共查询到20条相似文献，搜索用时 12 毫秒
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Xiqu Wang Lumei Liu Allan J. Jacobson 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2001,113(11):2232-2234
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(39):11926-11930
Screw dislocation structures in crystals are an origin of symmetry breaking in a wide range of dense‐phase crystals. Preparation of such analogous structures in framework‐phase crystals is of great importance in zeolites but is still a challenge. On the basis of crystal‐structure solving and model building, it was found that the two specific intergrowths in MTW zeolite produce this complex fractal and spiral structure. With the structurally determined parameters (spiral pitch h, screw angle θ, and spatial angle ψ) of Burgers circuit, the screw dislocation structure can be constructed by two different dimensional intergrowth sections. Thus the reported complexity of various dimensions in diverse crystals can be unified. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2018,130(8):2099-2102
The structure of Cs3RESi6O15, where RE=Dy–Lu, Y, In, is unusual in that it contains octahedrally coordinated rare‐earth ions; their relative orientation dictates the structure, as they rotate about the c‐axis supported by the cyclic Si6O15 framework. The repeat unit of the rotation is eight units generating a very long (ca. 57 Å) unit cell axis. This unusual repeat unit is created by the structural flexibility of the hexasilicate ring, which is in turn affected by the size of the rare earth ion as well as the size of alkali ion residing within the silicate layers. Previous work showed for the smaller Sc3+ ion, the rotation of the octahedra is not sufficient to achieve closure at an integral repeat unit and an incommensurate structure results. The products are prepared as large, high quality single crystals using a high‐temperature (650 °C) hydrothermal method with CsOH and F− mineralizers. The presence of fluoride is essential to the formation of the product. 相似文献
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Friedrich Liebau 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1999,111(12):1845-1850
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Ralf Riedel 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2002,114(14):2721-2723
Die Übersetzung basiert auf der „Terminology for Compounds in the Si‐Al‐O‐N System“ der Commission on High Temperature Materials and Solid State Chemistry der Inorganic Chemistry Division der International Union of Pure and Applied Chemistry, veröffentlicht in Pure Appl. Chem. 1999 , 71, 1765–1769. Das Original wurde von R. Metselaar, Technische Universiteit Eindhoven (Niederlande) und D. S. Yan, Academia Sinica, Shanghai (China) für die Veröffentlichung vorbereitet. 相似文献
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Wolfgang Schnick 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1999,111(22):3511-3512
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Gunnar Jeschke Martin Jansen 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1998,110(9):1342-1343
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Arno Pfitzner Eva Freudenthaler 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1995,107(15):1784-1786
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Arno Pfitzner Stefan Zimmerer 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1997,109(9):1031-1033
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