Microwave sintering of Ni–Zn ferrites: comparison with conventional sintering

Yadoji, Purushotham; Peelamedu, Ramesh; Agrawal, Dinesh Kumar; Roy, Rustum

doi:10.1016/s0921-5107(03)00063-1

Cited by 287 publications

(156 citation statements)

References 26 publications

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“…Recently, the beneficial role of microwave on the low-temperature firing and reaction during microwave hybrid heating has been reported. Yadoji et al [25] reported that microwave heating generates heat within the material first and then heats the entire volume. This heating mechanism is advantageous to rapid heating rate, uniform heating, high efficiency, and reduced cost [25,26].…”

Section: Phase Assemblage Of the Synthesized Productsmentioning

confidence: 99%

“…Yadoji et al [25] reported that microwave heating generates heat within the material first and then heats the entire volume. This heating mechanism is advantageous to rapid heating rate, uniform heating, high efficiency, and reduced cost [25,26]. The synthesis temperature and time decrease due to the effect of heating mechanism during microwave sintering.…”

Section: Phase Assemblage Of the Synthesized Productsmentioning

confidence: 99%

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Synthesis of high-purity Ti2SC powder by microwave hybrid heating

Guan

Sun

2016

J Adv Ceram

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Abstract:A novel simple method is presented to synthesize high-purity Ti 2 SC powder using Ti/C/S and Ti/C/TiS 2 systems by microwave hybrid heating at different temperatures in argon atmosphere. It was confirmed that the synthesis temperature is strongly dependent on the starting composition. For Ti/C/S system, Ti 2 SC with small amounts of TiS and TiC was synthesized at 1200 ℃. For Ti/C/TiS 2 system, high-purity Ti 2 SC was synthesized at 800 ℃ and above. The synthesis of Ti 2 SC powder at low temperature was attributed to the combination of microwave effect by microwave hybrid heating and the introduction of TiS 2 as sulfur source. Scanning electron microscopy (SEM) analysis indicated that the layered structure of Ti 2 SC particles is perfectly formed at 1100 ℃, and the crystal particle size approaches to homogeneity which is about 2-5 μm. It was presumed that the formation mechanism of Ti/C/TiS 2 system is that TiS 2 firstly reacts with Ti to form Ti-S intermetallics, then Ti-S intermetallics reacts with un-reacted Ti and graphite to produce Ti 2 SC.

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Section: Phase Assemblage Of the Synthesized Productsmentioning

confidence: 99%

Section: Phase Assemblage Of the Synthesized Productsmentioning

confidence: 99%

Synthesis of high-purity Ti2SC powder by microwave hybrid heating

Guan

Sun

2016

J Adv Ceram

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“…The physical properties of ferrites are dependent on several factors such as the preparation method, sintering process, and the type and amount of constituent elements or additives (Yadoji et al 2003). There are two main factors which cause nanomaterials to behave significantly differently from bulk materials: (I) surface effects (causing a smooth scaling of properties due to the fraction of atoms on the surface) and (II) quantum effects (showing discontinuous behavior due to quantum confinement effects in materials with delocalized electrons) (Roduner 2006).…”

Section: Introductionmentioning

confidence: 99%

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Chaudhari¹,

Gaikwad

Acharya

2014

Appl Nanosci

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In the present work, microwave-assisted coprecipitation route was used for synthesis of nanocrystalline zinc ferrite and results were compared with conventionally prepared zinc ferrite. Synthesis conditions were kept uniform in both cases, except that the mode of heating was changed. The effects of mode of heating on the material properties were studied systematically. Microstructures of both samples were studied by scanning electron microscopy and transmission electron microscopy and the particle size was found to be in the range of 3-4 nm. Particle size distribution in microwaveprocessed MS-ZnFe 2 O 4 is found to be highly uniform compared to conventionally processed samples (CS-ZnFe 2 O 4 ). XRD data confirmed the presence of single-phase face-centered cubic structure for both the samples. The XRD data fitted well with Reitveld refinement. The functional groups were analyzed by FT-IR. Local distortions in the structures were studied by FT-Raman spectra of zinc ferrites at room temperature. This study concludes that the microwaveassisted synthesis route reduced the time of reaction by around 23 h and developed uniformly distributed fine-scaled particles. This method has high potential to synthesize other ferrite materials also.

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“…Generally, Microwave processing microstructures possess smaller grain size in comparison with conventional process [6,7]. Many ferrites have been microwave heated and their dielectric and magnetic properties with respect to microstructures have also been studied [8][9][10][11][12]. Another method for reducing eddy current loss is, modifying the grain boundary region by adding suitable additives which promote liquid phase sintering and forms as an insulating layer at the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Influence of additives on the structural, electrical and elastic properties of nanocrystalline MgCuZn ferrites

2015

Appl. Sci. Lett.

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Lead oxide (PbO) and Tantalum pentoxide (Ta2O5) added Mg0.2Cu0.3Zn0.5 Fe2O4 spinel ferrites are prepared by the microwave hydrothermal method. The prepared powders are characterized by powder X-ray diffraction (XRD), Infrared spectroscopy (IR), Transmission electron microscopy (TEM) and Differential scanning calorimeter (DSC). Monophase nanocrystalline ferrites of ~10 to 20nm size are prepared at a lower processing temperature of 160°C/1hour. The ferrites are sintered to a temperature of 900°C using microwave sintering (MW) method. The influence of additives on structure, densification, microstructure and electrical resistivity is studied. The addition of PbO to ferrite improves sintered density and resistivity compared to Ta2O5. The ultrasonic pulse transmission method is used to determine the elastic properties of the sintered ferrites. Elastic moduli such as Young's modulus (E), bulk modulus (B), modulus of rigidity (G), Poisson's ratio (σ) and Debye temperature (θD) are computed from the measured ultrasonic wave velocities. The elastic moduli of ferrite materials increase with PbO and decrease with Ta2O5 content, whereas Poisson's ratio almost remains constant. A linear relationship between Debye temperature and average sound velocity is observed.

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Microwave sintering of Ni–Zn ferrites: comparison with conventional sintering

Cited by 287 publications

References 26 publications

Synthesis of high-purity Ti2SC powder by microwave hybrid heating

Synthesis of high-purity Ti2SC powder by microwave hybrid heating

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Influence of additives on the structural, electrical and elastic properties of nanocrystalline MgCuZn ferrites

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