| Autor: |
Hatfield, Galen R., Li, Beili, Hammond, Willis B., Reidinger, Franz, Yamanis, John |
| Zdroj: |
Journal of Materials Science; September 1990, Vol. 25 Issue: 9 p4032-4035, 4p |
| Abstrakt: |
Lanthanum silicon nitride (LaSi3N5) powder has been prepared under the relatively mild conditions of 1400 ° C and 1 atm nitrogen. Chemical, X-ray diffraction, solid state nuclear magnetic resonance spectra and morphological information on this powder is presented. The X-ray diffraction data and previously published information have been used to develop a more complete specification of the unit cell dimensions.29Si magic-angle spinning nuclear magnetic resonance spectra of LaSi3N5 show two chemical shifts at -64.5 and -56.5 p.p.m. These shifts reflect two electronically different “types” of silicon which have been attributed to the effects of quadrupolar139La nuclei and their spatial arrangements around silicon atoms. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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