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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
Research Interests
  • Synchrotron Radiation Application Researches

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Pressure-Induced Amorphization of Small Pore Zeolites-the Role of Cation-H2O Topology and Anti-glass Formation

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Title
Pressure-Induced Amorphization of Small Pore Zeolites-the Role of Cation-H2O Topology and Anti-glass Formation
Author
Hwang, Gil ChanShin, Tae JooBlom, Douglas A.Vogt, ThomasLee, Yongjae
Issue Date
2015-10
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.5, pp.15056
Abstract
Systematic studies of pressure-induced amorphization of natrolites (PIA) containing monovalent extra-framework cations (EFC) Li+, Na+, K+, Rb+, Cs+ allow us to assess the role of two different EFC-H2O configurations within the pores of a zeolite: one arrangement has H2O molecules (NATI) and the other the EFC (NAT(II)) in closer proximity to the aluminosilicate framework. We show that NAT(I) materials have a lower onset pressure of PIA than the NAT(II) materials containing Rb and Cs as EFC. The onset pressure of amorphization (P-A) of NAT(II) materials increases linearly with the size of the EFC, whereas their initial bulk moduli (P-1 phase) decrease linearly. Only Cs- and Rb-NAT reveal a phase separation into a dense form (P-2 phase) under pressure. High-Angle Annular Dark Field Scanning Transmission Electron Microscopy (HAADF-STEM) imaging shows that after recovery from pressures near 25 and 20 GPa long-range ordered Rb-Rb and Cs-Cs correlations continue to be present over length scales up to 100 nm while short-range ordering of the aluminosilicate framework is significantly reduced-this opens a new way to form anti-glass structures
URI
https://scholarworks.unist.ac.kr/handle/201301/17646
URL
http://www.nature.com/articles/srep15056
DOI
10.1038/srep15056
ISSN
2045-2322
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UCRF_Journal Papers
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