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

Jakhati, Sangamesh; Nadavalumane, Nagaraja; Ashwajeet, J. S.

doi:10.4236/njgc.2022.121001

NJGC

2022

DOI: 10.4236/njgc.2022.121001

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

Sangamesh Jakhati¹,

Nagaraja Nadavalumane²,

J. S. Ashwajeet³

Abstract: 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 temperat… Show more

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Mixed conduction in iodovanadate glass-nanocomposites: DC conductivity, hopping frequency, and frequency response curves

Poddar,

Roy,

Ali

et al. 2024

Ionics

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Here, the system of amorphous semiconducting glassy system, xAgI -(1-x) (0.1CdO -0.3 V2O5 -0.4 P2O5 -0.2ZnO) with x = 0, 0.05, 0.1, 0.2, 0.3, 0.4has been developed. The gradual change in the size of various nanocrystallites such as VO2 , Zn2V2O7, V6O13, ZnV3O8 and P and the development of new phases of their combinations have been pronounced due to a gradual increase in AgI content. This may lead to the possible structural changes of the system under investigation. V-O-V vibration at lower energy may be responsible for weakening the covalent bond, which may be responsible for releasing vanadium ion to contribute more electron/ polaron. Correlated barrier hopping (CBH) model has been found to appropriate to predict the hopping conduction paths of charge carriers (or polarons) in pairs via current transfer between localized sites at the Fermi level. By incorporation of more and more AgI content in the composition, more bridging oxygen is expected to be formed in the composition and a strong covalent bonding between Ag + and O -2 may play dominating role for Ag + transport over polaron hopping. Double activation energy corresponding to DC conductivity in a wide range of temperature may be considered as the signature of mixed conduction process in the present system.Estimated values of frequency exponent (n) may be highlighted to validate this mixed conduction process. Percolation type of motion of polaron may be predicted from the higher values of n for the as-prepared samples with higher 2 AgIcontent. Similarly, three dimensional Ag + motion may be the dominating charge carriers for the samples with higher AgI content as evident from the moderate values of n.A schematic conduction model has been proposed to explain the nature of electrical conductivity in the present system.

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Mixed conduction in iodovanadate glass-nanocomposites: DC conductivity, hopping frequency, and frequency response curves

Poddar,

Roy,

Ali

et al. 2024

Ionics

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Bi-polaron hopping process of some MoO3 doped glassy system: Efors-Shkolvshkii gap in the unoccupied states

Halder

Ali

Bhattacharya

2023

Journal of Non-Crystalline Solids

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Chemical Durability, Properties and Structural Approach of the Glass Series xFe2O3-(45-x) PbO-55P2O5 (with 0 ≤ x ≤ 20; mol%)

Makhlouk¹,

Chabbou²,

Er-Rouissi³

et al. 2023

NJGC

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The synthesis for glasses series xFe 2 O 3 -(45-x)PbO-55P 2 O 5 , (with 0 ≤ x ≤ 20; mol%) carried out in a temperature (1050 ± 10)˚C, leads to obtaining transparent glasses, brown in color and with a non-hygroscopic appearance. The study of glasses dissolution rate, immersed in distilled water at 90˚C for 24 days, indicates a considerable chemical durability. The increase in the Fe 2 O 3 content in the vitreous network to the detriment of PbO is a favorable factor for the chemical durability improvement. Different techniques have been used such as X-ray diffraction, infrared spectroscopy, DSC, SEM and density for the study of these glasses. These techniques have led to establish correlations between chemical and structural properties. Thus the results obtained confirmed the creation of P-O-M bonds (M = Pb, Fe) with a strongly covalent nature to the detriment of the hydrated P-O-P bonds and led to the formation, mainly, of pyrophosphate groups. The low melting point of Pb-O makes it possible to play an important role, at the same time, on the viscosity, on the equilibrium between the vitreous bath and the crystallites formed. The dissolution rate obtained is 100 times smaller than that of silicate glasses used as an alternative form for the vitrification of radioactive waste.

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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

Cited by 3 publications

References 48 publications

Mixed conduction in iodovanadate glass-nanocomposites: DC conductivity, hopping frequency, and frequency response curves

Mixed conduction in iodovanadate glass-nanocomposites: DC conductivity, hopping frequency, and frequency response curves

Bi-polaron hopping process of some MoO3 doped glassy system: Efors-Shkolvshkii gap in the unoccupied states

Chemical Durability, Properties and Structural Approach of the Glass Series xFe<sub>2</sub>O<sub>3</sub>-(45-x) PbO-55P<sub>2</sub>O<sub>5</sub> (with 0 ≤ x ≤ 20; mol%)

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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

Cited by 3 publications

References 48 publications

Mixed conduction in iodovanadate glass-nanocomposites: DC conductivity, hopping frequency, and frequency response curves

Mixed conduction in iodovanadate glass-nanocomposites: DC conductivity, hopping frequency, and frequency response curves

Bi-polaron hopping process of some MoO3 doped glassy system: Efors-Shkolvshkii gap in the unoccupied states

Chemical Durability, Properties and Structural Approach of the Glass Series xFe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-(45-x) PbO-55P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; (with 0 ≤ x ≤ 20; mol%)

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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

Chemical Durability, Properties and Structural Approach of the Glass Series xFe<sub>2</sub>O<sub>3</sub>-(45-x) PbO-55P<sub>2</sub>O<sub>5</sub> (with 0 ≤ x ≤ 20; mol%)