Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization

Pubby, Kunal; Meena, Sher Singh; Yusuf, S.M.; Narang, Sukhleen Bindra

doi:10.1016/j.jmmm.2018.07.038

Cited by 122 publications

(22 citation statements)

References 53 publications

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“…Resistance increases sharply at initial stage and step by step with a series of temperature resistance decreases. Figure 8a, c shows lower resistance with increase in temperature because of increasing flow mobility of the charge moving or due to lattice vibrations associated with growing temperature, where the atoms often come closely sufficient for the transfer of the rate carriers and the conduction is initiated with the aid of lattice vibration [47,48] (Table 2). Figure 8b, d shows the plot of log R against 1/T form which the activation energy has been investigated for low-and high-temperature region.…”

Section: Electrical Resistivity and Temperature Effect On Ferrite Senmentioning

confidence: 99%

Nanocrystalline-modified nickel ferrite films: an effective sensor for industrial and environmental gas pollutant detection

Koli¹,

Kapadnis²,

Deshpande³

2019

J Nanostruct Chem

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The inverse spinel nanocrystalline pure and doped nickel ferrite particles were synthesized by co-precipitation method. The thick films of both pure and doped nickel ferrite nanoparticles were prepared by coating the material on glass substrate via screen printing method. The XRD was used to confirm cubic, crystalline nickel ferrites. The scanning electron microscopy confirms nanosized, cubic nanoparticles of nickel ferrite, and their morphology was investigated. The energy-dispersive spectroscopy was used to comprise elemental composition for pure and doped ferrites. Transmission electron microscopy was attributed for investigation of surface morphology, crystal structure identification of nickel ferrites. The FT-IR was used to find the vibrational frequencies, symmetric, asymmetric stretching and bending modes of metal oxide linkage. The thick films of nickel ferrite were employed for sensing phenomenon of gases such as LPG, NO 2 , CH 3-OH, C 2 H 5-OH, NH 3 and petrol vapours. The pure nickel ferrite showed excellent results for ammonia and nitrogen dioxide gases up to 90.42 and 86.42, respectively. Manganese-and cobalt-doped ferrites were excellent for ammonia and petrol vapours. Modified nickel ferrite effect of dopants cobalt and manganese was investigated. Pure and doped ferrites showed excellent response and recovery for ammonia, NO 2 , petrol vapours and LPG gases.

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Section: Electrical Resistivity and Temperature Effect On Ferrite Senmentioning

confidence: 99%

Nanocrystalline-modified nickel ferrite films: an effective sensor for industrial and environmental gas pollutant detection

Koli¹,

Kapadnis²,

Deshpande³

2019

J Nanostruct Chem

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“…At most recent, Stein et al [9] synthesized CoFe 2 O 4 nanoparticles and discussed the superparamagnetic nature of CoFe 2 O 4 nanoparticles. Besides, the Co-Ni ferrites [10], Li-Co ferrites [11], Co-Cr ferrites [12], Zn-Co ferrites [13], Cd-Co ferrites [1] etc., Studied for the development of electrical and magnetic properties of CoFe 2 O 4 . In the present study, the authors intended to prepare and characterize the Cd-Co nanoferrites via citrate-gel autocombustion method.…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological and electronic properties of cadmium cobalt ferrite nanoparticles

2019

Biointerface Res Appl Chem

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Cadmium cobalt ferrite nanoparticles with a chemical formula of CdxCo1-xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 & 0.6) (CCF) were prepared via the citrate-gel auto combustion method followed by annealing at 773 Kelvin for 4 hrs in air. Further, the samples were characterized for structural, morphological, elemental, functional group, electrical and thermoelectric properties analysis. The X-ray diffraction patterns showed the single phase cubic structure. The crystalline size of the synthesized Co-Cd ferrites nanoparticle is found in the range of 11 to17 nm. In addition, with an increase of Cd content, we noticed that lattice constants (a) and x-ray density (dx) values were increasing from 0.8419 – 0.8496 nm and 5.222 – 5.777 g/c.c., respectively. Morphological properties were examined by scanning electron microscopy (SEM) & Transmission electron microscopy (TEM). The tetrahedral (υ1) and octahedral (υ2) frequencies were observed at around 400 - 600 cm-1. The electric and dielectric properties such as DC-electrical conductivity (σdc), dielectric constant (ε'), dielectric loss (ε") and thermoelectric power parameters were calculated. At a low temperature of 300 K, the samples express the p-type semiconducting nature due to having +ve value of ‘S’ while the same shows –ve value at high temperature suggesting the n-type semiconducting behavior. Moreover, the magnetic Curie-transition temperatures were determined as a function of composition and noted to be decreasing from 753 – 653 K respectively.

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“…In the present case, spinel ferrites with chemical formula Ni1-xCoxFe2O4 (x =0.0, 0.3, 0.6, 0.9) are used as magneto-dielectric substrate for the antenna. The electromagnetic properties, which are used for the simulation of antenna have already been reported elsewhere [23].…”

Section: A Selection Of the Materials For Substratementioning

confidence: 99%

“…The rectangular microstrip patch antenna is designed by using selective four ferrite samples (NC 0.00, NC 0.30, NC 0.60 and NC 0.90) as substrate. The parameters required for design rectangular patch antenna such as are permittivity (εr), dielectric loss tangent (tan δe), permeability (µr) and magnetic loss tangent (tan δm) at operating frequency 10.02 were determined using Vector Network Analyzer (VNA) and are presented in Table 1 [23]. Using the values of εr and µr the length of antenna is determined by formula [25]: Lpat=c/2fr√μrεr, where c is the velocity of light in free space.…”

Section: B Determination Of Patch Dimensions (Lpat and Wpat)mentioning

confidence: 99%

“…The samples under investigation were prepared using sol-gel auto-combustion route. The structural and X-band electromagnetic characterization of these samples has already been reported [23]. In this communication, the X-band complex permittivity and permeability values of the compositions was used to determine the antenna parameters.…”

Section: Introduction (Heading 1)mentioning

confidence: 99%

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Ni_0.1Co_0.9Fe₂O₄ spinel ferrite as a promising magneto-dielectric substrate for X-band Microstrip Patch Antenna

Pubby

Narang

Bhongale³

et al. 2020

American Journal of Electronics & Communication

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In the present study, the suitability of Ni-Co spinel ferrites as dielectric substrate for microstrip patch antenna has been reconnoitered in X-band frequency range. The scrutinized spinel ferrites with chemical composition Ni1-xCoxFe2O4 (x=0.00,0.30,0.60,0.90) were synthesized using Pechini's sol gel method. For the present study, Ansoft Designer SV2 was used to design and analyze the microstrip patch antenna. Simulation of antenna was done at resonant frequency of 10.02 GHz, which makes this research to find application in military and surveillance. Firstly, the antenna dimensions were calculated using resonant frequency and electromagnetic properties of the compositions. The antenna output parameters such as return loss, bandwidth, VSWR (Voltage Standing Wave Ratio), Smith Chart and radiation pattern were subsequently analyzed by the simulation Based on the analysis, Ni-Co ferrite Ni0.1Co0.9Fe2O4 has come out to be the best alternative out of the studied compositions for its possible usage as efficient dielectric substrate in microstrip patch antenna in 8.2-12.4 GHz frequency range.

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Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization

Cited by 122 publications

References 53 publications

Nanocrystalline-modified nickel ferrite films: an effective sensor for industrial and environmental gas pollutant detection

Nanocrystalline-modified nickel ferrite films: an effective sensor for industrial and environmental gas pollutant detection

Structural, morphological and electronic properties of cadmium cobalt ferrite nanoparticles

Ni_0.1Co_0.9Fe₂O₄ spinel ferrite as a promising magneto-dielectric substrate for X-band Microstrip Patch Antenna

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Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization

Cited by 122 publications

References 53 publications

Nanocrystalline-modified nickel ferrite films: an effective sensor for industrial and environmental gas pollutant detection

Nanocrystalline-modified nickel ferrite films: an effective sensor for industrial and environmental gas pollutant detection

Structural, morphological and electronic properties of cadmium cobalt ferrite nanoparticles

Ni0.1Co0.9Fe2O4 spinel ferrite as a promising magneto-dielectric substrate for X-band Microstrip Patch Antenna

Contact Info

Product

Resources

About

Ni_0.1Co_0.9Fe₂O₄ spinel ferrite as a promising magneto-dielectric substrate for X-band Microstrip Patch Antenna