High thermal expansion of crystallized glasses in the system BaO–ZnO–NiO–SiO2

Thieme, Christian; Rüssel, Christian

doi:10.1016/j.ceramint.2015.07.114

Cited by 15 publications

(16 citation statements)

References 31 publications

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“…In the case of the Sr‐free sample, the dilatation curve exhibits a kink at around 400°C. This can be attributed to the phase transition of BaZn 2 Si 2 O 7 already described in the literature . The mismatch in the phase transition temperatures observed in glass‐ceramics (around 400°C) and single‐phase ceramic materials (280°C) is caused by stresses inside the glass‐ceramics, as explained more in detail in Ref.…”

Section: Resultssupporting

confidence: 55%

“…The mismatch in the phase transition temperatures observed in glass‐ceramics (around 400°C) and single‐phase ceramic materials (280°C) is caused by stresses inside the glass‐ceramics, as explained more in detail in Ref. At temperatures below the kink, high thermal expansion is observed and above, low thermal expansion can be found. If SrO is introduced into the glass and hence also into the crystal phase, the temperature of the phase transition, that is, the temperature of the kink decreased.…”

Section: Resultsmentioning

confidence: 98%

“…This phase is known as a possible component of low thermal expansion materials . However, it will not precipitate from typical sealing glass compositions of the ternary system BaO–ZnO–SiO 2 because of the preferred formation of ternary barium zinc silicates and binary barium silicates . Up to now, the thermal expansion behavior was not yet reported for all these ternary phases.…”

Section: Introductionmentioning

confidence: 97%

“…9 However, it will not precipitate from typical sealing glass compositions of the ternary system BaO-ZnO-SiO 2 because of the preferred formation of ternary barium zinc silicates and binary barium silicates. 4,10,11 Up to now, the thermal expansion behavior was not yet reported for all these ternary phases. Nevertheless, almost all thermal expansion coefficients reported up to now for crystalline phases in this system are >10 9 10 À6 K À1 .…”

Section: Introductionmentioning

confidence: 97%

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Glass‐Ceramics in the System BaO–SrO–ZnO–SiO₂ with Adjustable Coefficients of Thermal Expansion

2016

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Glasses from the system BaO-SrO-ZnO-SiO 2 with different Ba/Sr ratios were characterized regarding crystallization behavior as well as the thermal expansion of almost fully crystallized glasses. Depending on the SrO concentration, different crystalline phases precipitate from the glasses. Those with low SrO concentrations precipitate crystals with the structure of low-temperature BaZn 2 Si 2 O 7 as one of the major phases. Higher SrO concentrations cause the formation of Ba 1 -x Sr x Zn 2 Si 2 O 7 solid solutions with the structure of high-temperature BaZn 2 Si 2 O 7 . Both, the low-as well as the high-temperature phase exhibit very different thermal expansion behaviors ranging from a very high coefficient of thermal expansion in the case of the low-temperature phase to a very low coefficient of thermal expansion in the case of the high-temperature phase. The glass-ceramics with the highest and that with the lowest coefficient of thermal expansion measured between 100°C and 800°C show a difference of 7.9 3 10 -6 K -1 , which is caused solely by a substitution of BaO with SrO. In contrast, the maximum variation in the thermal expansion of the glasses was only 1.5 3 10. The microstructure of sintered and afterward crystallized glass powders was analyzed via scanning electron microscopy and showed crack-free samples with low porosity.

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Glass‐Ceramics in the System BaO–SrO–ZnO–SiO₂ with Adjustable Coefficients of Thermal Expansion

2016

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“…Typical CTE values of such materials are in the range from 8 to 12·10 −6 K −1 , according to the CTEs of the respective crystalline phases 7, 10 . However, even higher values up to above 17·10 −6 K −1 can be obtained by the precipitation of BaZn 2 Si 2 O 7 and isostructural solid solutions, in which Zn 2+ is partially replaced by other bivalent cations of similar ionic radii 11, 12 . The thermal expansion behavior of BaZn 2 Si 2 O 7 is almost temperature independent and very high below a phase transition at around 280 °C 13 .…”

Section: Introductionmentioning

confidence: 99%

Variable thermal expansion of glass-ceramics containing Ba1−xSrxZn2Si2O7

Thieme

Schlesier

Dike

et al. 2017

Sci Rep

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Up to now, the thermal expansion behavior of multiphase glass-ceramics cannot be predicted reliably because of the nescience about the formation of the type and concentration of crystalline phases. In the system BaO-SrO-ZnO-SiO2, recently a new phase based on Ba1−xSrxZn2Si2O7 solid solutions was found, which exhibits unexpected low and highly anisotropic thermal expansion, which can be used for an adjustment of the thermal expansion properties. In the case of sealing materials for high-temperature reactors, the formation of this phase should be avoided. Hence, in this manuscript the concentration thresholds in which these solid solutions precipitate from glasses were determined. The phase analysis was correlated with the thermal expansion behavior of the glass-ceramics. Depending on the Ba/Sr-ratio of the glasses and the considered temperature range, the coefficients of thermal expansion of the glass-ceramics vary between 19.4·10−6 K−1 and 4.8·10−6 K−1. The concentration thresholds in which the as mentioned phases form via crystallization of glasses differ strongly from the literature values obtained via conventional ceramic mixed oxide route.

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Review on silicate and borosilicate‐based glass sealants and their interaction with components of solid oxide fuel cell

Singh

Walia

2021

Intl J of Energy Research

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A lot of research is going on in the field of glass science to commercialize solid oxide fuel cells (SOFCs). Still, it is a big challenge to develop appropriate glass sealants for a longer duration and sustaining in the operating conditions of this power source. Mixed alkaline earth metal oxides containing silicate or borosilicate glasses could be most suitable as a rigid glass sealant in SOFCs in comparison with borate-and phosphate-based glass sealants. In this review article, the need for the sealants in the planar design of SOFCs, the effect of different modifiers, and intermediate oxides on sealing properties of glasses and glassceramics, particularly, silicate-and borosilicate-based glass sealants have been reviewed. Interaction study of glass sealants with common electrolytes and interconnect materials is also overviewed in this article. In addition to these, future perspectives and suggestions for suitable seal development are also proposed. Novelty statementThis review article is related to the glass sealants for a highly efficient and environment friendly solid oxide fuel cell energy conversion device. Still, it is a big challenge to develop an appropriate sealant to commercialize this energy device. This article provides the researchers with not only progress and latest development in the field of glass sealants but also suggestion and future prospects to develop the sealants.

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High thermal expansion of crystallized glasses in the system BaO–ZnO–NiO–SiO2

Cited by 15 publications

References 31 publications

Glass‐Ceramics in the System BaO–SrO–ZnO–SiO₂ with Adjustable Coefficients of Thermal Expansion

Glass‐Ceramics in the System BaO–SrO–ZnO–SiO₂ with Adjustable Coefficients of Thermal Expansion

Variable thermal expansion of glass-ceramics containing Ba1−xSrxZn2Si2O7

Review on silicate and borosilicate‐based glass sealants and their interaction with components of solid oxide fuel cell

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High thermal expansion of crystallized glasses in the system BaO–ZnO–NiO–SiO2

Cited by 15 publications

References 31 publications

Glass‐Ceramics in the System BaO–SrO–ZnO–SiO2 with Adjustable Coefficients of Thermal Expansion

Glass‐Ceramics in the System BaO–SrO–ZnO–SiO2 with Adjustable Coefficients of Thermal Expansion

Variable thermal expansion of glass-ceramics containing Ba1−xSrxZn2Si2O7

Review on silicate and borosilicate‐based glass sealants and their interaction with components of solid oxide fuel cell

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Glass‐Ceramics in the System BaO–SrO–ZnO–SiO₂ with Adjustable Coefficients of Thermal Expansion

Glass‐Ceramics in the System BaO–SrO–ZnO–SiO₂ with Adjustable Coefficients of Thermal Expansion