Glass transition temperature and conductivity in Li2O and Na2O doped borophosphate glasses

Ashwajeet, J. S.; Sankarappa, T.; Ramanna, Raja; Sujatha, T.; Awasthi, A. M.

doi:10.1063/1.4929175

Cited by 4 publications

(7 citation statements)

References 29 publications

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“…Positive variation of conductivity with temperature is observed revealing semiconducting type of behavior of the glasses. This is in agreement with results on various TMI doped glasses [27]. Conduction in these glasses can be caused by the hopping of polarons between Co 2+ and Co 3+ states.…”

Section: Conductivitysupporting

confidence: 92%

“…By applying the Archimedes principle, density (ρ) of the glasses has been measured using the VIBBRA make HT analytical balance of precession 0.01mg and Xylene as an immersion liquid [20]. The molar volume, Vm = M/ρ was determined as [27], M = (0.25) M(P2O5) + (0.5-x) M(TeO2) + (0.1) M(ZnO) + (0.1) M(Na2O) + (x) M(CoO)…”

Section: Characterizationmentioning

confidence: 99%

“…Thermally activated small polaron hopping (SPH) is considered to be the major conduction mechanism responsible for increase of electrical conductivity with temperature [37]. The Mott's SPH model expresses conductivity as [4,27].…”

Section: Conductivitymentioning

confidence: 99%

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Electrical and gamma ray shielding properties of phospho-tellurite glasses doped with alkali and transition metal oxides

Pallavi,

Sankarappa,

Amarkumar

et al. 2023

J. Phys.: Conf. Ser.

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This article presents investigated results on physical, electrical and gamma radiation shielding properties of glasses of composition, (P2O5)0.25-(TeO2)0.5-x-(Na2O)0.1- (ZnO)0.15-(CoO)x (x= 0.10, 0.15, 0.20, 0.25, 030 and 0.35) were synthesized by melt quenching procedure. After confirming non-crystallinity, density was measured and found it to be decreased with increase of CoO concentration in the range 4.0370 gm/cm3 - 3.5673 gm/cm3. Molar volume, mean distance between TMIs, small polaron radius, oxygen packing density and field strength were estimated. Conductivity was measured in the temperature range 303K -663K. High temperature conductivity is found to be varied as per Mott’s (SPH) model. High temperature activation energy is found to be increased with CoO content. Low temperature conductivity variation has been analyzed using Mott’s (VRH) model. Gamma ray shielding parameters were evaluated using Phy-X/PSD software for the energy range 0.005 MeV-15 MeV. The mass and linear attenuation coefficients were found to decrease with CoO content and photon energy. Half and tenth value layers increased with increase of mole fractions of CoO. All the observed shielding parameters are superior to those reported previously for other glasses. The glass with x=0.10 is best suited for the utility of gamma shielding at low energy.

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Section: Conductivitysupporting

confidence: 92%

Section: Characterizationmentioning

confidence: 99%

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Electrical and gamma ray shielding properties of phospho-tellurite glasses doped with alkali and transition metal oxides

Pallavi,

Sankarappa,

Amarkumar

et al. 2023

J. Phys.: Conf. Ser.

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“…Error on the measured conductivity was within 5%. Detailed procedure of conductivity measurements can be found in reference [15]. The well polished glasses were subjected to UV absorption measurements in a Jasco Spectrophotometer (Model name V-770) in the wavelength range of 200-800 nm.…”

Section: Methodsmentioning

confidence: 99%

“…The other physical parameters connected to density have been calculated. For example, transition metal ion density, N = 2[{ρ(mCoO + mZnO) / (MCoO + MZnO)}NA] [15], Where 𝑚 N 2 O is the Na2O concentration and 𝑀 Na 2 O is the molecular weight of the Na2O and NA is the Avagadro number, Field strength (F)= Z/(rp) 2 [18], where Z is the atomic weight of sodium. The obtained values of these parameters are listed in table 1.…”

Section: Density (ρ) and Molar Volume (Vm)mentioning

confidence: 99%

Electronic and optical properties of Na₂O doped P₂O₅-TeO_2⁻CoO-ZnO glasses

Pallavi,

Sankarappa,

Amarkumar

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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The phospho-tellurite glasses, (P2O5)0.25-(TeO2)0.5-x-(CoO)0.1-(ZnO)0.15-(Na2O)x ; x = 0.15, 0.20, 0.25, 0.30 and 0.35 were prepared by melt quenching and their non-crystalline nature confirmed through XRD. Density is found decreased and molar volume increased with increase of Na2O concentration and they behaved opposite to each other. The physical parameters such as transition metal ion density, mean distance between TMIs, small polaron radius, oxygen packing density and field strength were estimated. DC conductivity was measured by following two probe method in the temperature range 303K – 633K. High temperature conductivity is explained by Mott’s small polaron hopping (SPH) model and low temperature conductivity by Mott’s VRH model. Both conductivity and activation energy are found to be increasing with Na2O content. Density of states at Fermi level are found to be of the order of 1021 to 1024 eV−1 cm−3. UV-Vis spectra were recorded for the wavelength range 200-800 nm. Optical band gap (direct and indirect) except for x=0.20 is found increased, urbach energy and refractive indexes are found decreased with Na2O concentration. Various optical parameters such as molar polarizibility, metallization criterion, reflection loss, electronic polarizability, optical transmission coefficient, dielectric constant and optical dielectric constant have been determined.

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Investigation of the relationship between morphology-electrical transport phenomena in iron-doped quaternary glass nanocomposite

Mondal,

Dey,

Bhattacharya

et al. 2024

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Glass transition temperature and conductivity in Li2O and Na2O doped borophosphate glasses

Cited by 4 publications

References 29 publications

Electrical and gamma ray shielding properties of phospho-tellurite glasses doped with alkali and transition metal oxides

Electrical and gamma ray shielding properties of phospho-tellurite glasses doped with alkali and transition metal oxides

Electronic and optical properties of Na₂O doped P₂O₅-TeO_2⁻CoO-ZnO glasses

Investigation of the relationship between morphology-electrical transport phenomena in iron-doped quaternary glass nanocomposite

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Glass transition temperature and conductivity in Li2O and Na2O doped borophosphate glasses

Cited by 4 publications

References 29 publications

Electrical and gamma ray shielding properties of phospho-tellurite glasses doped with alkali and transition metal oxides

Electrical and gamma ray shielding properties of phospho-tellurite glasses doped with alkali and transition metal oxides

Electronic and optical properties of Na2O doped P2O5-TeO2− CoO-ZnO glasses

Investigation of the relationship between morphology-electrical transport phenomena in iron-doped quaternary glass nanocomposite

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Electronic and optical properties of Na₂O doped P₂O₅-TeO_2⁻CoO-ZnO glasses