Microstructure transformation of a crystallized glass from the system BaO‐SrO‐ZnO‐SiO₂

Abstract

Glass-ceramics from the studied system are able to precipitate a crystalline phase with an anomalous and low coefficient of thermal expansion. Besides the crystalline phase called LEAZit (Low Expansion Alkaline Earth Zinc Silicate), other phases appear within those glass-ceramics. In order to understand the thermal expansion behavior of the whole material, the phase content has to be known as a function of the composition and the chosen heat treatment. In this paper, a glass with the molar composition 5 BaO ⋅ 12 SrO ⋅ 35 ZnO ⋅ 46.2 SiO 2 ⋅ 1.5 Sb 2 O 3 ⋅ 0.3 Ag is studied using X-ray tomography. With this method, the phase content can be studied in detail together with the microstructure. An ex-situ workflow was used to study one and the same sample after different heat treatments, which makes it possible to characterize the structures (crystalline phase, residual matrix, and porosity) inside the sample in a nondestructive way. The size of the different phases was characterized with a strut thickness analysis of the three-dimensional datasets. The tomographic results are supported by results from X-ray diffraction as well as scanning electron microscopy in combination with elemental analysis.

Laser‐based sample preparation for high‐resolution X‐ray‐computed tomography of glasses and glass ceramics

“…An illustrative example is given in the following paragraph, whereas details of the study can be found in Ref. 40. Again, a glass ceramic from the system Ba 1‐ x Sr x Zn 2 Si 2 O 7 has been investigated.…”

Solid solutions based on BaZn2Si2O7 with thermal expansions from negative to highly positive – a review

“…19, it has been confirmed experimentally on similar glass compositions by EDX that the dark phase is enriched in SiO 2 . 68 The thermal expansion is strongly affected by the grain size of the used glass powder. In general, the CTE is more negative, if the used grain size is larger.…”

“…19, it has been confirmed experimentally on similar glass compositions by EDX that the dark phase is enriched in SiO 2 . 68…”

Enhancing the Electrical and Photoelectrical Efficacy with the Synergistic SrO–ZnO Nano‐Heterosystem

“…[28] For instance, in a recent works, biodiesel has been sustainably produced by using SrO-ZnO/Al 2 O 3 as a bifunctional catalyst. [29,30] Other studies have explored the glass crystallization applications using these oxides, for example, BaO-SrO-ZnO-SiO 2 , [31] Eu 3þ doped SrO-ZnO-PbO-P 2 O 5 , [32] and BaO/SrO/ ZnO/SiO 2 . [33] In addition to these applications, owing to the non-toxic genesis of both oxides, they have also been used in the biological applications, i.e., ZnO and/or SrO acting as the therapeutic agents.…”