Effect of substituting iron on structural, thermal and dielectric properties of lithium borate glasses

Dalal, Seema; Khasa, Satish; Dahiya, Manjeet S.; Agarwal, Ashish; Yadav, Arti; Seth, V. P.; Dahiya, Sunita

doi:10.1016/j.materresbull.2015.05.017

Cited by 48 publications

(4 citation statements)

References 36 publications

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“…The conductivity increases with low rate up to 70°C and then the rate tends to be much higher. The sample x = 5 has the lowest values of conductivity that attributed previously to the blocking effect of Fe 2 O 3 on flow of charge carriers [46]. The activation plot of the two trends for the samples x = 0-5 and of the two samples of higher Fe 2 O 3 ratios (7.5 and 10 wt %) follows an Arrhenius relation which reads [47,48]…”

Section: Dielectric and Electrical And Investigationsmentioning

confidence: 85%

Characterization of zinc lead-borate glasses doped with Fe3+ ions: optical, dielectric, and ac-conductivity investigations

Abouhaswa

Rammah

Turky

2020

J Mater Sci: Mater Electron

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The optical, dielectric response, and ac-conductivity properties for six glasses of zinc lead-borate doped with different contents of Fe 3? (Fe 2 O 3 = 0 to 10 wt%) have been investigated. UV-Vis spectra in 190-1100 nm wavelength have been carried out. Band gaps for optical energy (E Optical ), Urbach's energy (E U ), index of refraction (n), steepness parameter (S), energy dispersion parameter of refractive index (E d ), single-oscillator energy (E o ), the dispersion refractive index (n o ), minimum reflectance wavelength (k o ), and oscillator strength (S o ) were evaluated. Results reveal that the indirect energy gap varies from 2.57 to 1.01 eV, while the direct energy gap takes values from 2.80 to 1.45 eV. The E U values change from 0.232 to 0.966 eV for glasses with Fe 2 O 3 = 0 and 10 wt%, respectively. Also, S and k o decrease with the enhancement of Fe 2 O 3 content. The dielectric response and ac-conductivity of the prepared glasses were investigated by broadband dielectric spectroscopy, BDS, in the frequency range from 0.1 Hz to 10 MHz and at temperatures ranging between 300 and 430 K. Two trends of activation plot have been observed in the conductivity of the samples with low content of Fe 2 O 3 . Although these samples show a perfect insulation features, they obey an anomalous behavior at higher temperatures. Therefore, the investigated glasses can be applied in several optical and optoelectronic devices.

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Section: Dielectric and Electrical And Investigationsmentioning

confidence: 85%

Characterization of zinc lead-borate glasses doped with Fe3+ ions: optical, dielectric, and ac-conductivity investigations

Abouhaswa

Rammah

Turky

2020

J Mater Sci: Mater Electron

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“…Several IR absorption bands along with some shoulders can be observed which may be assigned to their respective structural vibrations. As per the literature, the basic building units of borate glasses are BO 3 tetrahedra whereas those of phosphate glasses are PO 4 tetrahedra connected through covalent bonding with oxygen [25,30]. The structure of borate and phosphate glasses can be divided into three regions.…”

Section: Ftirmentioning

confidence: 98%

“…The density of glass is strongly influenced by any change in the coordination number, crosslink density, geometrical configuration and dimensions of interstitial spaces [23,24]. Furthermore, in order to obtain a better measure of compactness or expansion of the glass network structure, molar volume (V m ) is often calculated using the relation [25]: while that of molar volume decreases from 37.7 to 34.6 cc mol −1 . The increase in the density can be governed by two factors: firstly, the molecular weight of Ca ions is more than Na ions.…”

Section: Characterizationmentioning

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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“…ions and the manganese ions are virtually immobile within the time duration of hopping process of Li ? ions [20]. The Li ?…”

Section: Dielectric Studiesmentioning

confidence: 99%

The effects of Ba2+ addition in the LiCO3–Mn2O3–B2O3 glass structure on electro-chemical and physical characterizations

Vinothkumar

Dhavamurthy

Mohapatra

et al. 2021

J Mater Sci: Mater Electron

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Lithium Manganese Barium Borate glass (LMBB) was prepared using a conventional melt quenching technique. Optical absorption of the prepared glass sample was investigated over a wavelength range of 200 to 1200 nm, with two absorption peaks were found at 228 nm and 476 nm corresponding to the UV and visible region, respectively. A hardness indentation test was performed on the prepared glass to see how the Mn 3? , Li 2? and Ba 2? ions in the borate framework influence mechanical behaviour. The dielectric permittivity, dielectric loss and a.c. electrical conductivity of the glass sample were examined in the frequency range from 1 Hz to 1 MHz at 30 °C. With subsequent additions of Mn 2 O 3 , the dielectric constant observed to improve. The hysteresis loop was used to determine the retentivity and coercivity of magnetic behaviour using VSM analysis, and the result confirmed that the prepared glass has paramagnetic characteristics. The elemental analysis revealed a majority of barium, manganese and oxygen in the glass, with negligible percentage of carbon. The surface morphology of the glass was examined using a scanning electron microscope, which confirmed the amorphous nature of the specimen. The scanning electron microscopic analysis was utilized to inspect the surface morphology of the LMBB borate glass. The electrochemical property of the glass was investigated using cyclic voltammetry (CV). The specific capacitance of the glass was found to decrease from 85 to 58 Fg -1 as the current density increased with the scanning rate of 2 mV s -1 .

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Effect of substituting iron on structural, thermal and dielectric properties of lithium borate glasses

Cited by 48 publications

References 36 publications

Characterization of zinc lead-borate glasses doped with Fe3+ ions: optical, dielectric, and ac-conductivity investigations

Characterization of zinc lead-borate glasses doped with Fe3+ ions: optical, dielectric, and ac-conductivity investigations

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

The effects of Ba2+ addition in the LiCO3–Mn2O3–B2O3 glass structure on electro-chemical and physical characterizations

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