Nuclear magnetic resonance studies of atomic motion in lithium chloroborate and lithium thiosilicate glassy fast ionic conductors

Technical Report · Tue May 14 00:00:00 EDT 1991

OSTI ID:5809270

Trunnell, M

The NMR spectra and T{sub 1} measurements on both the stationary {sup 11}B in the lithium chloroborate glass and on the mobile {sup 7}Li in both the lithium chloroborate and lithium thiosilicate glasses have yielded much useful information about the static and dynamic properties of these two glassy fast ionic conductors. The {sup 11}B spectra for the B{sub 2}O{sub 3} + 0.7Li{sub 2}O + XLiCl glasses indicates that the boron nuclei sit in two different sites. The narrow central line is due to the {sup 11}B nuclei that are in the BO{sub 4} sites where there is no EFG and therefore no electric quadrupole effects and no splitting of the line. The broader pattern consisting of the two side peaks is a result of the {sup 11}B nuclei that sit in the BO{sub 3} sites. In these sites, the magnitude of the EFG tenser is large and second order splitting of the central transition is seen. These side peaks are smaller since they are due to essentially the same number of boron nuclei but the pattern is spread over a much larger range of frequencies. If a baseline for these spectra could be determined, the ratio of BO{sub 3} to BO{sub 4} could then be found. Nuclear spin lattice relaxation measurements of the {sup 11}B nuclei show no dependence on the measuring frequency. Because of this, the theory proposed by Rubinstein and Resing which uses an adaptation of the Van Kronendonk theory and uses a two phonon Raman process for the relaxation is favored. Spin lattice relaxation measurements of the {sup 7}Li nuclei do show the frequency dependence that one expects from the nuclei that are free to diffuse through the glass matrix. 29 figs., 9 tabs.

• Research Organization: Ames Lab., IA (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5809270
• Report Number(s): IS-T-1525; ON: DE91012677
• Resource Relation: Other Information: Thesis (M.S.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GLASS
NUCLEAR MAGNETIC RESONANCE
BORATES
BORON 11
CHLORINE COMPOUNDS
LATTICE VIBRATIONS
LITHIUM COMPOUNDS
LITHIUM SILICATES
SPIN-LATTICE RELAXATION
ALKALI METAL COMPOUNDS
BORON COMPOUNDS
BORON ISOTOPES
HALOGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
RELAXATION
RESONANCE
SILICATES
SILICON COMPOUNDS
STABLE ISOTOPES
360603* - Materials- Properties