Study of the densification, mechanical and magnetic properties of Ni–Zn ferrites sintered in a solar furnace

Gutiérrez-López, J.; Levenfeld, B.; Várez, A.; Pastor, J.Y.; Cañadas, Inmaculada; Rodríguez, J.

doi:10.1016/j.ceramint.2015.01.096

Cited by 10 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The density of conventionally sintered, slow‐cooled, and quenched samples was 87% of the theoretical value while solar‐sintered samples were 96% dense . SEM micrographs of slow‐cooled, solar‐sintered, and quenched samples are shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…Recently, we investigated the solar sintering of commercial Ni–Zn ferrite powders; the mechanical and magnetic properties were compared with those of similar material sintered in a conventional electrical furnace . Suitable sintering conditions with the solar furnace were found to be a sintering temperature of 1250°C for 30 min in air using a heating/cooling rate of 30°C/min.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrical and Magnetic Properties of NiZn Ferrite Prepared by Conventional and Solar Sintering

et al. 2016

View full text Add to dashboard Cite

The electrical properties of polycrystalline NiZn ferrite, Zn 0.44 Ni 0.38 Fe 2.18 O 4 , were investigated by impedance spectroscopy over the frequency and temperature ranges, 5 Hz to 2 MHz and 10 to 600 K and by magnetic permeability measurements at room temperature. Samples were sintered in either conventional or solar furnaces followed by quenching or slow cooling to ambient temperature. Depending on processing conditions, the room temperature electrical resistivity of conventionally-sintered samples varied by seven orders of magnitude, from 5 ohm cm for a sample Samples sintered in the solar furnace were much more conductive than ones that were slowcooled after conventional sintering and this is attributed to the relatively rapid cooling rate after exposure in the solar furnace, which preserved some of the oxygen deficiency present at high temperature. For the same reason, samples that were slow cooled in N 2 were also much more conductive. For conventionally-sintered samples of similar density, quenched samples had much higher imaginary permeability, attributed to their lower resistivity and higher eddy currents, than slow-cooled samples. Solar-sintered samples had higher real permeability than slow-cooled, conventionally-sintered ones mainly due to a combination of their lower resistivity and higher density, 96% compared to 86%.

show abstract

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Electrical and Magnetic Properties of NiZn Ferrite Prepared by Conventional and Solar Sintering

et al. 2016

View full text Add to dashboard Cite

show abstract

“…70 % improvement could be observed as compared to relative density. The achieved higher K IC values of 2.5 MPam −1/2 is also significantly higher as compared with ferrites sintered by conventional (0.85 MPam −1/2 ) or other special (1.24 MPam −1/2 ) method [19,20].…”

Section: Mechanical Propertiesmentioning

confidence: 83%

Co-Ni-Zn Ferrites Fabricated by Spark Plasma Sintering

Balla

Móczó

Károly

2019

Period. Polytech. Chem. Eng.

View full text Add to dashboard Cite

Ni 0,4 Co 0,2 Zn 0,4 Fe 2 O 4 spinel ferrites have been synthesized by precipitation method from an aqueous solution and bulk samples were fabricated by Spark Plasma Sintering (SPS) to investigate the microstructure and the mechanical properties. Although SPS is considered as a rapid compaction technique, its application is uncommon for ferrites due to reactions occurring between the graphite die and the ferrite powder at elevated temperature. In our tests this problem was circumvented by an alumina film applied on the die. We found that both chemical and phase composition could be retained in the sintered specimens after sintering. In addition, they exhibited improved mechanical properties in terms of hardness (10 GPa) and fracture toughness (2.7 MPa · m −1/2 ) as compared to conventionally sintered reference samples.

show abstract

“…There are reports available which support that surface structure and magnetic properties are strongly related to each other [9][10][11][12]. The electrical and magnetic properties of ferrites have been reported to be strongly dependent on the purity of the starting ferrite powder, the microstructure as well as the grain boundary chemistry [1,2,9,13]. Typically, high purity, uniform composition and * Author for correspondence (aliphysics1@gmail.com) good microstructure properties that developed are essential for the high performance of the ferrites [1,[14][15][16].…”

Section: Introductionmentioning

confidence: 98%

“…The reduction in the particle size of these ferrites leads to the variation in higher values of coercivity [7], lower values of saturation magnetization and reduced or enhanced magnetic moments [8], etc. There are reports available which support that surface structure and magnetic properties are strongly related to each other [9][10][11][12]. The electrical and magnetic properties of ferrites have been reported to be strongly dependent on the purity of the starting ferrite powder, the microstructure as well as the grain boundary chemistry [1,2,9,13].…”

Section: Introductionmentioning

confidence: 99%

Cu2+ and Al3+ co-substituted cobalt ferrite: structural analysis, morphology and magnetic properties

et al. 2016

View full text Add to dashboard Cite

Cu-Al substituted Co ferrite nanopowders, Co 1−x Cu x Fe 2−x Al x O 4 (0.0 ≤ x ≤ 0.8) were synthesized by the co-precipitation method. The effect of Cu-Al substitution on the structural and magnetic properties have been investigated. X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) are used for studying the effect of variation in the Cu-Al substitution and its impact on particle size, magnetic properties such as M s and H c. Cu-Al substitution occurs and produce a secondary phase, α-Fe 2 O 3. The crystallite size of the powder calcined at 800 • C was in the range of 19-26 nm. The lattice parameter decreases with increasing Cu-Al content. The nanostructural features were examined by FESEM images. Infrared absorption (IR) spectra shows two vibrational bands; at around 600 (v 1) and 400 cm −1 (v 2). They are attributed to the tetrahedral and octahedral group complexes of the spinel lattice, respectively. It was found that the physical and magnetic properties have changed with Cu-Al contents. The saturation magnetization decreases with the increase in Cu-Al substitution. The reduction of coercive force, saturation magnetization and magnetic moments are may be due to dilution of the magnetic interaction.

show abstract

Study of the densification, mechanical and magnetic properties of Ni–Zn ferrites sintered in a solar furnace

Cited by 10 publications

References 17 publications

Electrical and Magnetic Properties of NiZn Ferrite Prepared by Conventional and Solar Sintering

Electrical and Magnetic Properties of NiZn Ferrite Prepared by Conventional and Solar Sintering

Co-Ni-Zn Ferrites Fabricated by Spark Plasma Sintering

Cu2+ and Al3+ co-substituted cobalt ferrite: structural analysis, morphology and magnetic properties

Contact Info

Product

Resources

About