Inelastic X-ray Scattering Studies of Zeolite Collapse

In situ inelastic x-ray scattering (IXS) experiments have been used to probe heterogeneity and deformability in zeolte Y as this thermally collapses to a high density amorphous (HDA) aluminosilicate phase. The Landau-Placzek ratio RLP falls slowly as amorphisation advances, increasing in the later s...

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Bibliographic Details
Main Authors: Greaves, G Neville, Kargl, Florian, Ward, David, Holliman, Peter, Meneau, Florian
Format: Conference Proceeding
Language:English
Subjects:
AMORPHOUS STATE
DEFORMATION
ENTROPY
GLASS
INELASTIC SCATTERING
LAMINAR FLOW
MATERIALS SCIENCE
MECHANICAL PROPERTIES
SOUND WAVES
SYNCHROTRON RADIATION
X-RAY DIFFRACTION
ZEOLITES
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Summary:In situ inelastic x-ray scattering (IXS) experiments have been used to probe heterogeneity and deformability in zeolte Y as this thermally collapses to a high density amorphous (HDA) aluminosilicate phase. The Landau-Placzek ratio RLP falls slowly as amorphisation advances, increasing in the later stages of collapse clearly showing how homogeneity improves non-linearly-behaviour linked closely with the decline in molar volume VMolar. The Brillouin frequency oQ also decreases with amorphisation in a similar fashion, signifying a non-uniform decrease in the speed of sound vl. All of these changes with zeolite amorphisation infer formation of an intermediate low density amorphous (LDA) phase. This low entropy or 'perfect glass' has mechanical properties which are closer to the zeolite rather to the HDA glass-notably a very small value of Poisson's Ratio signifying unusually low resistance to deformation.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3086234