Siliceous zeolite-derived topology of amorphous silica

Hirokazu Masai; Shinji Kohara; Toru Wakihara; Yuki Shibazaki; Yohei Onodera; Atsunobu Masuno; Sohei Sukenaga; Koji Ohara; Yuki Sakai; Julien Haines; Claire Levelut; Philippe Hébert; Aude Isambert; David A. Keen; Masaki Azuma

doi:10.1038/s42004-023-01075-1

Journal article Siliceous zeolite-derived topology of amorphous silica

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Hirokazu Masai, Shinji Kohara, Toru Wakihara, Yuki Shibazaki, Yohei Onodera, Atsunobu Masuno, Sohei Sukenaga, Koji Ohara, Yuki Sakai, Julien Haines, Claire Levelut, Philippe Hébert, Aude Isambert, David A. Keen, Masaki Azuma. Siliceous zeolite-derived topology of amorphous silica. Communications Chemistry. 2023, 6 (), 269. https://doi.org/10.1038/s42004-023-01075-1

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The topology of amorphous materials is an important topic from the perspective of structural ordering. Compression, one of the sintering processes of solid-state materials, can induce material densification. Here, we have confirmed for the first time that densified amorphous SiO2 fabricated by cold compression of siliceous zeolite is permanently densified while densified glassy SiO2 fabricated by cold compression of glassy SiO2 is not, although the X-ray diffraction data and the density of the former is identical to those of the latter. Moreover, we found that the topology of densified amorphous SiO2 fabricated from siliceous zeolite remains that of crystalline siliceous zeolite, while the relaxation to pristine glassy SiO2 is observed for densified glassy SiO2 after thermal annealing. These results indicate that densified siliceous zeolites retain their crystalline topology, even in the amorphous state, and that it is possible to design new functional amorphous materials by tuning of the topology.

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