Temperature dependences of density of sodium borosilicate glasses in equilibrium states at temperatures below a vitrification temperature

Golubkov, V. V.; Onushchenko, P. A.

doi:10.1134/s1087659613010070

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…Values increased with increasing SO 3 , from 526°C for 0 mass% SO 3 to 543°C for 3.0 mass%. The range of T g values was consistent with that which has been previously reported in the literature . It should be noted that T g values found within the literature varied over a span of several hundred degrees depending on network modifiers and the ratios of the compositional elements.…”

Section: Resultssupporting

confidence: 89%

“…The range of T g values was consistent with that which has been previously reported in the literature. 41,42 It should be noted that T g values found within the literature varied over a span of several hundred degrees depending on network modifiers and the ratios of the compositional elements. Therefore, the ~20°C change that was observed for the maximum sulfur loading seemed to have less effect on thermal stability than the baseline glass composition chosen without sulfur.…”

Section: Glass Transition Temperaturementioning

confidence: 99%

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Thermal properties of sodium borosilicate glasses as a function of sulfur content

et al. 2020

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Sulfur trioxide (SO3) additions, up to 3.0 mass%, were systematically investigated for effects on the physical properties of sodium borosilicate glass melted in air, with a sulfur‐free composition of 50SiO2–10Al2O3–12B2O3–21Na2O–7CaO (mass%). Solubility measurements, using electron microscopy chemical analysis, determined the maximum loading to be ~1.2 mass% SO3. It was found that measured sulfur (here as sulfate) additions up to 1.18 mass% increased the glass transition temperature by 3%, thermal diffusivity by 11%, heat capacity by 10%, and thermal conductivity by 20%, and decreased the mass density by 1%. Structural analysis, performed with Raman spectroscopy, indicated that the borosilicate network polymerized with sulfur additions up to 3.0 mass%, presumably due to Na2O being required to charge compensate the ionic SO42- additions, thus becoming unavailable to form non‐bridging oxygen in the silicate network. It is postulated that this increased cross‐linking of the borosilicate backbone led to a structure with higher dimensionality and average bond energy. This increased the mean free paths and vibration frequency of the phonons, which resulted in the observed increase in thermal properties.

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Section: Resultssupporting

confidence: 89%

Section: Glass Transition Temperaturementioning

confidence: 99%

Thermal properties of sodium borosilicate glasses as a function of sulfur content

et al. 2020

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“…It can be underlined that the Tg values of all La borosilicate glasses always remain significantly higher than those of alkali borosilicate glasses for which Tg always remains lower than 600°C [79,80]. This difference can be explained by the high field strength of RE 3+ ions in comparison with alkali ions which are less strongly bonded to NBOs.…”

Section: Evolution Of Glass Transformation Temperaturementioning

confidence: 94%

Exploration of glass domain in the SiO2-B2O3-La2O3 system

Trégouët

Caurant

Majérus

et al. 2017

Journal of Non-Crystalline Solids

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The existence of a relatively wide glass domain has been put in evidence in the SiO2-B2O3-La2O3 ternary system, using a melt-quenching method. This domain extends from a region surrounding the lanthanum metaborate (LaB3O6) composition in the B2O3-La2O3 binary system to ternary compositions bearing up to 39 mol% SiO2. Outside this domain, phase separation phenomena and/or crystallization of La-rich borate (LaBO3) and borosilicate (La3Si2BO10) phases are observed during quenching. The evolution of glass transition temperature (Tg) with composition in the glassy domain has been studied and discussed according to structural changes put in evidence by 11 B MAS NMR. Moreover, the evolution of the thermal stability of a series of glasses derived from a lanthanum metaborate glass by substituting B2O3 by increasing amount of SiO2 (up to 36 mol% SiO2) was studied by DTA and thermal treatments followed by characterization by XRD and Raman spectroscopy. In spite of silica-enrichment along the glass series, the first phases crystallizing during heating were always lanthanum borates (LaB3O6, LaBO3) according the following sequence when SiO2 content increases:

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“…Fajans and Barber reported already in 1952 that boron oxide has vitreous, crystalline and liquid states [9]. Vitreous states are below 300 • C, crystalline boron oxide has a melting point already at 450 • C and liquid states start around 500 • C. Golubkov and Onushchenko investigated sodium borosilicate glasses [10]. Vitrification temperatures for their sodium borosilicate glasses were 490-581 • C and transition temperatures from super-cooled liquid to solid non-crystalline states were about 50 • C lower.…”

Section: Jinst 17 P07031mentioning

confidence: 99%

“…We considered the initial stress in our fiber as 450 × 10 6 N/m 2 to match the simulation results with our experimental data. It should be noted that there exists a vitrification process within the sodium borosilicate occurring around 480 • C [10], which gives rise to a sharp discontinuity in the thermal expansion coefficient of the material. We have taken this into account by using a piecewise thermal expansion coefficient for: 2.05 × 10 −6 1/K at temperatures lower than 480 • C and 3.32 × 10 −6 1/K above.…”

Section: Comsol Modeling For the Panda Pm Fiber At High Temperaturesmentioning

confidence: 99%

A Panda fiber temperature sensor up to 900°C

et al. 2022

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The use of Panda-type polarization-maintaining (PM) fiber for the localized sensing of high temperatures was analyzed with simulations and experiments up to 900°C. Accuracy and repeatability of the results started to decline above 800°C. Fused silica optical fiber melts at 1700°C, which sets an ultimate limit for measurable temperatures. In practice, optical fiber birefringence restricts the maximum temperature to 1060°C where PM fiber loses its ability to maintain polarization. Three sensor fibers (4, 5 and 10 cm long) were spliced at 45° angles to input/output fibers and calibrated in an oven from room temperature to 850–900°C temperature range. Two superluminescent light-emitting diodes (SLEDs) were coupled together as a broadband light source. Birefringence-induced change of the polarization in the sensor fiber was measured with a polarization splitter and an optical spectrum analyzer (OSA) as a function of the wavelength. Temperature-dependent birefringence generates a sinusoidal reflection spectrum from the input polarization mode to the orthogonal output polarization mode. Temperature changes could be concluded from variations in these spectra. Finally, a small fusion device, NORTH, at DTU, Denmark was successfully used as a testbed to make sure that the sensors can handle transportation and the instrumentation required for vacuum operation and still produce sensible data from a harsh environment.

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Temperature dependences of density of sodium borosilicate glasses in equilibrium states at temperatures below a vitrification temperature

Cited by 8 publications

References 7 publications

Thermal properties of sodium borosilicate glasses as a function of sulfur content

Thermal properties of sodium borosilicate glasses as a function of sulfur content

Exploration of glass domain in the SiO2-B2O3-La2O3 system

A Panda fiber temperature sensor up to 900°C

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