Structural, Dielectric, and Magnetic Characterization of Nanocrystalline Ni–Co Ferrites

Khan, Kishwar; Maqsood, Asghari; Anis-ur-Rehman, M.; Malik, Muhammad Ali; Akram, Muhammad

doi:10.1007/s10948-011-1247-9

Cited by 19 publications

(8 citation statements)

References 12 publications

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“…(Table 4) due to decrease in thermal fluctuation effects on the magnetic ions. The saturation magnetization value at RT was found to be 54.236 emu g -1 which is in agreement with the reported value of *54 emu g -1 [57,58]. The remanent magnetization and coercivity also show a sharp increase with decrease in temperature.…”

Section: Electrical Resistivitysupporting

confidence: 90%

Preparation, spectroscopic and thermal analysis of hexa-hydrazine nickel cobalt ferrous succinate precursor and study of solid-state properties of its nanosized thermal product, Ni0.5Co0.5Fe2O4

Coutinho

Verenkar

2016

J Therm Anal Calorim

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Nickel cobalt ferrite, Ni 0.5 Co 0.5 Fe 2 O 4 , has been prepared by precursor combustion technique from hexahydrazine nickel cobalt ferrous succinate precursor. The precursor was characterized by chemical analysis, CHNS analysis, infrared spectroscopy, TG-DTA and mass loss studies. The thermal data show how the precursor decomposes in four steps to give stable ferrite phase. The precursor decomposes autocatalytically once initially ignited, to give the 'as-prepared' nano-spinel ferrite. The X-ray diffraction analysis reveals single cubic spinel phase structure. The infrared measurements between 4000 and 350 cm -1 confirmed the intrinsic cation vibrations of the spinel structure. The SEM image clearly shows the nanosized nature of the ferrite. The dielectric constant and loss tangent are found to decrease with increase in frequency which is due to Maxwell-Wagner interfacial polarization. The loss tangent shows a relaxation peak at *1 kHz. The variation of DC electrical resistivity with temperature indicates semiconductor behaviour. The temperature-and field-dependent magnetization data of 'as-prepared' ferrite reveal that the lattice has either a canted or partially misaligned spin structure due to the nanosized nature of the ferrite.

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Section: Electrical Resistivitysupporting

confidence: 90%

Preparation, spectroscopic and thermal analysis of hexa-hydrazine nickel cobalt ferrous succinate precursor and study of solid-state properties of its nanosized thermal product, Ni0.5Co0.5Fe2O4

Coutinho

Verenkar

2016

J Therm Anal Calorim

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“…The satura-tion magnetization values of both samples were similar and the slightly higher coercivity of the LPS sample may be attributed to: the smaller grains (higher grain boundary area) [26]. Additionally, Table V shows M s values of chemically synthesized Ni x Co 1-x Fe 2 O 4 ferrites from different sources [6,7,10,27,28]; all these works show a tendency of M s increasing values with the raise of cobalt content. In Fig.…”

Section: Resultsmentioning

confidence: 69%

“…Their electromagnetic and magnetostrictive properties are suitable for applications in high-frequency devices [3], magnetic field sensors [4] and magnetoelectric transducers [5]. The substitution of Ni for Co, as in Ni 1-x Co x-Fe 2 O 4 , is known to increase the saturation magnetization and magnetostriction magnitudes of these ferrites [6,7]. The suitable magnetostrictive properties of these materials led Sedlar et al [4] to study the performance of Ni and Ni-Co ferrite in a magnetic field sensor and the best results were obtained for the Ni-Co ferrite.…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of a Ni-Co ferrite for sensor applications

et al. 2015

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Ni-Co ferrites are magnetostrictive ceramics that have potential application in magnetostrictive/ magnetoelastic sensors, as well as in magnetoelectric composites. Ni-rich Ni-Co spinel ferrite samples were processed by the ceramic method and bulk samples were sintered at 1350 ºC in the solid state and at 950 ºC with Bi2O3 liquid phase. The sintered samples were characterized by light microscopy, scanning electron microscopy, Raman spectroscopy, vibrating sample magnetometry and capacitance dilatometry. With Bi2O3 additions as small as 0.6 mol% it was possible to sinter the Ni-Co ferrite at 950 ºC, obtaining high-density samples; however, such liquid-phase sintered samples presented iron oxide particles. The studied samples presented magnetoelastic sensitivities very close to CoFe2O4, with significantly lower magnetic hysteresis. The results thus indicate that the magnetic properties of the samples analyzed are suitable for applications in magnetomechanical sensors.

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“…The large dielectric constant values at low frequencies can also be related to the interfacial dislocation pileup, oxygen vacancies, grain-boundary defects, and so on. Beyond a certain frequency that is at higher frequencies, the exchange of electrons between Fe 3+ and Fe 2+ ions could not follow the applied alternating field [21].…”

Section: Dielectric Constantmentioning

confidence: 99%

Magnetic and Electrical Properties of Magnesium-Substituted Ni–Zn Ferrites

Kavitha

Manohar

2016

J Supercond Nov Magn

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The effect of magnesium substitution in Ni-Zn ferrites (Ni 0.80−x Mg x Zn 0.20 Fe 2 O 4 , where x = 0, 0.10-0.50) was studied on its electrical and magnetic properties. Ni-Mg-Zn ferrites were synthesized by novel combustion method, followed by calcination at 900 • C. The X-ray diffraction (XRD) pattern shows that the prepared sample was a single-phase spinel cubic structure, and the calculated crystallite sizes were found to be in the range 44-48 nm. Fourier transform infrared spectroscopy (FTIR) spectra confirm the tetrahedral and octahedral modes of vibrations. The observed saturation magnetization values range from 37 to 63 emu/g for magnesium-added Ni-Zn ferrites. The increase in resistivity was observed with the addition of magnesium ions except for the concentration of x = 0.50. The change in dielectric behavior with respect to composition and frequency were studied.

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Structural, Dielectric, and Magnetic Characterization of Nanocrystalline Ni–Co Ferrites

Cited by 19 publications

References 12 publications

Preparation, spectroscopic and thermal analysis of hexa-hydrazine nickel cobalt ferrous succinate precursor and study of solid-state properties of its nanosized thermal product, Ni0.5Co0.5Fe2O4

Preparation, spectroscopic and thermal analysis of hexa-hydrazine nickel cobalt ferrous succinate precursor and study of solid-state properties of its nanosized thermal product, Ni0.5Co0.5Fe2O4

Processing and characterization of a Ni-Co ferrite for sensor applications

Magnetic and Electrical Properties of Magnesium-Substituted Ni–Zn Ferrites

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