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2015 ; 5
(ä): 15056
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Pressure-Induced Amorphization of Small Pore Zeolites-the Role of Cation-H2O
Topology and Anti-glass Formation
#MMPMID26455345
Chan Hwang G
; Joo Shin T
; Blom DA
; Vogt T
; Lee Y
Sci Rep
2015[Oct]; 5
(ä): 15056
PMID26455345
show ga
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 (NATII) in closer proximity to the aluminosilicate framework. We show
that NATI materials have a lower onset pressure of PIA than the NATII materials
containing Rb and Cs as EFC. The onset pressure of amorphization (PA) of NATII
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.