Magnetic properties of high-density Mn-Zn ferrites

Abstract

Subdomain size superparamagnetic particles of Mn-Zn ferrites, having a narrow particle size distribution (peaked around 10 nm) were prepared under mild hydrothermal conditions. High densities (≳99.5%) have been obtained upon sintering these green ferrite powders at relatively low temperatures (∼1000 °C), without the use of any sintering aids. Permeability spectra and other magnetic and electrical properties of the sintered ferrites were studied.

Microwave-flash combustion synthesis of Ni0.8Zn0.2Fe2O4 and its dielectric characterization

“…Porosity of the order of 7 -22% is obtained for Ni -Zn ferrite of composition Ni 0.8 Zn 0.2 Fe 2 O 4 sintered at various temperatures. It has been reported that the typical porosity range for ferrites is 7 -25 % [19]. The sintered density obtained is higher than that of Ni-Zn ferrites prepared by flash combustion technique in normal heating, which is reported earlier [20].…”

Sonochemical Preparation of Nanosized Amorphous NiFe2O4 Particles

“…The conventional high-temperature ceramic method for the preparation of ferrites can result in the loss of their fine particle nature. The wet chemical methods include coprecipitation, − spray drying, and hydrothermal processes . The fine ferrite particles are also produced by grinding coarse powders of high-purity bulk material in the presence of kerosene and oleic acid (organic surfactant) .…”

“…The wet chemical methods include coprecipitation, [5][6][7] spray drying, 8 and hydrothermal processes. 9 The fine ferrite particles are also produced by grinding coarse powders of high-purity bulk material in the presence of kerosene and oleic acid (organic surfactant). 10 However, in this method, the oleic acid is strongly bonded to the surface, making it difficult to remove by chemical means.…”

Microstructural and magnetic properties of Zn substituted nickel ferrite synthesised by facile solution combustion method

“…Potential applications of these materials depend upon the chemical composition and the route followed for their preparation. Different techniques such as the hydrothermal method [13], wet chemical method [14][15][16][17][18], solution combustion method [19][20][21] and spray drying [22] have been employed by various researchers, which lead to the formation of nanoscale Ni-Zn ferrite particles. Currently, researchers have accomplished an adequate understanding of the doped Ni-Zn ferrites [23][24][25] using different methods.…”