AC Conducitivity in Bismuth-Substituted Barium Hexaferrites

Pal, M.; Brahma, P.; Chakravorty, D.

doi:10.1143/jpsj.63.3356

Cited by 15 publications

(10 citation statements)

References 14 publications

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“…However, for the ZnO/TiO 2 :7 wt% pellet, the electrode effect is not observed. In the other work, the resistivity of the polycrystalline material decreases with the increase in grain size . Therefore, we have found that the sample doped with 3 wt% of TiO 2 content has the lowest value of resistivity, thus, less grain boundary.…”

Section: Resultsmentioning

confidence: 67%

“…In the other work, the resistivity of the polycrystalline material decreases with the increase in grain size. 68,69 Therefore, we have found that the sample doped with 3 wt% of TiO 2 content has the lowest value of resistivity, thus, less grain boundary. M. Chaari et al 70 have fabricated zinc oxide ceramics sintered at various temperatures (700°C-1000°C) by solid-state route.…”

Section: Impedance Analysismentioning

confidence: 90%

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Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Belgacem¹,

Chaari²,

Braña

et al. 2017

J Am Ceram Soc

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ZnO/TiO2 composite ceramics have been prepared by solid‐state reaction technique at 900°C. The X‐ray diffraction results revealed the formation of secondary phases referred to as spinel Zn2TiO4 and hexagonal ZnTiO3. The structural analysis showed that all the composites that have been prepared have a polycrystalline nature and a hexagonal wurtzite structure. The complex modulus (M) and electric impedance of the samples have been investigated by broadband dielectric spectroscopy in a wide range of temperature (40°C‐110°C) and frequency (0.1 Hz to 10 MHz). The modulus plots (M′′, M′) illustrate the presence of non‐Debye type of relaxations attributed to the effects of interfacial and dipolar polarizations. The real and the imaginary parts of the impedance are well fitted to equivalent circuit models. At high temperatures, Z″max varies from 0.03 × 106 to 4.9 × 106 Ω when the TiO2 doping concentration increases from 1 to 7 wt%. From the obtained results, the secondary phase ZnTiO3 plays an important role in the electrical properties.

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Section: Resultsmentioning

confidence: 67%

Section: Impedance Analysismentioning

confidence: 90%

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Belgacem¹,

Chaari²,

Braña

et al. 2017

J Am Ceram Soc

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“…This can be attributed to the decrease in grain size as a result of doping. In literature it has been reported that the resistivity of a polycrystalline material, in general, increases with the decrease in grain size as depicted in XRD [31,32]. Accordingly, smaller grains imply a larger number of insulating grain boundaries which act as a barrier to the flow of electrons.…”

Section: Impedance Analysismentioning

confidence: 99%

Structural and spectroscopic analysis of wurtzite (ZnO)1−x(Sb2O3)x composite semiconductor

Ullah

Iqbal

Zakria

et al. 2015

Progress in Natural Science: Materials International

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The structural, vibrational and impedance analysis for (ZnO) 1 À x (Sb 2 O 3 ) x composite synthesized by solid state reaction technique were carried out in the present investigation. X-ray diffraction (XRD) study showed that (ZnO) 1 À x (Sb 2 O 3 ) x composite has hexagonal (wurtzite) crystal structure. Variation in lattice constants with Sb-doping indicated the proper incorporation of Sb dopant in ZnO host matrix. The results of Raman spectroscopy test suggested the signature of E 2 (high) and E 1 (TO) Raman modes, and verified the wurtzite structure of (ZnO) 1 À x (Sb 2 O 3 ) x composite. Two additional phonon bands (671, 712) cm À 1 appeared in Raman spectra of composite samples due to the existence of the lattice defects caused by Sb doping or may be other intrinsic lattice defects formed during the synthesis of (ZnO) 1 À x (Sb 2 O 3 ) x composite. The frequency dependent on the electrical characteristics, such as, impedance (Z), dielectric constant (ε) and AC conductivity (σ) have been studied in a range of frequencies for different Sb concentration at room temperature. The electrical measurement results showed that the impedance increased with Sb dopant concentration, while dielectric constant and AC conductivity decreased with Sb dopant concentration.

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“…This technique is widely used to separate the resistive and capacitive components of electrical parameters and hence provides a clear picture of the features of the material. 18,19 Accordingly, smaller grains imply a larger number of insulating grain boundaries which act as a barrier to the flow of electrons. Generally, the grains are effective in high frequency region while the grain boundaries are effective in low frequency region.…”

Section: Impedance Analysismentioning

confidence: 99%

Investigation of electrical properties of Mn doped tin oxide nanoparticles using impedance spectroscopy

Azam

Ahmed

Chaman

et al. 2010

Journal of Applied Physics

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Articles you may be interested inEnhanced separation efficiency of photoinduced charges for antimony-doped tin oxide (Sb-SnO2)/TiO2 heterojunction semiconductors with varied Sb doping concentration Manganese doped tin oxide nanoparticles with manganese content varying from 0 to 15 mol % were synthesized using sol-gel method. The structural and compositional analysis was carried out using x-ray diffraction ͑XRD͒, scanning electron microscope ͑SEM͒, and energy dispersive x-ray analysis ͑EDAX͒. Dielectric and impedance spectroscopy was carried out at room temperature to explore the electrical properties of Mn doped SnO 2 . XRD analysis indicated the formation of single phase rutile type tetragonal structure of all the samples. The crystallite size was observed to vary from 16.2 to 7.1 nm as the Mn content was increased. The XRD, SEM, and EDAX results corroborated the successful doping of Mn in the SnO 2 matrix. Complex impedance analysis was used to distinguish the grain and grain boundary contributions to the system, suggesting the dominance of grain boundary resistance in the doped samples. The dielectric constant Ј, dielectric loss tan ␦ and ac conductivity ac were studied as a function of frequency and composition and the behavior has been explained on the basis of Maxwell-Wagner interfacial model. All the dielectric parameters were found to decrease with the increase in doping concentration. Moreover, it has been observed that the dielectric loss approaches to zero in case of high dopant concentration ͑9%, 15%͒ at high frequencies.

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AC Conducitivity in Bismuth-Substituted Barium Hexaferrites

Cited by 15 publications

References 14 publications

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural and spectroscopic analysis of wurtzite (ZnO)1−x(Sb2O3)x composite semiconductor

Investigation of electrical properties of Mn doped tin oxide nanoparticles using impedance spectroscopy

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AC Conducitivity in Bismuth-Substituted Barium Hexaferrites

Cited by 15 publications

References 14 publications

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

Structural and spectroscopic analysis of wurtzite (ZnO)1−x(Sb2O3)x composite semiconductor

Investigation of electrical properties of Mn doped tin oxide nanoparticles using impedance spectroscopy

Contact Info

Product

Resources

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Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics