Hydrothermal synthesis of nickel ferrite powders,their properties and sintering |
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| Affiliation: | 1. Nanostructure Lab, Department of Physics, University of Guilan, Rasht, Iran;2. Department of Physics, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;1. Institute of Silicate Materials, Riga Technical University, Azenes 14/24, Riga LV-1048, Latvia;2. Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia;3. Estonian Nanotechnology Competence Center, Riia 142, 51014 Tartu, Estonia;1. XRD Lab, Physics Department, Faculty of Science, Ain-Shams University, Cairo, Egypt;2. Reactor Physics Department, NRC, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt;1. Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, M.S., India;2. Department of Basic Science and Humanities, Marathwada Institute of Technology (MIT), Aurangabad, M.S., India;3. Department of Physics, Yogeshwari College Ambajogai, Beed, M.S., India;1. Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;2. Department of Materials Engineering, Islamic Azad University, Najafabad Branch, Isfahan, Iran;3. Physics Department, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;4. Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran |
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| Abstract: | NiFe2O4 powders were synthesized by co-precipitation with ammonia solution using aqueous solution of NiCl2 and FeCl3 followed by hydrothermal treatment of the precipitate. It was found that crystallization in water led to nanometric in size and isometric in shape crystallites, whereas crystallization in sodium hydroxide solution results in particles of well defined walls. Generally, particles crystallized in water were smaller and their particle size distribution was narrower than those crystallized in NaOH solution. Behaviour of the powders under dry compaction and sintering strongly depended on the powder morphology. The powder crystallized in NaOH solution gave compacts of higher density and sintered density of this powder was also higher than that of the powder processed in water. |
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