The structural role of tellurium dioxide in lead borophosphate glasses

Koudelka, Ladislav; Rösslerová, Ivana; Černošek, Zdeněk; Mošner, Petr; Montagne, Lionel; Revel, Bertrand

doi:10.1016/j.jnoncrysol.2014.01.044

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…The weak band at 777-780 cm -1 can be ascribed to the symmetric strength vibration of BO3 and BO4 groups (Vyatchina et al, 2009). The weak band at 615-624 cm -1 can be ascribed to the vibrations of oxygen atoms in P-O-P bridges between metaphosphate Q 2 and diphosphate Q 1 units (Koudelka et al, 2014). The weak band located at 480-482 cm -1 can be ascribed to the bending mode vibration of SO4 2- (Ganguli and Rao, 1999).…”

Section: Raman Spectramentioning

confidence: 97%

Structural characterization of sulphate borophosphate glasses containing calcium oxide

Yamusa

Hussin

Shamsuri

et al. 2017

Mal. J. Fund. Appl. Sci.

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Increasing demands for better perfoming glasses have lead to current investigating of the sturctural properties of glasses for optimum performances. Calcium sulphate borophosphate glasses of different compositions were prepared using melt quenching technique. The glass forming ability and stability were checked using Differential thermal analyzer (DTA). Density and molar volume had been evaluated and analyzed. From the results of XRD, the absent of discrete and continuous sharp peaks confirmed the amorphous nature of the glass compositions while the results from both IR and Raman revealed the existence of SO4, BO4, BO3, P-O-P and PO43-. Addition of CaSO4 to borophosphate influenced the conversion of the dominant BO3 groups to BO4 groups. The structure of the samples was mainly based on metaphosphate, diphosphate and BO4 units, which became depolymerized with addition of CaSO4 content. The glass forming ability and thermal stability were found to increase with an increase in the concentration of modifier content. Glass density and molar volume is found to be between 2.146 to 2.314 gcm-3 and 45.794 to 48.880 m3mol-1 respectively. It is observed that the density of glass increased while the molar volume also increased with respect to increase in concentration of CaSO4 in the glass compositions. We analysed our data using different mechanisms and compared the results with previous works. Our findings show that this glass could be beneficial and considered as a good candidate for optical devices applications.

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Section: Raman Spectramentioning

confidence: 97%

Structural characterization of sulphate borophosphate glasses containing calcium oxide

Yamusa

Hussin

Shamsuri

et al. 2017

Mal. J. Fund. Appl. Sci.

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“…The bands lying at 620-630 cm À1 and 660-670 cm À1 are related to the stretching vibrations of TeO 4 trigonal bipyramids, whereas the vibrations at 720-750 cm À1 and 760-800 cm À1 are associated with stretching vibrations of TeO 3 trigonal pyramids. 196 Zinc oxide plays an important role in the modication of borate and phosphate structural units. In the spectra, a sharp band at 808 cm À1 is characteristic of B 2 O 3 and the band at 968 cm À1 is caused by the vibrations of isolated PO 4 units in the structural network of borophosphate glasses.…”

Section: Borophosphate Glassesmentioning

confidence: 99%

A review of the structures of oxide glasses by Raman spectroscopy

2015

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“…This indicates that smaller Te-clusters (Te 2 and, potentially, Te 4 ) grow into Te 6 and transform into later semi-metallic Te or are dissolved as TeO 2 in the glass matrix. This process leads to a new band at 620 cm −1 , which corresponds to the axial symmetric stretching mode of the Te ax −O in the TeO 4 tetrahedra [22,43]. Based on previous DFT calculations, the Te 6 clusters exhibit visible emission (at 457 nm), indicating that the Te 6 clusters do not contribute to the NIR emission [32].…”

Section: Resultsmentioning

confidence: 85%

Broadband NIR-emitting Te cluster-doped glass for smart light source towards night-vision and NIR spectroscopy applications

Tan

Kang

et al. 2022

Photon. Res.

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Broadband near-infrared (NIR)-emitting materials are crucial components of the next generation of smart NIR light sources based on blue light-emitting diodes (LEDs). Here, we report a Te cluster-doped borate glass, which exhibits ultra-broadband emission around 980 nm with a full-width at half-maximum (FWHM) of 306 nm under blue light excitation. We propose adjustments of glass chemistry and processing condition as a means for topo-chemical tailoring of the NIR photoemission characteristics in such materials. Through implementing strongly reducing conditions during glass melting, Te clusters with broad NIR photoluminescence can be generated and stabilized once the melt is vitrified to the glassy state. Tunability of the NIR emission peak over the wavelength range of 904 to 1026 nm is possible in this way, allowing for fine adjustments of spectral properties relative to the stretching vibrations of common chemical bonds, for example, in water, proteins, and fats. This potentially enables high sensitivity in NIR spectroscopy. We further demonstrate potential application of glass-converted LEDs in night vision.

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The structural role of tellurium dioxide in lead borophosphate glasses

Cited by 7 publications

References 14 publications

Structural characterization of sulphate borophosphate glasses containing calcium oxide

Structural characterization of sulphate borophosphate glasses containing calcium oxide

A review of the structures of oxide glasses by Raman spectroscopy

Broadband NIR-emitting Te cluster-doped glass for smart light source towards night-vision and NIR spectroscopy applications

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