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Fine Structures of Zeolite-Linde-L (LTL): Surface Structures, Growth Unit and Defects

Authors

  • Tetsu Ohsuna Dr.,

    1. Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
    2. Present address: Structural Chemistry, Arrehenius Laboratory, Stockholm University, 10691 Stockholm, Sweden, Fax: (+46) 816-3118
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  • Ben Slater Dr.,

    1. Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, W1S 4BS, UK, Fax: (+44) 207-629-3569
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  • Feifei Gao Dr.,

    1. State Key Laboratory of Inorganic and Preparative Chemistry, Jilin University, Changchun 130023, P.R. China
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  • Jihong Yu Prof.,

    1. State Key Laboratory of Inorganic and Preparative Chemistry, Jilin University, Changchun 130023, P.R. China
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  • Yasahiro Sakamoto Dr.,

    1. Present address: Structural Chemistry, Arrehenius Laboratory, Stockholm University, 10691 Stockholm, Sweden, Fax: (+46) 816-3118
    2. Department of Physics, Tohoku University, Sendai 980–8578, Japan
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  • Gaugshan Zhu Prof.,

    1. State Key Laboratory of Inorganic and Preparative Chemistry, Jilin University, Changchun 130023, P.R. China
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  • Osamu Terasaki Prof.,

    1. Present address: Structural Chemistry, Arrehenius Laboratory, Stockholm University, 10691 Stockholm, Sweden, Fax: (+46) 816-3118
    2. Department of Physics, Tohoku University, Sendai 980–8578, Japan
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  • David E. W. Vaughan Prof.,

    1. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
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  • Shilun Qiu Prof.,

    1. State Key Laboratory of Inorganic and Preparative Chemistry, Jilin University, Changchun 130023, P.R. China
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  • C. Richard A. Catlow Prof.

    1. Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London, W1S 4BS, UK, Fax: (+44) 207-629-3569
    2. Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, UK
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Abstract

High-resolution electron microscopy (HREM) has been used to image the surface structure of nano- and micrometer-sized synthetic crystals of zeolite-Linde-L (LTL). Columnar holes and rotational, nano-sized, wheel-like defects were observed within the crystals, where the hole has a minimum size equal to that of the rotational defect. Predictions of surface structure from atomistic computer simulation concur with the observations from HREM and provide insight into the crystal growth mechanism of perfect and defective LTL. Analysis of the energetics of the formation of rotational defect structures reveals that the driving force for defect creation is thermodynamic and furthermore, the rotational defects could be created in high concentrations. Formation of a columnar hole is found to be slightly energetically unfavourable and therefore we speculate that the incidence of both rotational and nano-sized vacancy defects is strongly dependent on kinetic factors and reaction conditions. The morphology of nano- and microcrystalline LTL is contradistinct and we use insights from simulation to propose an explanation of the disparity in crystal shape.

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