Structural, dielectric and magnetic properties of cobalt ferrite prepared using auto combustion and ceramic route

Murugesan, C.; Murugesan, P.; Chandrasekaran, G.

doi:10.1016/j.physb.2014.04.055

Cited by 68 publications

(19 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This promotes the electron hopping between two adjacent octahedral sites (B-sites) and a transition between Fe 2+ and Fe 3+ , thereby increasing the hopping conduction. Therefore a gradual increase in conductivity was observed with increasing frequency [12,27].…”

Section: Ac Conductivitymentioning

confidence: 94%

Dielectric properties of nanocrystalline Co-Mg ferrites

Sharma

Parashar

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Ac Conductivitymentioning

confidence: 94%

Dielectric properties of nanocrystalline Co-Mg ferrites

Sharma

Parashar

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…These small values of <D XRD > revealed a significant advantage of the auto-combustion synthesis compared to the more conventional ceramic methods in order to produce ferrite particles: the lower temperature and shorter time used in the auto-combustions synthesis resulted in the grains' smaller diameter with a greater surface area [70,71], preventing the particles from coarsening and aggregating, which is promoted by the very high temperature (T > 1000 • C) typically used in the ceramic methods.…”

Section: Structural Propertiesmentioning

confidence: 99%

Specific Loss Power of Co/Li/Zn-Mixed Ferrite Powders for Magnetic Hyperthermia

Barrera

Celegato

Martino

et al. 2020

Sensors

View full text Add to dashboard Cite

An important research effort on the design of the magnetic particles is increasingly required to optimize the heat generation in biomedical applications, such as magnetic hyperthermia and heat-assisted drug release, considering the severe restrictions for the human body’s exposure to an alternating magnetic field. Magnetic nanoparticles, considered in a broad sense as passive sensors, show the ability to detect an alternating magnetic field and to transduce it into a localized increase of temperature. In this context, the high biocompatibility, easy synthesis procedure and easily tunable magnetic properties of ferrite powders make them ideal candidates. In particular, the tailoring of their chemical composition and cation distribution allows the control of their magnetic properties, tuning them towards the strict demands of these heat-assisted biomedical applications. In this work, Co0.76Zn0.24Fe2O4, Li0.375Zn0.25Fe2.375O4 and ZnFe2O4 mixed-structure ferrite powders were synthesized in a ‘dry gel’ form by a sol-gel auto-combustion method. Their microstructural properties and cation distribution were obtained by X-ray diffraction characterization. Static and dynamic magnetic measurements were performed revealing the connection between the cation distribution and magnetic behavior. Particular attention was focused on the effect of Co2+ and Li+ ions on the magnetic properties at a magnetic field amplitude and the frequency values according to the practical demands of heat-assisted biomedical applications. In this context, the specific loss power (SLP) values were evaluated by ac-hysteresis losses and thermometric measurements at selected values of the dynamic magnetic fields.

show abstract

“…Each RQ element consists of a resistance R and a constant phase elements (CPE) Q representing one of the non-ideal semicircles. According to the brick layer model of microcrystalline ceramic materials, [43][44][45][46][47] the semicircle in the high frequency range is interpreted as the transport process inside the crystallites, i.e. the bulk properties, while the semicircle at lower frequencies represents the transport process across the grain boundaries.…”

Section: Impedance Measurementsmentioning

confidence: 99%

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe₂O₄)

2019

View full text Add to dashboard Cite

Monophasic nano-crystalline CoFe 2 O 4 (CFO) nanoparticles of high purity have been synthesised through a low temperature hydrothermal route, which does not involve hazardous chemicals, or conditions. The easy, green procedure involves a hydrothermal treatment at 135 C of an aqueous suspension of the oxalate salts of the precursors. No further purification or annealing procedure was necessary to obtain the crystalline nano-structured oxide. The nanoparticles were characterized structurally and chemically by powder X-ray diffraction (PXRD), Inductively Coupled Plasma Spectrometry (ICP-MS) and Scanning Electron Microscopy (SEM), thus confirming the successful synthesis of the CoFe 2 O 4 particles with the expected crystal phase and stoichiometry and an almost complete inverse spinel structure. From the nanoparticles pellets were pressed to investigate the electronic conduction properties using electrochemical impedance spectroscopy (EIS). At low temperatures, the conductivity measurements reveal a semiconducting behavior originating from hopping between Co sites and a total conductivity dominated by the grain boundary contribution. At higher temperatures (T > 400 C) a metallic-insulator transition occurs, which is attributed to additional hopping of electrons between the Fe sites.

show abstract

Structural, dielectric and magnetic properties of cobalt ferrite prepared using auto combustion and ceramic route

Cited by 68 publications

References 18 publications

Dielectric properties of nanocrystalline Co-Mg ferrites

Dielectric properties of nanocrystalline Co-Mg ferrites

Specific Loss Power of Co/Li/Zn-Mixed Ferrite Powders for Magnetic Hyperthermia

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe₂O₄)

Contact Info

Product

Resources

About

Structural, dielectric and magnetic properties of cobalt ferrite prepared using auto combustion and ceramic route

Cited by 68 publications

References 18 publications

Dielectric properties of nanocrystalline Co-Mg ferrites

Dielectric properties of nanocrystalline Co-Mg ferrites

Specific Loss Power of Co/Li/Zn-Mixed Ferrite Powders for Magnetic Hyperthermia

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe2O4)

Contact Info

Product

Resources

About

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe₂O₄)