 37673, South Korea;1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, PR China;2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China;1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, PR China;2. School of Printing and Packaging, Wuhan University, Wuhan, Hubei 430072, PR China;3. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China;4. Suzhou Institute of Wuhan University, Suzhou, Jiangsu 215123, PR China;1. School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, People’s Republic of China;2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China |
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| Abstract: | Nanocrystalline ?-Fe3N and Co4N nitride phases are synthesized first time by using tris(1,2-diaminoethane)iron(II) chloride and tris(1,2-diaminoethane)cobalt(III) chloride precursors, respectively. To prepare ?-Fe3N and Co4N nitride phases, the synthesized precursors were mixed with urea in 1:12 ratio and heat treated at various temperatures in the range of 450–900 °C under the ultrapure nitrogen gas atmosphere. The precursors are confirmed by FT-IR study. The ?-Fe3N phase crystallizes in hexagonal structure with unit cell parameters, a = 4.76 Å and c = 4.41 Å. The Co4N phase crystallizes in face centred cubic (fcc) structure with unit cell parameters, a = 3.55 Å. The estimated crystallite size for ?-Fe3N and Co4N phases are 29 nm and 22 nm, respectively. The scanning electron microscopy (SEM) studies confirm the nanocrystalline nature of the materials. The values of saturation magnetization for ?-Fe3N and Co4N phases are found to be 28.1 emu/g and 123.6 emu/g, respectively. The reduction of magnetic moments in ultrafine materials compared to bulk materials have been explained by spin pairing effect, lattice expansion, superparamagnetic behaviour and canted spin structures at the surface of the particles. |
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| Keywords: | A Nitrides A Magnetic materials B Chemical synthesis C X-ray diffraction D Crystal structure |
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