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The Route to the Structure Determination of Amorphous Solids: A Case Study of the Ceramic Si 3 B 3 N 7
Author(s) -
Jansen Martin,
Schön J. Christian,
van Wüllen Leo
Publication year - 2006
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200504193
Subject(s) - amorphous solid , ceramic , boron , materials science , covalent bond , stoichiometry , polyamorphism , carbon fibers , silicon , quartz , crystallography , mineralogy , chemistry , composite number , organic chemistry , metallurgy , composite material
Si 3 B 3 N 7 is the parent compound of a new class of amorphous ceramics containing silicon, boron, nitrogen, and carbon that display a unique spectrum of properties. It consists of a random network in which the constituent elements are linked by predominantly covalent bonds. Similarly to quartz glass, the composition of amorphous Si 3 B 3 N 7 is virtually stoichiometric. As all three of its constituent elements can serve as the objects of various structural probes, Si 3 B 3 N 7 was selected as the basis of a systematic structural investigation, in which methods for the structure determination of solids without translational symmetry could be validated and improved. However, as the complete amorphous structure cannot be deduced from experimental data, these results must be complemented by computer simulations. Thus, five classes of structure models were generated and compared to experimental results. Only the models generated by following the actual synthesis route as closely as possible agreed well with the experimental data.