High temperature dielectric studies of indium-substituted NiCuZn nanoferrites

Hashim, Mohd.; Raghasudha, M.; Shah, Jyoti; Shirsath, Sagar E.; Ravinder, D.; Kumar, Shalendra; Meena, Sher Singh; Bhatt, Pramod; Alimuddin, Alimuddin; Kumar, Rahul; Kotnala, R.K.

doi:10.1016/j.jpcs.2017.08.022

Cited by 44 publications

(17 citation statements)

References 19 publications

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“…This was as a result of cationic replacement by larger ionic radii Cd 2+ (0.99 Å) in to smaller ionic radii Co 2+ ions (0.78 Å). This proportional variation indicated that the Co-Cd ferrite system agreement of Vegard's law [7]. Furthermore, with the help of a formula: d x = ZM/Na 3 , the theoretical density (d x ) was calculated, where 'Z' is the number of effective atoms per unit-cell, 'M' is the compositional molecular weight, 'N' is Avogadro's number (6.023 x 10 23 ) and 'a' is the lattice constant [12].…”

Section: Xrd Analysismentioning

confidence: 64%

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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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Section: Xrd Analysismentioning

confidence: 64%

“…Ferrites are generally AB 2 O 4 (A refers some divalent cations and B indicates Fe 3+ ) spinel structured materials [6,7]. Several scientists focused on reporting the different properties of these ferrites and ferrite based specimen.…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological and electronic properties of cadmium cobalt ferrite nanoparticles

2019

Biointerface Res Appl Chem

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“…As frequency goes on increasing, the pure SA, SA2, SA3 shows similar behavior i.e. they exhibit increasing of ε′ and ε″ values at particular frequency instead of usual dielectric behavior [24][25][26]. In general, the polycrystalline materials are composed of two segments such as grains and grain boundaries.…”

Section: Temperature Dependence Of ε′ and ε″mentioning

confidence: 97%

Preparation, characterization and dielectric properties of sodium alginate/titanium dioxide composite membranes

2018

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Sodium alginate/titanium dioxide solid polymer composite membranes were prepared by solution casting method. The electrical, optical and thermal properties of these composite membranes are in great demand for advanced electronic device applications. The present study is aimed at the preparation of dioxide membranes to enhance the conductivity of sodium alginate. The diffraction pattern confirmed the change of sodium alginate polymer matrix structure from amorphous to polycrystalline upon dispersing TiO 2 powder particles into sodium alginate solution. The surface morphology also evidenced the non-crystalline and polycrystalline (containing grains and grain boundaries) nature of formed films. The infrared spectra showed the presence of various functional groups such as-OH, C=O, O-H, C-H and Na-O. The differential scanning calorimeter (DSC) investigation revealed the existence of exothermic/endothermic peaks, melting and crystallization temperatures. Furthermore, the weight loss of all the films was described as a function of temperature. The dielectric properties highlighted the 5 wt% of TiO 2 dispersed in the sodium alginate solution due to its high dielectric constant (ε′), dielectric loss (ε″) and ac-electrical conductivity (σ ac).

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“…25,26 The results revealed that the "D" value was noted to be decreasing from 29 to 22 nm with increase of Zn-content in the CF system. 33 The present behavior of d x is obtained as a result of decrease of molecular weight with increase of dopant concentration. 27 In addition, the lattice constants (a, b, & c) were found to be equal (a = b = c) and the achieved value was observed to be increasing with the increase of zinc content from 0.838 to 0.849 nm.…”

Section: Resultsmentioning

confidence: 80%

“…Besides, the X-ray density (d x ) of CZF nanoparticles was found to be decreasing from 5.31 to 5.23 g/c.c using the formula: ZM/Na 3 , herein "Z" indicates the effective number of atoms per unit cell (8), "M" is associated to the compositional molecular weight, "N" is the Avogadro's number, and "a" is lattice parameter of content. 33 The present behavior of d x is obtained as a result of decrease of molecular weight with increase of dopant concentration. Moreover, this kind of nature was noticed in the literature.…”

Section: Methodsmentioning

confidence: 80%

Magnetic and antimicrobial properties of cobalt‐zinc ferrite nanoparticles synthesized by citrate‐gel method

Vinuthna

Naidu

et al. 2019

Int J Applied Ceramic Tech

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The cobalt‐zinc ferrite (CZF) nanomaterials were prepared by citrate‐gel method, and further calcined at 600°C. The single‐phase cubic spinel structure of CZF was confirmed using the X‐ray diffraction pattern. The average crystallite size was found to be in the range of 22‐29 nm. The surface morphology was examined using the scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The average particle size of Co0.6Zn0.4Fe2O4 was determined to be 19 nm using TEM study which is supporting the average crystallite size measured from the X‐ray diffraction studies. The Fourier‐transform infrared spectra revealed the two strong absorption bands in the series of ferrites between 4500 and 500 cm−1 and these are responsible for the characteristic of spinel ferrites. The presence of elements Cu, Zn, and Co of CZF was confirmed by the elemental spectral signals of energy dispersive spectroscopy. At room temperature, the magnetic measurements of pure ZnFe2O4 and Co0.6Zn0.4Fe2O4 were evaluated based on hysteresis curves (M‐H curves). The results expressed that the addition of nonmagnetic Zn2+ ions increases the magnetic behavior in the mixed CZF samples. The antimicrobial activity of the ZnFe2O4 and Co0.6Zn0.4Fe2O4 nanoferrites was tested against harmful microbes.

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High temperature dielectric studies of indium-substituted NiCuZn nanoferrites

Cited by 44 publications

References 19 publications

Structural, morphological and electronic properties of cadmium cobalt ferrite nanoparticles

Structural, morphological and electronic properties of cadmium cobalt ferrite nanoparticles

Preparation, characterization and dielectric properties of sodium alginate/titanium dioxide composite membranes

Magnetic and antimicrobial properties of cobalt‐zinc ferrite nanoparticles synthesized by citrate‐gel method

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