Low‐Temperature Synthesis of NiFe₂O₄by a Hydrothermal Method

Abstract

Nickel ferrite (NiFe 2 O 4 ) nanoparticles were successfully synthesized via a hydrothermal process and characterized by X-ray diffraction and transmission electron microscope techniques. The effects of reaction temperature, holding time, and RH ratio (isopropyl alcohol/water) were discussed. The NiFe 2 O 4 nanoparticles could be obtained at 601C within 3 h. The crystallization of the spinel ferrites was promoted by the increase in reaction temperature, holding time, and RH ratio.B. Ghate-contributing editor

Synthesis and study of magnetic properties of NiFe2O4 nanoparticles by PVA assisted auto-combustion method

“…Various methods have been established to prepare NiFe 2 O 4 nanoparticles, such as sol-gel method, reverse micelle, polymer assisted co-precipitation method, shock wave synthesis, combustion reaction, sonochemical process, hydrothermal methods, polymer-pyrolysis method, citrate precursor techniques and reverse micro emulsion process [7][8][9][10][11][12][13][14][15][16][17][18].…”

Nickel/Iron Oxide Nanocrystals with a Nonequilibrium Phase: Controlling Size, Shape, and Composition

“…In previously reported syntheses of mixed nickel−iron oxide nanoparticles, the two commonly reported phases are spinel nickel ferrite (NiFe 2 O 4 ) 41,42 and rocksalt bunsenite (NiO) with iron in solid solution. 43−47 Although the equilibrium phase diagram of the Ni−Fe−O system predicts negligible solubility of Fe in the rocksalt NiO phase below 800°C…”

One-pot synthesis of PVP-coated Ni0.6Fe2.4O4 nanocrystals

“…The special physical properties of low magnetic coercivity and high electrical resistivity make nickel ferrite an excellent core material for power transformers in electronic and telecommunication applications [15]. Different synthetic methods such as mechanosynthesis [16], hydrothermal synthesis [17], coprecipitation [18], combustion synthesis [19], sol-gel methods [20], microwave processing [21], and thermal decomposition [10,22], have been used so far to produce nickel ferrite nanocrystals. *Corresponding author (email: gaomy@iccas.ac.cn) Among these methods, thermal decomposition of organic metal precursors in high boiling point solvents has been demonstrated as a reliable route for preparing ferrite nanocrystals with uniform size, a high degree of crystallinity, and a clearly defined phase structure [10,23,24].…”