Microstructure and Dielectric Properties of Barium-vanadate Glasses

Szreder, N.A.; Kosiorek, P.; Karczewski, Jakub; Gazda, Maria; Barczyński, R.J.

doi:10.1016/j.proeng.2014.12.489

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…As the temperature is lowered, multiphonon processes are replaced by a single optical phonon process and at the lowest temperatures the polaron hops with one or more acoustic phonons making up the difference between the sites [12]. This model was found to be in good agreement with the experimental data for many TMO glass systems and gives reasonable values for the phonon frequency, decay parameter, polaron hopping energy and disorder energy [14][15][16].…”

Section: Introductionmentioning

confidence: 72%

“…However, some models give more satisfactory network parameters and can better explain the variation of conductivity with temperature [12,13]. As the Mott theory seems to well-describe the conduction behavior of TMO-containing glasses at high temperatures ([ h/2, where h is Debye temperature) [9], in the low temperature region, the Schnakenberg model can better clarify the variation of activation energy with temperature observed in many glass systems [12,14]. Schnakenberg considered that an optical multiphonon assisted hopping process determines the D.C. (direct current) conductivity at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics

et al. 2022

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Electrical properties of beryllium-alumino-tellurite glasses and glass–ceramics doped with iron ions were studied using impedance spectroscopy. The conductivity was measured over a wide frequency range from 10 mHz to 1 MHz and the temperature range from 213 to 473 K. The D.C. conductivity values showed a correlation with the Fe-ion concentration and ratio of iron ions on different valence states in the samples. On the basis of Jonscher universal dielectric response the temperature dependence of conductivity parameters were determined and compared to theoretical models collected by Elliott. In glasses, the conduction process was found to be due to the overlap polaron tunneling while in glass–ceramics the quantum mechanical tunneling between semiconducting crystallites of iron oxides is proposed. The D.C. conductivity was found not to follow Arrhenius relation. The Schnakenberg model was used to analyze the conductivity behavior and the polaron hopping energy and disorder energy were estimated. Additionally, the correlation between alumina dissolution and basicity of the melts was observed.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics

et al. 2022

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“…It is usually stated that the dc conductivity increases when the glass structure becomes open [25], (due to an easier mobility of the charge carriers). However a relation between the molar volume and activation energy values are represented in Figure (6). From this Figure, it appears that the activation energy values show approximate linear decrease, and the decreasing rate differ from one glass to another.…”

Section: Volume- Mass-and Molar-magnetic Susceptibilitiesmentioning

confidence: 93%

“…The magnetic properties of glasses are of special interest, and therefore Gouy method was used here to measure the volume magnetic susceptibility (k) of the studied glasses, by using equation (6), 2 2/ k g m AH  (6) where g is the acceleration due to gravity, ∆m is the change in the mass with the square value of the applied magnetic field intensity (H 2 ) and A is the cross sectional area of the used tube, respectively.…”

Section: Volume- Mass-and Molar-magnetic Susceptibilitiesmentioning

confidence: 99%

“…Vanadium containing glasses have early attracted the attention of many workers, and hence many articles have been published dealing with the study of their structure and properties [1][2][3][4][5][6]. It is observed that special interest has been paid to the electronic transport properties of such glasses due to their interesting applications in the field of electronic devices [4][5][6][7][8]. It was found that vanadium ions occupy V 5+ , V 4+ and/or V 3+ in the network of various oxide glasses [7].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Halogen Ions on Physical Properties of Some Boro-Vanadate Glasses

2018

Al-Azhar Bulletin of Science

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Some sodium boro-vanadate glasses containing various halogen ions (chlorine, bromine or iodine) were prepared by melting at 1000 o C for 2hrs and annealed at 300 o C for 3hrs. These glasses were characterized by measuring the experimental densities, dc conductivities and volume-magnetic susceptibilities. Then the empirical densities, experimental and empirical molar volume values, electrical activation energies, mass-and molar-magnetic susceptibilities as well as the total mass attenuation coefficients of all glasses were calculated.It was found that, the activation energy decreased as the halogen content was increased which may be due to the increase in the mobility of sodium ions and the gradual formation of some terminal non-bridging halogens, in addition to the electron hopping process between different oxidation states of vanadium. It decreased also ongoing from chlorine to iodine that can be ascribed to the differences in ionic radii of halogen ions. Also, the decrease in activation energy may be due to the increase in the interstitial vacancies. This was confirmed by the density and the molar volume results.It was supposed that the increase in the paramagnetic character of the studied glasses with the increase of halogen content may be due to the formation of VXO 3 groups. Also, the magnetic properties were found to decrease as the ionic radius of the introduced halogen ions increased. This can be attributed to the increase in the internal vacancies through the network.Correlations were established between the experimental values of both the activation energy and molar susceptibility with the calculated molar volume values of the studied glasses.According to the results of the mass attenuation coefficients, it was found that, the sample contains 25 mol% NaI is the best one that can be used as -ray attenuator, but only at gamma-ray energies up to 356 keV.

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All-Solid-State Batteries Based on Glass-Ceramic Lithium Vanadate

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Saetova

2019

Solid Electrolytes for Advanced Applications

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Microstructure and Dielectric Properties of Barium-vanadate Glasses

Cited by 7 publications

References 15 publications

Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics

Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics

Influence of Halogen Ions on Physical Properties of Some Boro-Vanadate Glasses

All-Solid-State Batteries Based on Glass-Ceramic Lithium Vanadate

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