BaO–La2O3–B2O3–TiO2–SiO2 glass production

Levitskii, I. A.; Dyadenko, M. V.; Papko, L. F.

doi:10.1007/s10717-012-9379-3

Cited by 7 publications

(7 citation statements)

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“…3). This glass domain, significantly wider than those already prospected by Sigaev et al [11] (close to the stillwellite LaBSiO5 composition) and Levitskii et al [12] (Fig. 1), is limited by glass-in-glass immiscibility for the highest SiO2 and/or B2O3 concentrations and by high crystallization tendency of lanthanum borate and borosilicate phases for the highest La2O3 concentrations during melt quenching.…”

Section: Extension Of the Glass Domainsupporting

confidence: 49%

“…A recent study on high refractive-index glasses, related to the BaO-La2O3-B2O3-TiO2-SiO2 system, also started from the SiO2-B2O3-La2O3 ternary system [12]. In comparison with the works performed on glasses with composition close to stillwellite presented above, a wider zone of the diagram was explored by these authors (Fig.…”

Section: Glassy Phasesmentioning

confidence: 96%

“…Moreover, these glasses exhibit refractive index between 1.63 and 1.72 and their linear thermal expansion coefficient (CLTE) varies in the range (60-70).10 -7°C-1 . Several structural characterizations were performed on homogeneous glasses by IR spectroscopy, indicating that the introduction of increasing La2O3 amount induced a decrease of the silicate network polymerization and an increase of the proportion of BO3 units [12]. Once again, the authors did not report any NMR study of their glasses.…”

Section: Glassy Phasesmentioning

confidence: 99%

“…In this work, we focus our interest on RE = La because La is one of the most abundant RE in nuclear waste [2] and it enables to perform NMR characterization (La 3+ ion is not paramagnetic). It appears that only few data have been gathered on the possibility to prepare glasses in the SiO2-B2O3-La2O3 ternary system [11,12]. Moreover, to the best of our knowledge, no phase diagram has been reported in literature for this ternary system with La2O3 or any of the other RE oxides.…”

Section: Introductionmentioning

confidence: 99%

“…The error in the determination of Tg (onset point on the DTA curves) is estimated close to ± 2°C. Uncertainties on EPMA determinations: SiO2 (0.2 -0.5 mol%), B2O3 (1 -2 mol%), La2O3 (0.1 -0.2 mol%).Figures captionTernary SiO2-B2O3-La2O3 diagram showing the compositions (in mol%) studied in literature[11,12] to prepare glasses. The glasses reported in the binary B2O3-La2O3 system by Chakraborty et al[7] are also indicated (melts were cooled in air in the crucibles).…”

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confidence: 99%

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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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Section: Extension Of the Glass Domainsupporting

confidence: 49%

Section: Glassy Phasesmentioning

confidence: 96%

Section: Glassy Phasesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

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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Investigation of Glass Formation and the Properties of Lanthanum-Aluminum-Borosilicate Glasses with High Lanthanum Oxide Content

2019

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Oxidation Resistance and Evolution of Multi-layered Oxide Scale During Isothermal and Cyclic Exposure of ZrB2–SiC–LaB6 Composites at 1300 °C to 1500 °C

Kashyap

Sala

Mitra

2021

Metall Mater Trans A

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The effect of LaB 6 (7, 10, and 14 vol pct) addition on oxidation behavior of spark plasma-sintered ZrB 2 -20 vol pct SiC composites involving heating under non-isothermal condition till 1400 °C, and isothermal and cyclic exposures at 1300 °C to 1500 °C have been examined. The mass gain of the composite with 14 vol pct LaB 6 is found as the highest during non-isothermal oxidation, whereas it appears as the least on isothermal exposure for 24 hours at 1400 °C or 1500 °C. The mass gain after 24 cycles of 1-hour exposure at 1300 °C to 1500 °C is found to be lower than that recorded under isothermal condition for all the composites, with the difference decreasing with LaB 6 content. The oxidation exponent (n) is found to decrease to near parabolic rate law with the increase in cyclic exposure temperature. The parabolic rate constant (k p ) is found to decrease with the increase in LaB 6 content after a few cycles of exposure at all the investigated temperatures. The oxide scales formed on isothermal exposure at 1400 °C or 1500 °C have shown a thin La 2 Si 2 O 7 layer with borosilicate glass (BSG) as the outer layer, followed by layers containing BSG along with coarse and fine ZrO 2 , and a SiC-depleted ZrB 2 layer. The oxide scales formed during cyclic exposure contain an outer compact layer comprising BSG, La 2 Si 2 O 7 , and ZrSiO 4 , followed by ZrO 2 + BSG. Additionally, a SiC-depleted layer is found at the oxide-composite interface on cyclic exposure at 1500 °C for 24 hours, and at 1400 °C for 100 hours. The outer compact layer appears to have a critical role in protection against oxidation, with k p decreasing with the increase in its thickness.

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BaO–La2O3–B2O3–TiO2–SiO2 glass production

Cited by 7 publications

References 0 publications

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

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

Investigation of Glass Formation and the Properties of Lanthanum-Aluminum-Borosilicate Glasses with High Lanthanum Oxide Content

Oxidation Resistance and Evolution of Multi-layered Oxide Scale During Isothermal and Cyclic Exposure of ZrB2–SiC–LaB6 Composites at 1300 °C to 1500 °C

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