Electrical characterization of lithium bismuth borate glasses containing cobalt/vanadium ions

Yadav, Arti; Dahiya, Manjeet S.; Narwal, Pinki; Hooda, Ashima; Agarwal, Ashish; Khasa, Satish

doi:10.1016/j.ssi.2017.10.006

Cited by 57 publications

(16 citation statements)

References 74 publications

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“…Figure 4А shows the frequency dependence of the electronic component of conductivity obtained for the spectrum given in Figure B. The fact that such dependence exists is reported in literature a number of times . The presence of this frequency dependence of electronic conductivity is the reason that the spectra in Figure A differ.…”

Section: Resultsmentioning

confidence: 99%

“…The fact that such dependence exists is reported in literature a number of times. [30][31][32] The presence of this frequency dependence of electronic conductivity is the reason that the spectra in Figure 2A differ. The low-frequency region of impedance spectra determines the dc resistance of glass, which is equal to 930 Ωcm 2 using Pt electrodes ( Figure 2А).…”

Section: Frequency Dependence Of Electronic Conductivitymentioning

confidence: 94%

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Conductivity features of semiconducting tungsten‐phosphate glasses

2019

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Summary The ac conductivity of 70WO3–30P2O5 glass composition prepared by melt quenching was first studied in the temperature range 25°C to 350°C. The conductivity of the semiconducting glass is investigated with various electrodes (Pt and Ga‐Ag alloy). It is shown that the type of spectrum of cell impedance depends on the chosen electrodes. The influence of the samples geometry on the conduction is established. The influence of gas atmosphere (argon, oxygen, and air of different humidity) on electrical conductivity of tungsten‐phosphate glass on is studied for the first time. A mixed electronic‐ionic conductivity in the 70WO3–30P2O5 glass is found out. The transport numbers are shown as a function of temperature. Ionic and electronic contribution to the conduction is estimated. The electrical conductivity of glass undergoes changes from 8.6 × 10−8 (25°C) to 3.1 × 10−4 S/cm (300°C) in air.

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Section: Resultsmentioning

confidence: 99%

Section: Frequency Dependence Of Electronic Conductivitymentioning

confidence: 94%

Conductivity features of semiconducting tungsten‐phosphate glasses

2019

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“…Therefore, this transition of ac conductivity from the frequency independent region to the frequency dependent region signifies the onset of conductivity relaxation phenomena [62]. The dispersion in conductivity in the higher frequency region is analysed using Jonscher's power law [69], given by σ (ω) = σ (0) + Aω…”

Section: Electric Modulusmentioning

confidence: 99%

Compositional dependence of properties in calcium substituted sodium borophosphate glasses containing $${\hbox {VO}}^{2+}$$ VO 2 + ions

et al. 2019

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Synthesis of calcium-substituted sodium borophosphate glasses with compositions xCaO − (30 − x)Na 2 O − 35B 2 O 3 − 35P 2 O 5 (x = 0, 2, 5, 7 and 10 mol%, abbreviated as CNVx) containing additional 1.0 mol% of V 2 O 5 following a melt-quench method has been carried out. Different analytical techniques viz. wide angle X-ray diffraction (to confirm noncrystalline nature), ultraviolet-visible spectroscopy (for optical band gap analysis), infrared absorption spectroscopy (for structural analysis) and differential thermal analysis (to evaluate characteristic temperatures) were employed to characterize the synthesized compositions. The optical band gap is calculated for both indirect allowed and indirect forbidden transitions. The values of the band gap decrease with increasing concentration of CaO (from 5 to 10 mol%) at the cost of Na 2 O. The cut-off wavelength and Urbach's energy are determined from the optical absorption spectra and were related to the structural changes occurring in these glasses with an increase in CaO content. The results obtained from Fourier-transform infrared studies confirm that V 2 O 5 and CaO play the role of network modifier oxides. Also, the significant shifting in IR bands with an increase in CaO content in the glass matrix suggests the formation of a new boron-oxygen ring. From differential scanning calorimetry measurements it is observed that substitution leads to the increase in natural bond orbitals, high degree cross-linking and thus strengthens the glass network. Glass transition temperature (T g ) is found to increase from 483 to 522 • C. Electrical and dielectric properties are analysed using dc conductivity and impedance spectroscopy. Using impedance spectroscopy, different dielectric parameters i.e. dielectric loss (ε ), electrical modulus (M * ) and ac conductivity (σ ac ) etc. are evaluated as a function of frequency, temperature and composition. The frequency dependence of impedance exhibits the non-Debye relaxation behaviour and the total conductivity obeys Jonscher's power law.

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“…The conductivity is almost frequency independent at low frequency region (plateau region) and corresponds to the DC conductivity (σ dc ) of the samples 40 . At the same time, the conductivity is dependent on frequency (σ ac ) at higher frequency region (dispersion region) and increases with increasing frequency 6,15,39,40 . The plateau region signifies the randomness of ionic diffusion which is due to the long-range order transport and appreciable diffusion of mobile ions in response to the applied ac field while the dispersion region signifies the conductivity relaxation phenomena in present samples 6,7,15,40,41 .…”

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confidence: 99%

“…Conducting studies. It is a well-known fact that hopping mechanism and band conduction are responsible for the electrical conduction in these types of materials 6,39 . The frequency dependent conductivity, σ ac of the samples is determined using the following relation 6,39 .…”

mentioning

confidence: 99%