Structural and electrical properties of Bi(Mg0.5Ti0.5)O3 ceramic

Purohit, Varsa; Padhee, R.; Choudhary, R. N. P.

doi:10.1007/s10854-017-8487-9

Cited by 29 publications

(6 citation statements)

References 34 publications

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“…Measuring of the impedance is a powerful tool for characterizing the electrical properties of polymers and to explore the kinetics of charges, the type of relaxation mechanism, the contribution of grain boundaries, and the electrode interface effect in the composites under investigations 75,76 . The nature of semicircular curve in Z / (real part of impedance) vs Z // (imaginary part of impedance) plot describes these effects with an equivalent circuit for each one.…”

Section: Resultsmentioning

confidence: 99%

“…The Nquist plot for PVA doped with different concentrations (A) 0, (B) 5, (C) 10, (D) 20, and (E) 25 wt% of NaI on PVA polymer charges, the type of relaxation mechanism, the contribution of grain boundaries, and the electrode interface effect in the composites under investigations. 75,76 The nature of semicircular curve in Z / (real part of impedance) vs Z // (imaginary part of impedance) plot describes these effects with an equivalent circuit for each one. The complex impedance is given as Z * = Z / + iZ // , where Z / = Z * cos ϕ, Z // =Z * sin ϕ, and ϕ is the phase angle.…”

Section: Impedance Analysismentioning

confidence: 99%

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Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

Hmamm

Zedan

Hamed

et al. 2020

Polymers for Advanced Techs

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Positron annihilation lifetime (PAL), AC conductivity, and impedance spectroscopy have been applied for the investigation of polyvinyl alcohol (PVA) doped with different concentrations of NaI in the range from zero to 25 wt%. Wide‐angle x‐ray diffraction measurements reveal that the addition of NaI to the PVA structure leads to a decrease in the crystallinity of the sample. The free volume size obtained from PAL measurements increases with the increase of the NaI concentration on PVA. NaI acts as an inhibitor of positronium formation on the doped polymer with inhibition constant of 0.028 (Mol%)−1. The ionic conductivity of the investigated sample was found to be correlated with the free volume size, which indicates the major role of free volume in the conduction mechanism. The AC conductivity of the prepared samples is measured at room temperature in the frequency range from 50 Hz to 5 MHz. The calculated values of frequency exponent s indicate the hopping mechanism in ionic conductivity. Impedance spectroscopy of PVA doped with different concentrations of NaI was studied. The appeared semi‐circle, in the Nyquist plot, denotes the bulk influence of PVA with different concentrations of NaI. This has been attributed to the parallel connection of bulk resistance and bulk capacitance. Also, the semi‐circle radius of Cole‐Cole plots was found to decrease with the increase of the concentration ratio (wt%) of NaI. So, the increase of the conductivity of PVA with the increase of NaI contents has been investigated.

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Section: Resultsmentioning

confidence: 99%

Section: Impedance Analysismentioning

confidence: 99%

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

Hmamm

Zedan

Hamed

et al. 2020

Polymers for Advanced Techs

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“…The impedance data are used to analyze the relaxation process of the materials. [ 35 ] Figure 5 a shows the rate of change of Z ′ with frequency reduces with increasing frequency, and seems to merge beyond 30–40 kHz. Although for pure BKT, Z ′ increases with an increase in temperature for all the frequencies, for Mn‐doped BKT sample with x = 0.05, Z′ increases with increase in temperature up to 350 °C and then decreases and for samples with x = 0.10 and 0.15, Z′ decreases with increase in temperature exhibiting the nature of negative temperature coefficient of resistance (NTCR) in the material.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Manganese Substitution on Structural and Electrical Characteristics of Bi_0.5K_0.5TiO₃ Ceramics

Pradhani

Mahapatra

Choudhary

2020

Physica Status Solidi (b)

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Manganese (Mn)‐modified bismuth potassium titanate, i.e., Bi0.5K0.5Ti1−xMnxO3 (x = 0, 0.05, 0.10, and 0.15), compounds are fabricated by a mixed‐oxide method. The Rietveld analyses of X‐ray diffraction data and the Raman spectroscopy support the formation of the compounds in the tetragonal phase. The crystallite and the grain size are found to be higher for compounds having more oxygen vacancies. With increase in Mn concentration, the bulk resistance decreases drastically and the energy bandgap reduces. The dielectric constant increases substantially with substitution of Mn. The analysis of complex impedance spectroscopy confirms the non‐Debye‐type relaxation mechanisms in the compounds. Based on the activation energy of the conduction process, analysis of leakage current, and energy‐dispersive X‐ray spectroscopy (EDX) data, the ionization of oxygen vacancy and the hopping of trapped electrons between multivalent Ti and Mn ions in electrical properties of the compounds are discussed. The compounds follow the correlated barrier hopping conduction mechanism. While the leakage current in Bi0.5K0.5TiO3 fits the Poole–Frenkel model, that in Mn‐substituted samples exhibits Ohmic conduction mechanism.

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“…The experimental measurements have been done in a wide range of frequencies (1 kHz-1 MHz) and temperature (25°C-400°C). The analysis of the impedance data, = ¢ - Z Z jZ , is helpful in understanding the kinetics of bound and mobile charges in the bulk and interfacial parts and also the relaxation mechanism present in the system [24]. In figure 4, for all the composition of x, Z′ exhibits the normal behavior, i.e.…”

Section: Impedance Spectroscopymentioning

confidence: 99%

“…Cerium being a rare-earth element in the lanthanide series exists in the free metal or oxide form, and can exchange oxidation states between the cereous-cerium (III) and ceric-cerium (IV). CeO 2 is a semiconductor with moderate band gap (3-3.6 eV), high dielectric constant (23)(24)(25)(26) and refractive index (2.2-2.8) [7]. As reported, it has multiple applications, such as electrolyte material for solid oxide fuel cells, high-storage capacitor devices, gas sensing, polishing materials, ultraviolet absorbents and optical devices [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi_0.5Na_0.5)TiO₃ ceramics

2018

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The composite ceramics, Bi 0.5 Na 0.5 TiO 3 −xCeO 2 (x=0, 0.05, 0.10, 0.15) with a general chemical composition (Bi 0.5 Na 0.5 )(Ti 1−x Ce x )O 3 were fabricated by using a solid state reaction ceramic technology. The detailed structural analysis using x-ray diffraction data exhibits the formation of composites of Bi 0.5 Na 0.5 TiO 3 (BNT) and CeO 2 in rhombohedral and cubic phase respectively. The Fourier transform infrared spectroscopy spectrums confirm the formation of compounds through the occurrence of characteristic peak corresponding to Ce-O, Ti-O and Bi-O bonds. With the increase in CeO 2 content in the composite, the optical band gap decreases from 2.97 eV (for x=0) to 2.45 eV for the sample (for x=0.15). The impedance analysis confirms the contribution of grains only to the polarization and conduction processes. Two phase change corresponding to ferroelectric to antiferroelectric, and then to the paraelectric is observed at around 350°C and 470°C respectively. The addition of CeO 2 in BNT significantly enhances the dielectric and ferroelectric properties with the decrease in loss tangent.

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Structural and electrical properties of Bi(Mg0.5Ti0.5)O3 ceramic

Cited by 29 publications

References 34 publications

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

Investigation of Manganese Substitution on Structural and Electrical Characteristics of Bi_0.5K_0.5TiO₃ Ceramics

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi_0.5Na_0.5)TiO₃ ceramics

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Structural and electrical properties of Bi(Mg0.5Ti0.5)O3 ceramic

Cited by 29 publications

References 34 publications

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

Investigation of Manganese Substitution on Structural and Electrical Characteristics of Bi0.5K0.5TiO3 Ceramics

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi0.5Na0.5)TiO3 ceramics

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Product

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Investigation of Manganese Substitution on Structural and Electrical Characteristics of Bi_0.5K_0.5TiO₃ Ceramics

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi_0.5Na_0.5)TiO₃ ceramics