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Objectives: Investigation of electrical transport properties of glass system in the composition (P2O5)0.65−x(B2O3)0.1 (ZnO)0.25 (Li2O)x where x=0.10, 0.15, 0.20, 0.25, 0.30, 0.35 and 0.40 and establish the conduction mechanisms. Methods: Glasses were synthesized using the standard melt quenching technique at 1473K. The samples were confirmed to be...
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... per the Eqn. (2) the VRH model plots have been drawn and best linear fits within the limit of ± (0.2-0.5%) of error to slopes are shown in Figure 5. ...
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Citations
... So, the present samples can be considered as glass-nanocomposites. The nano-crystallites were reported previously for alkali oxides doped zinc-boro-phosphate glasses (12) . ...
Objectives: To synthesise a unique set of borosilicate glasses of composition, xLi 2 O + 0.15SiO 2 + 0.45B 2 O 3 + 0.05ZnO + (0.35-x) WO 3 ; (0.25 ≤ x ≤ 0.34) and to investigate conduction mechanisms. Methods: Glasses were synthesized by melt quenching technique. From the XRD spectra samples were conformed to be non-crystalline in nature. Density has been measured by following Archimedes principle and is found to decrease with Li 2 O mole fractions in the range 2.900 gm/cm 3-2.495 gm/cm 3. DC-conductivity was measured for the temperature range 303K-525 K using two probe technique. Findings: It was found that these glasses behave like semiconductors in terms conductivity variation with temperature. Conductivity decreased with Li 2 O content up to 0.33 mole fractions and increases for higher mole fractions. High temperature conductivity variation i.e., above Θ D /2 (Θ D = Debye's temperature) is found to follow the Mott's small polaron hopping (SPH) model. Activation energy for conduction above Θ D /2 is found to be in the range 0.282 eV-0.702 eV. Decrease of conductivity and activation energy with increase of Li 2 O content has been explained in terms of dynamic nature of network and formation of cation-polaron neutral entities. The conductivity below Θ D /2 has been found to follow Mott's variable range hopping (VRH) models. The density of states at Fermi level derived from Mott's VRH are found to be of the order of 10 23 eV-1 cm-3 which are in close agreement with reported ranges for transition metal oxides doped glasses. Novelty: A unique set of mixed conducting borosilicate glasses have been prepared and investigated thoroughly for conduction mechanisms.
... Addition of Na 2 O modifies the borate network and leads to the formation of some Non Bridging Oxygens (NBOs) with increasing alkali content over 30 mol. %, thereby leading to enhanced ionic conductivity. 4,25 Therefore, in the present communication, broadband dielectric spectroscopy has been employed to understand the electric transport in Na 2 O modified zinc borate glasses for electrode materials. ...
The electrical conductivity of Na2O substituted zinc borate glasses has been studied in the frequency range of 10 mHz to 1 MHz and in the temperature range from 313 to 573 K. The conduction mechanism has been ascertained using the values of the frequency exponent (s) extracted from the fitting of experimental data of the real part of electric conductivity in light of the Almond–West equation. Depending on the glass composition, the ac conduction in the glasses happened via correlated barrier hopping and non-overlapping small polaron tunneling conduction models. The electric modulus studies support the assertion of composition dependent conduction mechanisms. Furthermore, electronic conduction and ionic conduction have been studied from impedance investigations. Equivalent circuit models were used to fit the Nyquist and Bode plots of each sample at the temperatures under consideration. It has been found that the activation energy values calculated from conductivity, electric modulus, and impedance measurements are more or less the same.
... The details of the preparation of glasses have been described in references (15,16) . Powder XRD studies were carried out for the confirmation of non-crystallinity nature of the prepared glasses. ...
ABSTRACT Two different series of borophosphate glasses doped with Li2O have been synthesized by a novel melt quenching technique in a high temperature furnace. The amorphous nature of the samples has been confirmed by X-ray diffraction studies. The room temperature density has been measured and molar volume determined. DC conductivity has been measured by two probe method over a wide range of temperature. Conductivity data has been analyzed by using Mott’s small polaron hopping model. The activation energy for conduction was determined. The low temperature data has been analyzed by Mott’s variable range hopping model and determined the density of states at Fermi level. Activation energy and density of states obtained were interpreted in terms of composition. Dielectric measurements as a function of frequency and temperature have been measured in a precision Impedance Analyzer interfaced with data acquisition computer system. The dielectric constant and dielectric loss data was analyzed in terms frequency, temperature, and composition. AC conductivity has been determined using dielectric properties and analyzed in terms of frequency, temperature, and composition. The activation energy for ac conduction for different frequencies were determined. AC conductivity was fit to Jonscher’s universal power law, and the frequency exponent values were determined. Obtained frequency exponent indicated its temperature dependance.
