Determination of phase composition of silicon nitride powders by silicon-29 magic angle spinning nuclear magnetic resonance spectroscopy
The use of solid-state /sup 29/Si NMR spectroscopy to analyze Si/sub 3/N/sub 4/ powders is demonstrated for a series of commercial and research samples. In particular, two different commercial powders contain 20% and 30% amorphous Si/sub 3/N/sub 4/ content, as identified by the application of methods described herein. These same materials had been analyzed by X-ray diffraction as only crystalline Si/sub 3/N/sub 4/. NMR spectroscopy is capable of distinguishing among different amorphous silicon species normally found in preparations of Si/sub 3/N/sub 4/ powders. These include amorphous Si/sub 3/N/sub 4/, silicon oxynitrides, silicates, and elemental silicon. The measurement of concentration of these species is made for correlation with properties of powder sinterability.
- Research Organization:
- Ford Motor Company, Dearborn, MI
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5419249
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:23; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
DATA
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NITRIDES
NITROGEN COMPOUNDS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
PHASE STUDIES
PNICTIDES
POWDERS
RESONANCE
SILICON 29
SILICON COMPOUNDS
SILICON ISOTOPES
SILICON NITRIDES
SPECTRA
STABLE ISOTOPES