Spectroscopic studies of structural interactions in silicate-borate-phosphate glass

Łagowska, Barbara; Wacławska, I.; Sitarz, Maciej; Szumera, Magdalena

doi:10.1016/j.molstruc.2018.05.085

Cited by 31 publications

(20 citation statements)

References 45 publications

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“…The SEM-EDS method did not allow to determine the presence of boron in the separated phases: silicate and phosphate. However, our results [16] based on detailed analysis of MIR and Raman spectroscopic spectra clearly indicated the presence of Si-O-Si, Si-O-P and P-O-P connections as well as P-O-B and Si-O-B connections in the structure of the analysed glasses. It suggests that boron occurs in both separated phases.…”

Section: Phase Separation Phenomenonmentioning

confidence: 48%

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Glass transition effect in liquation silicate–borate–phosphate glasses

Łagowska

Wacławska

Sułowska

et al. 2019

J Therm Anal Calorim

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Glass transformation effect of liquation glasses from the SiO 2-B 2 O 3-P 2 O 5-K 2 O-MgO-CaO system was studied by DSC, SEM-EDS and 31 P, 29 Si and 11 B MAS NMR spectroscopy methods. The relation between the B 2 O 3 content in the analysed glasses and phase separation phenomenon, structure and glass transition effects was discussed. It was shown that increasing content of B 2 O 3 causes the formation of P-O-B III , P-O-B IV and Si-O-B III and Si-O-B IV bonds which results in the appearance of liquation in analysed glasses. Simultaneously, double glass transition effect was observed with gradual decrease of T g and E a values. The observed relations were explained using crystalochemical parameters (i G , L) of chemical bonds present in the structure of analysed glasses.

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Section: Phase Separation Phenomenonmentioning

confidence: 48%

“…The introduction of increasing amounts of B 2 O 3 into the glass composition resulted in intensification of its opalescence, until the glass was completely opaque. The XRD studies of synthesized glasses indicated that obtaining a fully amorphous material is possible only at a content of B 2 O 3 not exceeding of 25 mol% [16].…”

Section: Glass Synthesismentioning

confidence: 99%

Glass transition effect in liquation silicate–borate–phosphate glasses

Łagowska

Wacławska

Sułowska

et al. 2019

J Therm Anal Calorim

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“…In Figure 2c,d, the new band at ~1132 cm −1 may be due to P-O − stretching vibrations in terminator units of Q 1 chains [4,18]. Another new band at ~1289 cm −1 is associated with the asymmetric stretching vibrations of P=O bonds [4,19]. The relative area dependence of five different bands was obtained.…”

Section: Composition and Structure Of Glassesmentioning

confidence: 82%

Spectroscopic and Surface Crystallization Characterizations of Yttrium-Doped Phosphate Glasses

Zou

Sun³

et al. 2022

Crystals

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The composition, structure, and thermal behaviors of yttrium-containing phosphate glasses were studied in this work, and the glass-ceramics were prepared via the two-step crystallization method. The XRD and SEM-EDS results show the forming range of the phosphate glass system and the formation of YPO4 (xenotime) due to the addition of excessive Y2O3. The spectroscopic characterization of these glasses presented shifts of the infrared and Raman bands, demonstrating the depolymerization of the glass network and the formation of novel P–O–Y bonds, and the deconvoluted Raman spectra also exhibited the occurrence of the disproportionation reaction in the glass melting process. The content of non-bridging oxygen (NBOs) from the UV–vis spectra first increased and then decreased with increasing Y2O3. The thermal behaviors show that the Y2O3 reduced the crystallization peak temperature and the thermal stability of the glasses. The crystalline behaviors of the phosphate glass matrix were investigated at different crystallization times of 2–10 h, and a transformation of the crystallization mechanism from surface to volume crystallization was found. The yttrium phosphate glass-ceramics crystallized for 10 h exhibited transformation of the main crystalline phases with increasing Y2O3, and the grain-oriented crystalline surface became irregular.

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“…35,36) The other one is between 800 cm − 1 and 1 100 cm − 1 associated with the vibration of bridging oxygen in [SiO 4 ] tetrahedron. [27][28][29][30] The Raman peak of the band at about 970 cm − 1 shifted to the lower frequency region with increasing CeO 2 content, since CeO 2 played the role of the network modifier in the experimental mold fluxes as explained specifically in the following sections of the Raman analyses. Figure 9 shows the deconvoluted results of Raman spectra of the CaF 2 -bearing mold fluxes with different CeO 2 con-tents.…”

Section: Effects Of Ceo 2 On the Structurementioning

confidence: 95%

“…[24][25][26][27] Raman spectroscopy was usually used to study the structure of the melts. Many previous [28][29][30] studies investigated the viscosity of liquid slags and characterized them from the viewpoint of microscopic structure, such as CaO-SiO 2 -MgO-Al 2 O 3 systems, CaO-BaO-SiO 2 -MgO-Al 2 O 3 slags, and Na 2 O-MgO-CaO-SiO 2 glasses. Therefore, the effect of CeO 2 on the viscosity of mold fluxes and the mechanism of viscosity and structure needs to be studied systematically.…”

Section: Effects Of Ceo 2 On Melting Temperature Viscosity and Strumentioning

confidence: 99%

Effects of CeO2 on Melting Temperature, Viscosity, and Structure of CaF2-bearing and B2O3-containing Mold Fluxes for Casting Rare Earth Alloy Heavy Rail Steels

et al. 2019

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Rare earth have been widely used in the heavy rail steels to improve the impact toughness, yield strength, and high-temperature plasticity by deforming inclusions and refining grains. However, amounts of rare earth oxides with high melting temperatures can be generated and enter the mold fluxes, which has a significant influence on the lubrication and the heat transfer capability of mold fluxes and even the smooth of the continuous casting process. Thus in this work, effects of different CeO 2 contents on melting temperature, viscosity, and structure of the CaF 2-bearing mold fluxes and the B 2 O 3-containing mold fluxes for casting the rare earth alloy heavy rail steels were investigated systemically. Besides, the mechanisms of the viscosity and structure were discussed. Results show that CeO 2 increases the melting temperature and decreases the viscosity at high temperature of both two mold fluxes. The break temperature of the CaF 2-bearing mold fluxes increases heavily with the addition of CeO 2. Analyses of Raman spectra and the 11 B magic angle spinning nuclear magnetic resonance spectra (11 B MAS NMR) show that CeO 2 enhances the de-polymerization of the network structure of two mold fluxes, leading to the decrease of viscosity at each temperature.

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Spectroscopic studies of structural interactions in silicate-borate-phosphate glass

Cited by 31 publications

References 45 publications

Glass transition effect in liquation silicate–borate–phosphate glasses

Glass transition effect in liquation silicate–borate–phosphate glasses

Spectroscopic and Surface Crystallization Characterizations of Yttrium-Doped Phosphate Glasses

Effects of CeO<sub>2</sub> on Melting Temperature, Viscosity, and Structure of CaF<sub>2</sub>-bearing and B<sub>2</sub>O<sub>3</sub>-containing Mold Fluxes for Casting Rare Earth Alloy Heavy Rail Steels

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