The local structure of bismuth borate glasses doped with europium ions evidenced by FT-IR spectroscopy

Păşcuţă, Petru; Pop, Lidia; Rada, S.; Bosca, M.; Culea, E.

doi:10.1007/s10854-007-9359-5

Cited by 132 publications

(65 citation statements)

References 24 publications

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“…DTc is a good indication of thermal stability because the higher the value of this difference, the more is the delay in the nucleation process [10]. Figure 4 shows the glass-forming ability as a function of copper oxide content.…”

Section: Resultsmentioning

confidence: 99%

Effect of copper oxide on structure and physical properties of lithium lead borate glasses

Kashif

Ratep

2015

Appl. Phys. A

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Copper-doped Lead lithium borate glass samples with the composition of (35-x) Pb 3 O 4 -xCuO-65Li 2-B 4 O 7 , where x = 5, 10, 15 or 20 mol%, have been prepared by melt quenching technique. Glass-forming ability, density, electrical conductivity, magnetic susceptibility and structural properties of lead lithium borate glasses have been investigated. IR spectroscopic data show that the copper ions play the role of glass modifier. Addition of CuO influences BO 3 $ BO 4 conversion. Density is expressed in terms of the structural modifications that take place in glass matrix. The increase in Tg reflects an increase in bond strength, and samples obtain more rigid glass structure. Electrical conductivity and magnetic susceptibility v data show a variable behavior with the increase in the copper content in two valance states Cu ? and Cu ?2 . In addition, optical properties depend on the change of the role of copper ions in the samples' structure. Optical energy band gap E opt and Urbach energy E tail are determined. The increase in E opt and UV cutoff with an increase in CuO content is due to the decrease in nonbridging oxygen concentration. The decrease in E tail at higher concentrations is attributed to the copper ion accumulation in the interstitial positions and to the formation of orthoborate groups. These samples are suitable for the green light longpass filters.

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Section: Resultsmentioning

confidence: 99%

Effect of copper oxide on structure and physical properties of lithium lead borate glasses

Kashif

Ratep

2015

Appl. Phys. A

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“…The [BO 3 ] units in the iron sodium lead borate glasses prefer a coordination change to [BO 4 ] rather than producing NBOs. The four-fold boron atoms are favored in the investigated system as compared with the three-fold ones [47].…”

Section: Infrared Transmission Spectramentioning

confidence: 91%

Influence of Fe2O3 on the physical, structural and electrical properties of sodium lead borate glasses

2014

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Abstract:The influence of adding Fe 2 O 3 at the expense of Na 2 O in sodium lead borate glasses on the structural, physical and electrical properties have been investigated. Results obtained from Fourier transform infrared (FTIR) spectra indicated that Fe 2 O 3 plays an important role in converting three coordinated boron atoms [BO 3 ] to four coordinated boron atoms [BO 4 ]. The physical properties such as density and molar volume helped to evaluate the compact structure of the prepared glass samples due to presence of [BO 4 ] groups. The increase of Fe 2 O 3 /Na 2 O replacements led to increasing the microhardness values and decreasing the thermal expansion coefficients of the studied glasses. The increase of Fe 2 O 3 /Na 2 O replacements generally decreased the AC conductivity. That decrease might be due to converting of the three coordinated boron atoms [BO 3 ] to four coordinated boron atoms [BO 4 ]. Dielectric constants of the samples might be an indication of the distortion in the coordinated boron atoms. The obtained experimental data indicated the internal structure of glass network and the change of the structure of the samples from three [BO 3 ] to four coordinated boron atoms [BO 4 ].

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“…Assignment has been suggested for 1274cm -1 band in the Raman spectra of pyroborate groups, involving primarily the stretching of the terminal B-O -bonds [11,12]. This is confirmed from the fact that in the present glasses, the band observed at 700-712cm -1 in infrared spectra is assigned to B-O-B bending vibrations in [BO 3 ] triangles while the strong bands in the range 1195cm -1 is assigned for stretching vibrations of B-O bonds in BO 3 units from meta and ortho-borate groups [8 ] and 1365cm -1 arises from B-O -bonds stretching in BO 3 units from varied types of borate groups respectively [9,13,14].…”

Section: Resultsmentioning

confidence: 56%

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

Kumar

Edukondalu

Muralimohan

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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IntroductionThe interest in heavy metal oxide glasses is due to their long infrared cut-off and optical non-linearity [1]. Bismuth based oxide glasses have attracted the attention of scientific community, due to their important applications in the field of glass ceramics, thermal and mechanical sensors etc. a survey of literature shows that there are many reports available on quaternary bismuth borate glasses [2,3]. The present work is focused on studying the effect of Bi 2 O 3 and Li 2 O on cadmium borate quaternary glass system. The presence of the two glass formers Bi 2 O 3 and B 2 O 3 increases the interest in present study.

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The local structure of bismuth borate glasses doped with europium ions evidenced by FT-IR spectroscopy

Cited by 132 publications

References 24 publications

Effect of copper oxide on structure and physical properties of lithium lead borate glasses

Effect of copper oxide on structure and physical properties of lithium lead borate glasses

Influence of Fe2O3 on the physical, structural and electrical properties of sodium lead borate glasses

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

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The local structure of bismuth borate glasses doped with europium ions evidenced by FT-IR spectroscopy

Cited by 132 publications

References 24 publications

Effect of copper oxide on structure and physical properties of lithium lead borate glasses

Effect of copper oxide on structure and physical properties of lithium lead borate glasses

Influence of Fe2O3 on the physical, structural and electrical properties of sodium lead borate glasses

Spectroscopic studies of xLi2O-(40-x)Bi2O3-20CdO-40B2O3 Glasses

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Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses