Compositional design for SrTiO3 crystal precipitation from spinodal-type borosilicate glass containing large amounts of TiO2

K Hattori and M Shimizu and Y Daiko, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 131, 313-319 (2023).

DOI: 10.2109/jcersj2.23010

B2O-SiO2 borosilicate glasses in a specific composition range show a spinodal-type phase separation by heat -treatment at around those glass transition temperatures, and porous glasses or porous glass-ceramics can be easily obtained via an acid treatment after the phase separation. We have studied preparation conditions of SrTiO3-precipitated porous glass- ceramics for a photocatalyst of hydrogen generation using solar energy. It was found that the SrTiO3 crystal was observed for a SrO-BaO- TiO2-SiO2 glass, while the SrTiO3 crystal disap-peared from SrO- TiO2-B2O3-SiO2 glasses, which contain the B2O3 component necessary for the phase separa-tion. For this problem, we found that co-doping of K2O and Al2O3 components is effective, and a SrTiO3 con-taining porous glass-ceramic was successfully obtained by the co-doping. Molecular dynamics (MD) simulations were performed to understand the migration of Sr2+ ions in SrO-TiO2-B2O3-SiO2 glasses with K2O and Al2O3 components. This paper is the first to describe the dynamics of alkali metal/alkaline earth metal ions in those glasses and the mechanism of SrTiO3 precipitation in borosilicate glasses. & COPY;2023 The Ceramic Society of Japan. All rights reserved.

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