Structure, Seebeck coefficient and DC electrical conductivity of Bi2Mn4O10 prepared by mechanochemical method

Fareed, Shereef A.; Ibrahim, Makram; Hannora, Ahmed E.; El‐Desoky, M. M.

doi:10.1007/s10854-022-08426-z

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…The variation of lattice strain (e) and crystallite sizes (D) of the nanostructured BFPT samples is presented in Table 1. Therefore, the variation of the crystallite size may be ascribed to the change in phase with milling time over the agglomeration and diffusion processes, as reported previously in [19,20].…”

Section: X-ray Diffraction Analysis (Xrd)supporting

confidence: 61%

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Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

El‐Desoky

Gazouly

Hannor

et al. 2023

J Mater Sci: Mater Electron

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Nanostructured 0.52 Bi2O3–0.18 Fe2O3–0.30 PbTiO3 (BFPT) mol% sample was prepared via a high-energy planetary ball mill. To obtain nanostructured materials, the mixture was mechanically milled for 1, 2, 5, and 25 h. The heat treating process was applied to the milled BFPT sample at 673, 873, and 1073 K for 5 h. The amorphous natures of the as-milled and crystallized formed phases of the heat treated samples are examined using the X-ray diffraction (XRD) technique. HRTEM and XRD were used to confirm the amorphous nature and nanocrystallization of the milled and the heat treated BFPT samples, respectively. The effect of the heat-treatment temperature of BFPT samples on their dc electrical conductivity (σ), density (ρ), and oxygen molar volume (Vm) was studied. The results of the thermoelectric power indicate a p-type semiconducting behavior of the BFPT samples. The high temperature (above θD/2) dependent on conductivity was explicated by the small polaron hopping (SPH) model. While Greaves’ variable range hopping (VRH) model was studied at intermediate temperatures. The physical parameters determined from the best fits of these models were thought to be reasonable and consistent with the BFPT samples. The hopping carrier mobility was found to be the dominant factor for determining the conductivity in the BFPT samples. The electronic transport between Fe ions was primarily responsible for the conduction, which was shown to obey the adiabatic SPH.

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Section: X-ray Diffraction Analysis (Xrd)supporting

confidence: 61%

“…The r p values for the nanostructured BFPT are recorded in Table 4. The polaron hopping energy W H could also be calculated by the formula [19]:…”

Section: Small Polaron Hopping (Sph) Parametersmentioning

confidence: 99%

Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

El‐Desoky

Gazouly

Hannor

et al. 2023

J Mater Sci: Mater Electron

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“…As the condition of the localized for the conductive electrons is generally for μ < 0.01cm 2 V -1 s -1 [27], confirming the formation of small polaron in our samples. Also, the constant Nc ∼ 10 18 indicates that the conductivity of such samples is determined by hopping mobility [27,30].…”

Section: Resultsmentioning

confidence: 99%

Early stage nanocrystallization as a method of enhancement of electrical properties of lead/barium titanate doped vanadium borate glasses

Harby

Hannora

Ali

et al. 2023

Preprint

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Glass-ceramic nanocomposites (GCNs) of (10x) BaTiO3 (BT)-xPbTiO3 (PT) -60V2O5-30B2O3 with x= 0, 2.5, 5, 7.5 and 10 mol% were formed during heat treatment of conventional melt quenching glasses. X-ray diffraction was used to ensure glass and GCNs formation. Glasses and GCNs densities were measured by Archimedes principle. Fine polar clusters of lead titanate and/or barium titanate incorporation into vanadium borate glass matrix strongly depend on the composition. It was found out that the electrical conductivity of the initial glasses can be considerably improved by proper early stage of nanocrystallization at temperatures approaching the crystallization temperatures determined by DSC method. GCNs show massive increase in electrical conductivity (up to 6 orders of magnitude) as a function of BaTiO3 content. By increasing BaTiO3 content, the activation energy values have been found to increase. The enhancement in electrical conductivity of GCNs can be attributed to the increase in the crystalline phases in the glassy matrix which increases the concentrations of the V ion pairs.

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“…As the condition of the localized for the conductive electrons is generally for cm 2 V −1 s −1 27 , confirming the formation of small polaron in our samples. Also, the constant N c ~ 10 18 indicates that the conductivity of such samples is determined by hopping mobility 30 – 33 .…”

Section: Resultsmentioning

confidence: 99%

Early stage nanocrystallization as a method of enhancement of electrical properties of lead/barium titanate doped vanadium borate glasses

Harby

Hannora

Ali

et al. 2023

Sci Rep

Self Cite

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Glass–ceramic nanocomposites (GCNs) of (10 − x) BaTiO3 (BT)–xPbTiO3 (PT)–60V2O5–30B2O3 with x = 0, 2.5, 5, 7.5 and 10 mol% were formed during heat treatment of conventional melt quenching glasses. X-ray diffraction was used to ensure glass and GCNs formation. Glasses and GCNs densities were measured by Archimedes principle. Fine polar clusters of lead titanate and/or barium titanate incorporation into vanadium borate glass matrix strongly depend on the composition. It was found out that the electrical conductivity of the initial glasses can be considerably improved by proper early stage of nanocrystallization at temperatures approaching the crystallization temperatures determined by DSC method. GCNs show massive increase in electrical conductivity (up to 6 orders of magnitude) as a function of BaTiO3 content. By increasing BaTiO3 content, the activation energy values have been found to increase. The enhancement in electrical conductivity of GCNs can be attributed to the increase in the crystalline phases in the glassy matrix which increases the concentrations of the V ion pairs.

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Structure, Seebeck coefficient and DC electrical conductivity of Bi2Mn4O10 prepared by mechanochemical method

Cited by 6 publications

References 46 publications

Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

Adiabatic small polaron hopping conduction in nanostructured Bi2O3–Fe2O3–PbTiO3 prepared by high energy planetary ball mill

Early stage nanocrystallization as a method of enhancement of electrical properties of lead/barium titanate doped vanadium borate glasses

Early stage nanocrystallization as a method of enhancement of electrical properties of lead/barium titanate doped vanadium borate glasses

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