Pressure-Induced Amorphization of Small Pore Zeolites-the Role of Cation-H 2 O Topology and Anti-glass Formation

Gil Chan Hwang, Tae Joo Shin, Douglas A. Blom, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

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-H 2 O configurations within the pores of a zeolite: one arrangement has H 2 O molecules (NAT I) 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 (P1 phase) decrease linearly. Only Cs-and Rb-NAT reveal a phase separation into a dense form (P2 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.

Original languageEnglish
Article number15056
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Oct 12

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Zeolites
Amorphization
Cations
Topology
Glass
Phase separation
N-acetyltalosaminuronic acid
Elastic moduli
Transmission electron microscopy
Imaging techniques
Recovery
Scanning electron microscopy
Molecules

All Science Journal Classification (ASJC) codes

  • General

Cite this

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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-H 2 O configurations within the pores of a zeolite: one arrangement has H 2 O molecules (NAT I) 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 (P1 phase) decrease linearly. Only Cs-and Rb-NAT reveal a phase separation into a dense form (P2 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.",
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Pressure-Induced Amorphization of Small Pore Zeolites-the Role of Cation-H 2 O Topology and Anti-glass Formation . / Chan Hwang, Gil; Joo Shin, Tae; Blom, Douglas A.; Vogt, Thomas; Lee, Yongjae.

In: Scientific reports, Vol. 5, 15056, 12.10.2015.

Research output: Contribution to journalArticle

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