Impact of sodium oxide, sulfide, and fluoride-doped vanadium phosphate glasses on the thermoelectric power and electrical properties: structure analysis and conduction mechanism

El‐Desoky, M. M.; Wally, N. K.; Sheha, E.; Kamal, Babar

doi:10.1007/s10854-020-05115-7

Cited by 10 publications

(8 citation statements)

References 45 publications

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“…F N E varies from 10 26 eV −1 m −3 to 10 30 −1 m −3 and both are presented in Table 4, found to be in agreement with the several determined val-ues by Greave's VRH model for alkali and TM ion doped oxide glasses [16] [25]…”

Section: F N Esupporting

confidence: 73%

“…In 65P 2 O 5 -15BaO-5Al 2 O 3 -5ZnO-10Na 2 O glass network added by B 2 O 3 content, the hardness and flexural strength were found high up to 6 mol% boron content, which indicates the improvement in mechanical properties of glass by inclusion of boron [13]. The inclusion of alkali and TM ions in borophosphate glasses, increases the conductivity of the glass systems [14] [15] [16] [17]. The electrical conductivity in the single TM ion doped oxide glasses such as CuO, Fe 2 O 3 and V 2 O 5 is attributed to charge carrier hopping between lower and higher valency state of TM ion, for example, Cu + to Cu 2+ , Co 2+ to Co 3+ , V 4+ to V 5+ , and so on, and nobody were reported the "single transition effect" [18] [19] [20].…”

Section: Introductionmentioning

confidence: 99%

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Studies of Anomalies in Mixed Conduction of Na2O and V2O5 Doped Boro-Phosphate Glasses

Jakhati¹,

Nadavalumane²,

Ashwajeet³

2022

NJGC

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A set of borophosphate glasses doped with alkali and transition metal (TM) ions have been synthesized. The glasses were carried through; annealing, XRD, density, DC conductivity studies. Molar volume and density varied nonlinearly. High temperature activation energy is analysed taking into consideration of Mott's SPH model. The low temperature electrical conductivity was analysed by Mott and Greaves VRH. Several polaron hopping related parameters at high temperature region and density of states at low temperature region were computed. The high temperature DC activation energy measured by conductivity, calculated numerous pertained parameters varied nonlinearly with mole fraction of vanadium content. The Study exhibits DC electrical conduction is due to both alkali and transition metal ions and thus confirms the mixed conductivity. A crossover conduction mechanism from the ionic dominant region to polaronic predominant region has been also observed.Studies revealed the single transition effect at 0.4 mol fraction of V 2 O 5 content.

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Section: F N Esupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Studies of Anomalies in Mixed Conduction of Na2O and V2O5 Doped Boro-Phosphate Glasses

Jakhati¹,

Nadavalumane²,

Ashwajeet³

2022

NJGC

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“…In most glass samples, it was observed that the density and molar volume showed behaviors that were quite opposite to each other [ 43 , 44 ]. In contrast, a decrease in the density value, which was also accompanied by a decrease in the value of the molar volume, was noted by Kieldsen et al [ 45 ] in a series of MgO/CaO sodium aluminosilicate glass by substituting MgO for CaO, as well as by Samdani et al [ 46 ], who studied the mixed alkaline effect in double-alkaline borate glass from the MgO-BaO-B 2 O 3 -CuO system.…”

Section: Resultsmentioning

confidence: 99%

Structural and Optical Properties of Pure and Sulfur-Doped Silicate–Phosphate Glass

et al. 2021

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A series of silicate–phosphate glass materials from the SiO2-P2O5-K2O-MgO system (pure and doped with sulfur ions) were synthesized by melting raw material mixtures that contained activated carbon as a reducer. The bulk composition of glass was confirmed with X-ray fluorescence spectroscopy. The homogeneity of the glass was confirmed through elemental mapping at the microstructural level with scanning electron microscopy combined with an analysis of the microregions with energy-dispersive X-ray spectroscopy. The structural and optical properties of the glass were studied by using spectroscopic techniques. The infrared spectroscopy studies that were conducted showed that the addition of sulfur caused changes in the silicate–phosphate networks, as they became more polymerized, which was likely related to the accumulation of potassium near the sulfur ions. By using irradiation with an optical parametric oscillator (OPO) nanosecond laser system operating at the second harmonic wavelength, the glass samples emitted a wide spectrum of luminescence, peaking at about 700 nm when excited by UV light (210–280 nm). The influence of the glass composition and the laser-processing parameters on the emission characteristics is presented and discussed. This work also referred to the density, molar volume, and theoretical optical basicity of pure and sulfur-doped glass.

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“…In the non-adiabatic hopping process, the pre-exponential factor r 0 (in Eq. 8) is determined by [30]:…”

Section: Conductivity and Activation Energymentioning

confidence: 99%

“…where W H refers to the polaron hopping energy (W H = W P /2, W P is the binding energy), W D refers to the disorder energy, and is given by [30]:…”

Section: Conductivity and Activation Energymentioning

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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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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Impact of sodium oxide, sulfide, and fluoride-doped vanadium phosphate glasses on the thermoelectric power and electrical properties: structure analysis and conduction mechanism

Cited by 10 publications

References 45 publications

Studies of Anomalies in Mixed Conduction of Na<sub>2</sub>O and V<sub>2</sub>O<sub>5</sub> Doped Boro-Phosphate Glasses

Studies of Anomalies in Mixed Conduction of Na<sub>2</sub>O and V<sub>2</sub>O<sub>5</sub> Doped Boro-Phosphate Glasses

Structural and Optical Properties of Pure and Sulfur-Doped Silicate–Phosphate Glass

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

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Impact of sodium oxide, sulfide, and fluoride-doped vanadium phosphate glasses on the thermoelectric power and electrical properties: structure analysis and conduction mechanism

Cited by 10 publications

References 45 publications

Studies of Anomalies in Mixed Conduction of Na&lt;sub&gt;2&lt;/sub&gt;O and V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; Doped Boro-Phosphate Glasses

Studies of Anomalies in Mixed Conduction of Na&lt;sub&gt;2&lt;/sub&gt;O and V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; Doped Boro-Phosphate Glasses

Structural and Optical Properties of Pure and Sulfur-Doped Silicate–Phosphate Glass

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

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Studies of Anomalies in Mixed Conduction of Na<sub>2</sub>O and V<sub>2</sub>O<sub>5</sub> Doped Boro-Phosphate Glasses

Studies of Anomalies in Mixed Conduction of Na<sub>2</sub>O and V<sub>2</sub>O<sub>5</sub> Doped Boro-Phosphate Glasses