scholarly journals Isochronal recovery behaviour on electromagnetic properties of polycrystalline nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) prepared via mechanical alloying

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nor Hapishah Abdullah ◽  
Muhammad Syazwan Mustaffa ◽  
Mohd Nizar Hamidon ◽  
Farah Nabilah Shafie ◽  
Ismayadi Ismail ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Property Values ◽  
Electromagnetic Properties ◽  
Complex Permeability ◽  
Polycrystalline Nickel ◽  
New Approach ◽  
Nickel Zinc ◽  
Electrical And Magnetic Properties ◽  
Measured Property ◽  
Hysteresis Behaviour

AbstractA new approach through heat treatment has been attempted by establishing defects by the process of quenching towards electrical and magnetic properties in the nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) sample. The measured property values in permeability and hysteresis characteristic gave their recovery behaviour in which the values, after quenching were recovered after undergoing the annealing. Interestingly, a different trend observed in the permittivity value whereas the value was increased after quenching and subsequently recovered after annealing. The mechanisms which produced the changes is believed to be involved by defects in the form of vacancies, interstitials, microcracks and dislocations created during quenching which gave rise to changes in the values of the complex permeability and permittivity components and hysteresis behaviour.

scholarly journals Study of barium titanate/nickel-zinc ferrite based composites: Electrical and magnetic properties and humidity sensitivity

2020 ◽  
Vol 14 (1) ◽  
pp. 9-18
Author(s):  
Mirjana Vijatovic-Petrovic ◽  
Adis Dzunuzovic ◽  
Jelena Bobic ◽  
Nikola Ilic ◽  
Ivan Stijepovic ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Zinc Ferrite ◽  
Hysteresis Loops ◽  
Weight Fraction ◽  
Impedance Analysis ◽  
Ferroelectric Material ◽  
Ferrite Phase ◽  
Total Conductivity ◽  
Nickel Zinc ◽  
Electrical And Magnetic Properties

Composites based on barium titanate and nickel zinc ferrite doped with cooper and samarium were prepared by a mixing method. The formation of barium titanate tetragonal crystal structure and nickel zinc ferrite cubic spinel structure was identified. Polygonal grains were formed in all three types of ceramics. Due to the very high conductivity of ferrite phase in the materials the ferroelectric hysteresis loops were roundish and not typical for classical ferroelectric material. The break down field was found to be similar for all compositions. Leakage current measurements have shown the existence of different types of conductivity mechanisms in each material. The impedance analysis suggested a bit stronger impact of grain boundaries on total conductivity of the composites and the mechanism of polaronic conduction of two types. The magnetization of the composites is lower than for the pure ferrite phase and corresponds to the weight fraction of the ferrite phase. The soft magnetic nature of these composites might be very useful for development of multifunctional devices which will be able to switch the magnetization with small external magnetic field. Humidity sensing properties of the prepared ceramics were also investigated.

Wear of non-stoichiometric polycrystalline nickel-zinc ferrite

1977 ◽  
Vol 13 (5) ◽  
pp. 1478-1479 ◽  
Author(s):  
W. Kehr ◽  
R. Thornley ◽  
C. Meldrum
Keyword(s):  
Zinc Ferrite ◽  
Polycrystalline Nickel ◽  
Nickel Zinc

The Preparation and Electromagnetic Properties of Nickel-Zinc Ferrite Thin Films

2011 ◽  
Vol 287-290 ◽  
pp. 2294-2297
Author(s):  
Yan Wang ◽  
Ying Huang ◽  
Qiu Fen Wang
Keyword(s):  
Thin Films ◽  
Polyvinyl Alcohol ◽  
Zinc Ferrite ◽  
Sol Gel ◽  
Dip Coating ◽  
Electromagnetic Properties ◽  
Complexing Agent ◽  
Nanocrystalline Nickel ◽  
Nickel Zinc ◽  
Ferrite Thin Films

Compared polyvinyl alcohol with citric acid as complexing agent, nanocrystalline nickel-zinc ferrite thin films were prepared by sol-gel method and dip-coating process under different temperature. The phase composition, morphology, magnetic properties and electromagnetic properties of nanocrystalline nickel-zinc ferrite thin films were studied by X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), vibrating sample magnetometer (VSM) and vector network analyzer. The results show polyvinyl alcohol is the proper complexing agent for the preparation of nanocrystalline nickel-zinc ferrite thin films, which is stacked with sheet crystals and average diameter of about 20nm. The maximum saturation magnetization, the remanence magnetization and the coercivity of prepared nickel-zinc ferrite thin films are 39.38 emu/g, 11.47emu/g and 182.82 Oe, respectively. Through studying the microwave-absorbing properties of thin films, the maximal absorption quantity is determined at 9.2 GHz.

scholarly journals Microstructure and Electromagnetic Properties of Ni-Zn-Co Ferrite up to 20 GHz

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Charalampos Stergiou
Keyword(s):  
Wall Motion ◽  
Wave Attenuation ◽  
Domain Wall Motion ◽  
Electromagnetic Properties ◽  
Complex Permeability ◽  
Microwave Dielectric ◽  
Zn Ferrite ◽  
Spin Resonance ◽  
Production Stages

The present paper examines the relation between different developed microstructures and the microwave electromagnetic properties in Ni-Zn-Co ferrite. To this end, the Ni0.25Zn0.25Co0.5Fe2O4composition has been prepared with the conventional ceramic process with varied prefiringTP(750°C, 1000°C) and sinteringTStop temperatures (1200°C, 1250°C). When lower temperatures are applied in these production stages, incomplete microstructures with low density, higher porosity, or finer grains are achieved. On account of these features, the contributions of domain wall motion and spin rotation to the complex permeabilityμ⁎(f)move to higher frequencies, whereas microwave dielectric permittivityε⁎(f)is decreased. In particular in conjunction with the high Co content, the wall relaxation and spin resonance are interestingly forced to occur at 850 MHz and 8.05 GHz, respectively. Regarding the electromagnetic wave attenuation, the ferrite annealed at lower temperatures exhibits strong return loss peaks at higher frequencies, but without other performance improvement. We should notice that the variations in sintering temperatureTSyield the maximum changes in the recorded parameters, including the coercive field,μ⁎(f),andε⁎(f), indicating the inferior role of prefiringTPin Ni-Zn ferrite.

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