Physical and optical studies in mixed alkali borate glasses with three types of alkali ions

Samee, M.A.; Awasthi, A. M.; Shripathi, T.; Bale, Shashidhar; Srinivasu, Ch.; Rahman, Syed

doi:10.1016/j.jallcom.2010.12.039

Cited by 22 publications

(6 citation statements)

References 41 publications

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“…10 shows the variation of the reflection loss and molar polarizability as a function of K 2 O content, which exhibits the mixed alkali effect (MAE). The mixed alkali effect was also observed by other workers [16,17] in the physical properties and spectroscopic studies.…”

Section: Reflection Loss (R) Molar Refraction (R M ) and Molar Polarsupporting

confidence: 81%

Mixed alkali effect in the physical and optical properties of xK₂O-(25-x)Na₂O-12.5MgO-12.5BaO-50B₂O₃ glasses

Gadipelli

Ramesh

Kumar

et al. 2016

Journal of Taibah University for Science

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Borate glasses with the composition xK 2 O-(25-x)Na 2 O-12.5MgO-12.5BaO-50B 2 O 3 (x = 0, 5, 10, 15, 20 and 25 mol%) were prepared by the melt-quenching technique and were characterized using X-ray diffraction at room temperature. From the optical absorption spectra, the direct forbidden, direct allowed, indirect allowed, and indirect forbidden energy gaps; Urbach energy; refractive index (n); dielectric constant (ε); reflection loss (R); molar refraction (R m); and molar polarizability (α m) values of all of the glass samples were evaluated. R m , α m and Λ th increase with the increase of the K 2 O content. The values of R, ε and n increase up to x = 10 mol% and then decrease above x = 10 mol%, which may be due to the mixed alkali effect. The density and molar volume values show the opposite behaviour and vary nonlinearly with the K 2 O content, which manifests the mixed alkali effect in the present glass system. The infrared (IR) spectra of the borate glasses reveal the existence of 3-and 4-coordinated boron atoms. The specific vibrations of the Na-O, K-O, Mg-O, and Ba-O bonds were observed in an IR study.

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Section: Reflection Loss (R) Molar Refraction (R M ) and Molar Polarsupporting

confidence: 81%

Mixed alkali effect in the physical and optical properties of xK₂O-(25-x)Na₂O-12.5MgO-12.5BaO-50B₂O₃ glasses

Gadipelli

Ramesh

Kumar

et al. 2016

Journal of Taibah University for Science

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“…This result indicates that the glass structure becomes loosely packed. Similar observations were found in mixed alkali borate glasses [56,57]. The glass transition temperature of borate glasses is linked with the atomic arrangements present in the glass system.…”

Section: Physical Parameterssupporting

confidence: 81%

Mixed alkali effect in physical and optical properties of Li2O–Na2O–WO3–B2O3 glasses

Edukondalu

Purnima

Srinivasy

et al. 2012

Journal of Non-Crystalline Solids

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“…basicity of the oxide medium Λ and the optical energy based interaction parameter A(E o ) [17,18] of the present glasses were determined using the formulae presented in our previous paper [7]. The values of these parameters are presented in table 1.…”

Section: Resultsmentioning

confidence: 99%

“…MAE is found in various glass systems like bismuthate, arsenate, tungstate and borate glasses [6,7]. In our previous papers [8,9] we reported the mixed alkali effect in density, glass transition temperature, optical absorption and electron paramagnetic resonance of the mixed alkali borate, boroarsenate and borobismuthate glasses.…”

Section: Introductionmentioning

confidence: 88%

MIXED ALKALI EFFECT IN (40-x)K₂O–xLi₂O-10Na₂O–50B₂O₃ GLASSES—PHYSICAL AND OPTICAL ABSORPTION STUDIES

Samee

Ahmmad

Taqiullah

et al. 2013

Int. J. Mod. Phys. Conf. Ser.

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So far only a handful of publications have been concerned with the study of the mixed alkali effect in borate glasses containing three types of alkali ions. In the present work, the mixed alkali effect (MAE) has been investigated in the glass system (40–x) K2O–x Li2O –10Na2O–50B2O3. (0≤x≤40 mol%) through density and modulated DSC studies. The density and glass transition temperature of the present glasses varies non-linearly exhibiting mixed alkali effect. We report the mixed alkali effect in the present glasses through optical properties. From the absorption edge studies, the various values of optical band gap (Eo) and Urbach energy (ΔE) have been evaluated. The values of Eo and ΔE show non-linear behavior with compositional parameter showing the mixed alkali effect. The band gap energy based average electronic polarizability of oxide ions αO2–(Eo) , optical basicity A(Eo) , and Yamashita–Kurosawa’s interaction parameter A(Eo) have been examined to check the correlations among them and bonding character. Based on good correlation among electronic polarizability of oxide ions, optical basicity and interaction parameter, the present K2O– Li2O–Na2O–B2O3 glasses are classified as normal ionic (basic) oxides.

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Physical and optical studies in mixed alkali borate glasses with three types of alkali ions

Cited by 22 publications

References 41 publications

Mixed alkali effect in the physical and optical properties of xK₂O-(25-x)Na₂O-12.5MgO-12.5BaO-50B₂O₃ glasses

Mixed alkali effect in the physical and optical properties of xK₂O-(25-x)Na₂O-12.5MgO-12.5BaO-50B₂O₃ glasses

Mixed alkali effect in physical and optical properties of Li2O–Na2O–WO3–B2O3 glasses

MIXED ALKALI EFFECT IN (40-x)K₂O–xLi₂O-10Na₂O–50B₂O₃ GLASSES—PHYSICAL AND OPTICAL ABSORPTION STUDIES

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Physical and optical studies in mixed alkali borate glasses with three types of alkali ions

Cited by 22 publications

References 41 publications

Mixed alkali effect in the physical and optical properties of xK2O-(25-x)Na2O-12.5MgO-12.5BaO-50B2O3 glasses

Mixed alkali effect in the physical and optical properties of xK2O-(25-x)Na2O-12.5MgO-12.5BaO-50B2O3 glasses

Mixed alkali effect in physical and optical properties of Li2O–Na2O–WO3–B2O3 glasses

MIXED ALKALI EFFECT IN (40-x)K2O–xLi2O-10Na2O–50B2O3 GLASSES—PHYSICAL AND OPTICAL ABSORPTION STUDIES

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Mixed alkali effect in the physical and optical properties of xK₂O-(25-x)Na₂O-12.5MgO-12.5BaO-50B₂O₃ glasses

Mixed alkali effect in the physical and optical properties of xK₂O-(25-x)Na₂O-12.5MgO-12.5BaO-50B₂O₃ glasses

MIXED ALKALI EFFECT IN (40-x)K₂O–xLi₂O-10Na₂O–50B₂O₃ GLASSES—PHYSICAL AND OPTICAL ABSORPTION STUDIES