Effects of sintering temperature on the microstructure, electrical and magnetic characteristics of copper-zinc spinel ferrite with possibility use as humidity sensors

2021 ◽  
Vol 332 ◽  
pp. 113060
Author(s):  
Iulian Petrila ◽  
Florin Tudorache
Keyword(s):  
Sintering Temperature ◽  
Spinel Ferrite ◽  
Magnetic Characteristics ◽  
Humidity Sensors ◽  
Copper Zinc

scholarly journals Nanostructured LiFe5O8 by a Biogenic Method for Applications from Electronics to Medicine

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 193
Author(s):  
Silvia Soreto Teixeira ◽  
Manuel P. F. Graça ◽  
José Lucas ◽  
Manuel Almeida Valente ◽  
Paula I. P. Soares ◽  
...  
Keyword(s):  
Spinel Ferrite ◽  
Sol Gel ◽  
Reaction Medium ◽  
Magnetic Hyperthermia ◽  
Magnetic Characteristics ◽  
Secondary Phases ◽  
Heat Treated ◽  
Structure Morphology ◽  
Sol Gel Process ◽  
Crystallite Sizes

The physical properties of the cubic and ferrimagnetic spinel ferrite LiFe5O8 has made it an attractive material for electronic and medical applications. In this work, LiFe5O8 nanosized crystallites were synthesized by a novel and eco-friendly sol-gel process, by using powder coconut water as a mediated reaction medium. The dried powders were heat-treated (HT) at temperatures between 400 and 1000 °C, and their structure, morphology, electrical and magnetic characteristics, cytotoxicity, and magnetic hyperthermia assays were performed. The heat treatment of the LiFe5O8 powder tunes the crystallite sizes between 50 nm and 200 nm. When increasing the temperature of the HT, secondary phases start to form. The dielectric analysis revealed, at 300 K and 10 kHz, an increase of ε′ (≈10 up to ≈14) with a tanδ almost constant (≈0.3) with the increase of the HT temperature. The cytotoxicity results reveal, for concentrations below 2.5 mg/mL, that all samples have a non-cytotoxicity property. The sample heat-treated at 1000 °C, which revealed hysteresis and magnetic saturation of 73 emu g−1 at 300 K, showed a heating profile adequate for magnetic hyperthermia applications, showing the potential for biomedical applications.

scholarly journals Effect of sintering temperature on structural, magnetic, dielectric and optical properties of Ni–Mn–Zn ferrites

2021 ◽  
Author(s):  
Nazia Khatun ◽  
Mohammad Sajjad Hossain ◽  
Most. Hosney Ara Begum ◽  
Suravi Islam ◽  
Nazmul Islam Tanvir ◽  
...  
Keyword(s):  
Sintering Temperature ◽  
Spinel Ferrite ◽  
Magnetic Hysteresis ◽  
Dielectric Behavior ◽  
Hysteresis Curve ◽  
X Ray Diffraction ◽  
Different Temperatures ◽  
Dielectric And Optical Properties ◽  
Wavenumber Region ◽  
Magnetic Dielectric

Spinel ferrite Ni[Formula: see text]Mn[Formula: see text]Zn[Formula: see text]Fe2O4 was prepared by a conventional ceramic process followed by sintering at three different temperatures (1050[Formula: see text]C, 1100[Formula: see text]C and 1150[Formula: see text]C). X-ray diffraction (XRD) investigations stated the single-phase cubic spinel structure and the FTIR spectra revealed two prominent bands within the wavenumber region from 600 cm[Formula: see text] to 400 cm[Formula: see text]. Surface morphology showed highly crystalline grain development with sizes ranging from 0.27 [Formula: see text]m to 0.88 [Formula: see text]m. The magnetic hysteresis curve at ambient temperature revealed a significant effect of sintering temperature on both coercivity ([Formula: see text] and saturation magnetization ([Formula: see text]. Temperature caused a decrease in DC electrical resistivity, while the electron transport increased, suggesting the semiconducting nature of all samples and that they well followed the Arrhenius law from which their activation energies were determined. The values of Curie temperature ([Formula: see text] and activation energy were influenced by the sintering temperature. Frequency-dependent dielectric behavior (100 Hz–1 MHz) was also analyzed, which may be interpreted by the Maxwell–Wagner-type polarization. The UV–vis–NIR reflectance curve was analyzed to calculate the bandgap of ferrites, which showed a decreasing trend with increasing sintering temperature.

Magnetic Spinel Ferrite: An Efficient, Reusable Nano Catalyst for HMFSynthesis

2021 ◽  
Vol 10 ◽  
Author(s):  
Jyoti Dhariwal ◽  
Ravina Yadav ◽  
Sheetal Yadav ◽  
Anshu Kumar Sinha ◽  
Chandra Mohan Srivastava ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Heterogeneous Catalysts ◽  
Spinel Ferrite ◽  
Active Surface ◽  
Catalytic Performance ◽  
Ferrite Nanoparticles ◽  
Precipitation Method ◽  
Magnetic Characteristics ◽  
Nano Catalyst

Aim: In the present work, the preparation and catalytic activity of spinel ferrite [MFe2O4; M = Fe, Mn, Co, Cu, Ni] nanoparticles to synthesize 5-hydroxymethylfurfural (HMF) have been discussed. Background: Ferrites possess unique physicochemical properties, including excellent magnetic characteristics, high specific surface area, active surface sites, high chemical stability, tunable shape and size, and easy functionalization. These properties make them essential heterogeneous catalysts in many organic reactions. Objective: This study aims to synthesize a series of transition metal ferrite nanoparticles and use them in the dehydration of carbohydrates for 5-hydroxymethylfurfural (HMF) synthesis. Method: The ferrite nanoparticles were prepared via the co-precipitation method, and PXRD confirmed their phase stability. The surface area and the crystallite size of the nanoparticles were calculated using BET and PXRD, respectively. Result: The easily prepared heterogeneous nanocatalyst showed a significant catalytic performance, and among all spinel ferrites, CuFe2O4 revealed maximum catalytic ability. Conclusion: Being a heterogeneous catalyst and magnetic in nature, ferrite nanoparticles were easily recovered by using an external magnet and reused up to several runs without substantial loss in catalytic activity. Others: HMF was synthesized from fructose in a good yield of 71%.

Structural Change and Magnetic Properties of Mechanically Alloyed Spinel Ferrite CoFe2O4

2020 ◽  
Vol 855 ◽  
pp. 108-116
Author(s):  
Novrita Idayanti ◽  
Dedi ◽  
Azwar Manaf
Keyword(s):  
Magnetic Properties ◽  
Sintering Temperature ◽  
Spinel Ferrite ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
A Value ◽  
Hall Plot ◽  
Crystallite Sizes ◽  
The Mean

Magnetic property studies and the crystallite structures evolution of spinel ferrite CoFe2O4 particles are reported in this paper. The ferrite was prepared through mechanical milling of all alloy precursors and sintered at various temperatures of 800, 900, 1000, and 1100 °C to promote the crystalline structure. X-ray diffraction (XRD) and Williamson-Hall plot were used to calculate the mean crystallite size and microstrain. Changes in the microstructure and crystallite sizes were occurring due to sintering treatments. It is found that the remanence (Mr) and saturation magnetization (Ms) increase with increasing sintering temperature, but a decrease occurred only at the temperature of 1100 °C. The optimum magnetic properties were obtained in a sample sintered at 1000 °C with a value of Mr = 36.00 emu/g and Ms= 74.05 emu/g.

Evaluation of electrical, dielectric and magnetic characteristics of Al–La doped nickel spinel ferrites

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6589-6597 ◽  
Author(s):  
Hafiz Sartaj Aziz ◽  
Saadia Rasheed ◽  
Rafaqat Ali Khan ◽  
Abdur Rahim ◽  
Jan Nisar ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Ferrite Nanoparticles ◽  
Spinel Ferrites ◽  
Magnetic Characteristics ◽  
Electrical And Magnetic Properties ◽  
Aluminum Ions ◽  
La Doped

The paper reports the effects of lanthanum and aluminum ions, on the structural, electrical and magnetic properties of NiFe2O4 spinel ferrite nanoparticles.

Studies on structural and magnetic properties of Ni-Mg-Co spinel ferrite nanoparticles sintered at different temperatures

2020 ◽  
Vol 34 (03) ◽  
pp. 2050041
Author(s):  
Xiqian Zhao ◽  
Aimin Sun ◽  
Wei Zhang ◽  
Lichao Yu ◽  
Zhuo Zuo ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Spinel Structure ◽  
Cobalt Ferrite ◽  
Sintering Temperature ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Peak Height ◽  
Magnetic Stability

In order to study the effect of sintering temperature on the structure and magnetic properties of nickel-magnesium-cobalt ferrite, [Formula: see text] spinel ferrite with different sintering temperatures (500[Formula: see text]C, 600[Formula: see text]C, 700[Formula: see text]C, 800[Formula: see text]C, 900[Formula: see text]C and 1000[Formula: see text]C) was prepared by sol–gel method. The magnetic properties of the prepared samples were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Vibrating sample magnetometer (VSM). The results show that the sintering temperature has a significant effect on the structure and magnetic properties of nickel-magnesium-cobalt ferrite. Analysis of the XRD pattern confirmed that all samples showed a single-phase cubic spinel structure. The particle size of the prepared sample determined by the Scherrer equation was 51 nm to 135 nm. As the sintering temperature increases from 500[Formula: see text]C to 1000[Formula: see text]C, the intensity of all peaks gradually increases, the crystallinity and particle size of the sample increase significantly, but the coercive force decreases, the saturation magnetization, the residual magnetization and the squareness [Formula: see text] increase first and then decrease. Compared with other samples, the 800[Formula: see text]C sintered samples had the highest saturation magnetization (59.03 emu/g), remanent magnetization (30.65 emu/g) and squareness (0.519). The increasing peak height of [Formula: see text] at [Formula: see text] indicates that the cubic spinel structure samples have good crystallinity and magnetic stability.

The Effect of Sintering Temperature on the Structural and Magnetic Properties of Ni-Mg Substituted CoFe2O4 Nanoparticles

2016 ◽  
Vol 846 ◽  
pp. 352-357 ◽  
Author(s):  
Rizuan Mohd Rosnan ◽  
Zulkafli Othaman ◽  
Ali A. Ati ◽  
Rosli Hussin ◽  
Shadab Dabagh ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Lattice Constant ◽  
Sintering Temperature ◽  
Spinel Ferrite ◽  
Precipitation Method ◽  
Average Crystalline Size ◽  
X Ray ◽  
Phase Spinel ◽  
Structural And Magnetic Properties ◽  
Co Precipitation

This study evaluates the structural and magnetic properties of Ni-Mg substituted Cobalt ferrite samples prepared through the co-precipitation method. The nominal compositions Co0.5Ni0.5−xMgx Fe2O4 in the range x = 0.1 have been synthesized and then was sintered at temperature at 700 and 1000°C in the furnace for 10 hour with a heating rate of 5°C/min. The prepared nanoferrites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and vibration sample magnetometer (VSM). XRD confirmed formation of single phase spinel ferrite with average crystalline size in the range of 27–33 nm. The lattice constant (a), cell volume (V) and X-ray density (ρx) are also calculated from XRD data. Lattice constant (a) decreases with an increase of sintering temperature. Further information about the structure and morphology of the nanoferrites was obtained from FESEM and results are in good agreement with XRD. Saturation magnetization showed increasing trend with sintering temperature from 700 to 1000°C.

Effect of Sintering Temperature on the Properties of Carbon Fiber Reinforced Copper-Zinc Alloy Composite

2015 ◽  
Vol 754-755 ◽  
pp. 181-186
Author(s):  
Saad Shahrizam ◽  
Che Pa Faizul ◽  
Mohd Zaki Ruhiyuddin ◽  
Darus Murizam ◽  
Jamil Noorina Hidayu
Keyword(s):  
Powder Metallurgy ◽  
Carbon Fiber ◽  
Copper Alloy ◽  
Volume Fraction ◽  
Sintering Temperature ◽  
Zinc Alloy ◽  
Alloy Composite ◽  
Constant Composition ◽  
Copper Zinc ◽  
Natural Carbon

Powder metallurgy technique were proved successful net-shape technology which suitable for the production of steel parts characterised by good physical and mechanical properties of MMCs. The aim of this work is to study the effect of the sintering temperature with different volume ratio of natural carbon fibers reinforced copper-zinc alloy via powder metallurgy route. In this study, water hyacinth was used as a natural carbon fiber to replace tin element. The samples were mixed in different volume fraction of natural carbon fiber which is 0%, 5%, 10% and 15% in constant composition of copper alloy (70Cu/30Zn). The mixture was consolidated into rigid die compaction at 300MPa, then sintered at 400, 550 and 750°C respectively in the furnace under Argon atmospheric pressure at a flow rate of 50ml/min for 2h and cooled down naturally under Argon gas protection. Vickers hardness test were investigated. The composite were then characterized using optical microscope and scanning electron microscopy (SEM). The copper alloy composite reinforced with 10% carbon fiber at 550°C shows highest hardness strength which is about 112.0 HV.

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