11B and 10B MAS NMR studies of distorted tetrahedral coordination of wurtzite boron nitride
| Autor: | Shojiro Komatsu, Masataka Tansho, Yoshiki Shimizu, Y. Moriyoshi |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
Magic angle Carbon-13 NMR satellite Mechanical Engineering chemistry.chemical_element General Chemistry Isotopes of boron Nitride Tetrahedral symmetry Electronic Optical and Magnetic Materials Crystallography chemistry.chemical_compound chemistry Boron nitride Materials Chemistry Electrical and Electronic Engineering Boron Wurtzite crystal structure |
| Zdroj: | Diamond and Related Materials. 12:1169-1172 |
| ISSN: | 0925-9635 |
| Popis: | Magic-angle spinning nuclear magnetic resonance of 11 B and 10 B ( 11 B and 10 B MAS NMR) spectroscopy has been conducted to characterize distorted chemical bonds of wurtzite boron nitride (wBN), in which boron atoms are coordinated by four nitrogen atoms. Although X-ray analysis gives the difference from ideal tetrahedral symmetry by simulation, comparison of results of MAS NMR measurements gives proof of anisotropic symmetry. Anisotropy was typically revealed in the broadened linewidth of the 10 B MAS NMR spectrum. In contrast, defective density and impurities in wBN must not be very high, since a small broadening of the linewidth in 11 B MAS NMR spectrum was revealed. These situations contrast with results of 11 B and 10 B MAS NMR measurements of cubic boron nitride (cBN) films prepared by plasma chemical vapor deposition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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