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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Unraveling the Origin of Structural Disorder in High Temperature Transition Al2O3: Structure of θ-Al2O3

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dc.contributor.author Kovarik, Libor ko
dc.contributor.author Bowden, Mark ko
dc.contributor.author Shi, Dachuan ko
dc.contributor.author Washton, Nancy M. ko
dc.contributor.author Andersen, Amity ko
dc.contributor.author Hu, Jian Zhi ko
dc.contributor.author Lee, Jaekyoung ko
dc.contributor.author Szanyi, Janos ko
dc.contributor.author Kwak, Jahun ko
dc.contributor.author Peden, Charles H. F. ko
dc.date.available 2015-11-20T06:36:27Z -
dc.date.created 2015-11-20 ko
dc.date.issued 2015-10 ko
dc.identifier.citation CHEMISTRY OF MATERIALS, v.27, no.20, pp.7042 - 7049 ko
dc.identifier.issn 0897-4756 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/17843 -
dc.description.abstract The crystallography of transition Al2O3 has been extensively studied in the past, because of the advantageous properties of the oxide in catalytic and a range of other technological applications. However, existing crystallographic models are insufficient to describe the structure of many important Al2O3 polymorphs, because of their highly disordered nature. In this work, we investigate structure and disorder in high-temperature-treated transition Al2O3 and provide a structural description for θ-Al2O3 by using a suite of complementary imaging, spectroscopy, and quantum calculation techniques. Contrary to current understanding, our high-resolution imaging shows that θ-Al2O3 is a disordered composite phase of at least two different end-members. By correlating imaging and spectroscopy results with density functional theory (DFT) calculations, we propose a model that describes θ-Al2O3 as a disordered intergrowth of two crystallographic variants at the unit-cell level. One variant is based on β-Ga2O3, and the other on a monoclinic phase that is closely related to δ-Al2O3. The overall findings and interpretations afford new insight into the origin of poor crystallinity in transition Al2O3, and we also provide new perspectives on structural complexity that can emerge from intergrowth of closely related structural polymorphs. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Unraveling the Origin of Structural Disorder in High Temperature Transition Al2O3: Structure of θ-Al2O3 ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84945321616 ko
dc.identifier.wosid 000363915000017 ko
dc.type.rims ART ko
dc.description.wostc 0 *
dc.description.scopustc 0 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-27 *
dc.identifier.doi 10.1021/acs.chemmater.5b02523 ko
dc.identifier.url http://pubs.acs.org/doi/10.1021/acs.chemmater.5b02523 ko
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