A review on MnZn ferrites: Synthesis, characterization and applications.

Glycine combusted ZnFe2O4 gas sensor: Evaluation of structural, morphological and gas response properties

Manganese zinc ferrites are technically and scientifically a very important class of ferrite materials because they possess a very high magnetic permeability and low core losses. These materials have been broadly used in electronic applications such as transformers, choke coils, noise filters, and memory devices. Extensive research has taken place and still going in this field of science and technology. Applications of Mn-Zn ferrites in last 10 years are reviewed. General features, properties, and applications are discussed. Also, the various synthesis techniques used for the preparation of Mn-Zn ferrites are also considered such as normal ceramic technique, sol-gel method, hydrothermal method, co-precipitation method, and citrate precursor method. As the field is quite large, a reasonable effort has been made to include some of the original references discussing in details the specific outcome of the papers published.

Manganese Zinc Ferrites: a Short Review on Synthesis and Characterization

In this study, nanocrystalline Li–Zn ferrites with the chemical composition Li0.5Zn
 x
 Fe2.5−x
 O4 (where x=0, 0.1,0.2,0.3,0.4,0.5) were synthesized by the glycine–nitrate process using glycine as a fuel, nitrate as an oxidizer and microwave oven as a heat source. The combustion reaction was studied by differential thermal analysis and thermogravimetry. The experimentally determined combustion reaction is extremely exothermic and it occurs at 170 ∘C. The as-synthesized powders were characterized by X-ray diffraction technique. X-ray diffraction data shows that nanocrystalline Li–Zn ferrite powders with a spinel structure have been formed successfully in all samples. Morphological studies using scanning electron microscopy and field emission scanning electron microscopy show agglomerated clusters with a lot of pores attributed to the large amount of gases released during the combustion synthesis with the particle size of 20–40 nm. The magnetic measurements on the as-synthesized powders and compacted samples were carried out using a vibrating sample magnetometer and an inductance/capacitance/resistance meter, respectively. Saturation magnetization increases with the increase in zinc concentration up to x=0.2 and then it decreases with the increase in the zinc content. In addition, maximum magnetic permeability also obtained for the sample with x=0.2 at different frequencies.

Structural and Magnetic Properties of Nanocrystalline Lithium–Zinc Ferrite Synthesized by Microwave-Induced Glycine–Nitrate Process

Nanosized mixed ferrite Mn0.3Zn0.7Fe2O4 was prepared by a hydrothermal method at pH 11 and 180°C. XRD analysis showed that the material had the characteristic spinel structure with average particle size 14 nm. The real part of the AC susceptibility clearly proved the ferrite had spin glass like behavior. Magnetic inductive heating studies were performed at 236 kHz with magnetic field amplitude 50–80 Oe. The specific absorption (SA) was investigated by use of linear response theory. The experimental results were in good agreement with theoretical predictions. Moreover, the intrinsic loss power (ILP) was calculated from SA values. It is believed that Mn0.3Zn0.7Fe2O4 nanoparticles with a high ILP will be useful for in situ hyperthermia treatment of cancer.

Studies of the Magnetic Properties and Specific Absorption of Mn 0.3 Zn 0.7 Fe 2 O 4 Nanoparticles

Manganese-Zinc ferrites belong to the group of soft ferrite materials characterized by high magnetic permeability and low power loses These materials are mainly used as cores for inductors, transformers, recording heads and noise filters among others In this study, nanocrystalline Mn-Zn ferrite with the chemical formula Mn1-xZnxFe2O4 with x=02, 04, 06, 08 has been successfully synthesized by glycine-nitrate auto-combustion process using glycine as a fuel and nitrates as oxidants The structures and magnetic properties of the resulting powder were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) It is revealed from the XRD pattern than a significant amount nanocrystalline Mn1-xZnxFe2O4 ferrite with average crystallite size in the range 4325-667 nm has been formed The magnetic measurement gives a typical value of saturation magnetic of 34-69 emu/g and coercivity of 40-60 Oe

Maryam Pourmahdavi

Papers

Structure and Magnetic Properties of Mn-Zn Ferrite Synthesized by Glycine-Nitrate Auto-Combustion Process