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Issue 38, 2013
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Systematic investigation of the mechanical properties of pure silica zeolites: stiffness, anisotropy, and negative linear compressibility

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Abstract

While the energetic stability of the large number of possible SiO2 polymorphs has been widely addressed by both experimental and theoretical studies, there is a real dearth of information on their mechanical properties. We performed a systematic study of the elastic properties of 121 pure silica zeolites, including both experimentally synthesized and hypothetical structures, by means of density-functional theory calculations. We found that most frameworks exhibit high elastic anisotropy, and the experimentally synthesized structures are among the most mechanically stable ones. We propose to extend the “feasibility” criterion proposed in earlier literature to include elastic anisotropy, allowing to further reduce the number of possible targets for synthesis of SiO2 polymorphs. We also predict that a small number of hypothetical pure silica zeolites present large negative linear compressibility (NLC), which we link to the wine-rack motif of their framework.

Graphical abstract: Systematic investigation of the mechanical properties of pure silica zeolites: stiffness, anisotropy, and negative linear compressibility

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Publication details

The article was received on 29 Apr 2013, accepted on 24 Jul 2013 and first published on 31 Jul 2013


Article type: Paper
DOI: 10.1039/C3CP51817E
Citation: Phys. Chem. Chem. Phys., 2013,15, 16012-16018
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    Systematic investigation of the mechanical properties of pure silica zeolites: stiffness, anisotropy, and negative linear compressibility

    F. Coudert, Phys. Chem. Chem. Phys., 2013, 15, 16012
    DOI: 10.1039/C3CP51817E

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