Mixed alkali effect and optical properties of Ni2+ doped 20ZnO+xLi2O+(30−x)Na2O+50B2O3 glasses

“…The low-frequency bands in the FTIR spectra of investigated glasses can be attributed to vibration of metal cations present in the glass [10]. A strong absorption peak around 454 cm -1 is assigned to the characteristic vibration of lithium cation [11]. Absorption bands in the region 400-550 cm -1 are due to ZnO tetrahedron in glasses [12].…”

Section: Resultsmentioning

confidence: 99%

Structural, Dielectric and AC Conductivity Behavior of Multicomponent TeO2-ZnO-Li2O-Na2O-B2O3 Glasses

Shruthi¹,

Madhu²

2021

J. Nano- Electron. Phys.

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Multicomponent glasses of the TeO2-ZnO-Li2O-Na2O-B2O3 (TZLNB) system have been prepared by conventional melt quenching method. Synthesized glasses were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman and UV-Visible spectroscopic techniques. The amorphous nature of these glasses has been confirmed by their XRD pattern. In the present TZLNB glass, B2O3 is found to transform into a complex network, which involves a boroxol ring coupled with a fourfold-coordinated boron (BO4) due to non-bridging oxygens. The frequency dependences of dielectric constant (ε′), dielectric loss tangent (tanδ) and ac conductivity (ac) studies have been undertaken on the TZLNB glasses in the frequency range 50 Hz-5 MHz at room temperature. Dielectric properties such as dielectric constant and dielectric loss tangent are found to decrease with increasing frequency. Present TZLNB glasses are found to possess high dielectric constant and very low dielectric loss in the studied frequency range. Further, ac conductivity is found to increase with increasing frequency due to an increased density of mobile ions for conduction. Present TZLNB glasses possess excellent dielectric properties such as high dielectric constant and very low dielectric loss and thought to be the most promising dielectric material for the memory cell capacitors in dynamic random-access memory (DRAM) chips.

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“…Urbach energy (𝛥𝐸) was obtained from the reciprocal slope of the graph of absorption coefficient logarithm (𝑙𝑛𝛼), versus the photon energy (ℎ𝑣) [25][26] . The variation in optical band gap (𝐸 𝑔 ) are deduced using the following formulae [23][24] :…”

Section: Fig 3: Optical Absorption Spectra Of the Investigated Glassesmentioning

confidence: 99%

Influence of the addition of Two Transition Metal Ions to Sodium Zinc Borophosphate Glasses for Optical Applications

et al. 2021

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Effect of Co and Mo ions on the sodium zinc borophosphate glasses network was investigated. Both structural and optical properties were studied by X-ray diffraction, density, infrared spectroscopy and optical absorption. Only a broad halo was observed in the X-ray diffraction patterns indicating the non-crystalline nature of the prepared samples. Density and related parameters such as molar volume and average boron-boron separation showed that the glass network became more compact by increasing Mo oxide. Fourier Transform Infrared (FTIR) spectroscopy results showed that the free Co and Mo sample revealed the formation of structural building units of the borate and phosphate glasses. The addition of Co and Mo oxides cause variation in structural sites of the glass formers which appear as a small change in the FTIR spectra. The optical absorption spectra in the UV-Visible regions were used to study the optical d-d transitions of Co and Mo ions. Deconvolution of the absorption spectra gave multi-bands in the UV-Visible regions which, are related to the presence of various oxidation states of the two transition metal ions, cobalt and molybdenum, octahedral and tetrahedral of Co 2+ , octahedral of Co 3+ , Mo 3+ , and Mo 5+ . The calculated optical energy gap, Urbach energy and refractive index of all the prepared samples were found to be glass composition dependent.

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Mixed alkali effect and optical properties of Ni2+ doped 20ZnO+xLi2O+(30−x)Na2O+50B2O3 glasses

Cited by 29 publications

References 36 publications

Correlation between physical and structural properties of Co2+ doped mixed alkali zinc borate glasses

Correlation between physical and structural properties of Co2+ doped mixed alkali zinc borate glasses

Structural, Dielectric and AC Conductivity Behavior of Multicomponent TeO2-ZnO-Li2O-Na2O-B2O3 Glasses

Influence of the addition of Two Transition Metal Ions to Sodium Zinc Borophosphate Glasses for Optical Applications

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