Analytical Services: Nuclear Magnetic Resonance

Michael J. Kelly, Sandia National Laboratories

General Use

- Phase analysis

- Electronic structure of metals

- Near-neighbor environment of atoms in solids

- Measures rate of kinetic processes, for example molecular reorientation or diffusion

- Magnetic structural studies

- Molecular structure of organic compounds

- Quantitative analysis of specific components and functional groups

Examples of Applications

- Detection of phase changes

- Study of hydrogen diffusion in metals

- Studies of long-range order in intermetallic compounds

- Spin wave studies in ferromagnetic materials

- Effect of pressure on electronic structure

- Isomer identification and quantification

- Determination of copolymer ratios

Samples

- Form: Inorganic powders, thin wires, or thin foils, with one dimension small compared with the radio frequency skin depth, generally 10error-file:tidyout.logm or less. Special shapes and single crystals are used in some cases. Organic solids are usually dissolved in an appropriate solvent; organic liquids can be run directly or diluted. For conventional nuclear magnetic resonance, samples must generally be nonmagnetic. For ferromagnetic nuclear resonance, samples must generally be strongly magnetic

- Size; Several grams (inorganic) to 0.1 g (organic)

Estimated Analysis Time

- 30 min to 48 h

Capabilities of Related Techniques

- Optical metallography: Shows morphology and number of phases present

- X-ray diffraction: Gives related crystal structure information

- Mössbauer effect: Provides a detectable effect in the presence of many defects

- Infrared/Fourier transform infrared spectroscopy: More sensitive for compound identification; applicable to gases; easier data interpretation

- Gas chromatography/mass spectrometry: Useful for identification of complex mixtures; more sensitive


Reprinted with permission of ASM International®.

 

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