Inelastic X-ray Scattering Studies of Zeolite Amorphisation

G. N. Greaves; F. Kargl; D. Ward; P. Holliman; F. Meneau

doi:10.1063/1.3086234

Inelastic X-ray Scattering Studies of Zeolite Amorphisation

G. N. Greaves, F. Kargl, D. Ward, P. Holliman, F. Meneau

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference Proceeding (Non-Journal item)

Abstract

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 R{sub LP} 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 V{sub Molar}. The Brillouin frequency {omega}{sub Q} also decreases with amorphisation in a similar fashion, signifying a non-uniform decrease in the speed of sound v{sub l}. 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¸2009 American Institute of Physics

Original language	English
Title of host publication	AIP Conf. Proc. 1092
Editors	R. Magalhaes-Paniago
Publisher	American Institute of Physics
Pages	51-54
Number of pages	4
ISBN (Print)	978-0-7354-0625-4
DOIs	https://doi.org/10.1063/1.3086234
Publication status	Published - 29 Jan 2009

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title = "Inelastic X-ray Scattering Studies of Zeolite Amorphisation",

abstract = "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 R{sub LP} 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 V{sub Molar}. The Brillouin frequency {omega}{sub Q} also decreases with amorphisation in a similar fashion, signifying a non-uniform decrease in the speed of sound v{sub l}. 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¸2009 American Institute of Physics",

author = "Greaves, {G. N.} and F. Kargl and D. Ward and P. Holliman and F. Meneau",

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T1 - Inelastic X-ray Scattering Studies of Zeolite Amorphisation

AU - Greaves, G. N.

AU - Kargl, F.

AU - Ward, D.

AU - Holliman, P.

AU - Meneau, F.

PY - 2009/1/29

Y1 - 2009/1/29

N2 - 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 R{sub LP} 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 V{sub Molar}. The Brillouin frequency {omega}{sub Q} also decreases with amorphisation in a similar fashion, signifying a non-uniform decrease in the speed of sound v{sub l}. 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¸2009 American Institute of Physics

AB - 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 R{sub LP} 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 V{sub Molar}. The Brillouin frequency {omega}{sub Q} also decreases with amorphisation in a similar fashion, signifying a non-uniform decrease in the speed of sound v{sub l}. 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¸2009 American Institute of Physics

UR - http://hdl.handle.net/2160/9584

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BT - AIP Conf. Proc. 1092

A2 - Magalhaes-Paniago, R.

PB - American Institute of Physics

ER -

Inelastic X-ray Scattering Studies of Zeolite Amorphisation

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