Details
| Original language | English |
|---|---|
| Pages (from-to) | 883-886 |
| Number of pages | 4 |
| Journal | Nanostructured Materials |
| Volume | 12 |
| Issue number | 5 |
| Publication status | Published - 1999 |
| Event | 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed Duration: 14 Jun 1998 → 19 Jun 1998 |
Abstract
Temperature and frequency dependent 7Li spin-lattice relaxation rate measurements on the layer-structured two-dimensional ion conductor LixTiS2 in different order states were carried out in the laboratory frame and in the rotating frame. The activation energies for individual ion hopping, as obtained from these measurements, are about 0.19eV for the polycrystalline, 0.16eV for the nanocrystalline, and 0.07eV for the amorphous material. The frequency dependence of T1-1 is sublinear for both disordered modifications. The NMR central transition lines of the nanocrystalline material decompose into a narrow and a broad component in the course of motional narrowing. The relative intensity of the narrow component corresponding to the fraction of highly mobile Li ions increases gradually with temperature, reaching a limiting value of 50% at high temperatures. Hence, we conclude that the interfacial regions are not structurally homogeneous and comprise about half of the atoms of the sample. Contrary to three-dimensional nanocrystals, diffusion in the two-dimensional nanocrystalline material takes place on the grain surfaces rather than within an amorphous interface medium.
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Nanostructured Materials, Vol. 12, No. 5, 1999, p. 883-886.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - NMR relaxation and line shape study on Li+ diffusion in nanocrystalline layer-structured LixTiS2
AU - Winter, Rudolf
AU - Heitjans, Paul
PY - 1999
Y1 - 1999
N2 - Temperature and frequency dependent 7Li spin-lattice relaxation rate measurements on the layer-structured two-dimensional ion conductor LixTiS2 in different order states were carried out in the laboratory frame and in the rotating frame. The activation energies for individual ion hopping, as obtained from these measurements, are about 0.19eV for the polycrystalline, 0.16eV for the nanocrystalline, and 0.07eV for the amorphous material. The frequency dependence of T1-1 is sublinear for both disordered modifications. The NMR central transition lines of the nanocrystalline material decompose into a narrow and a broad component in the course of motional narrowing. The relative intensity of the narrow component corresponding to the fraction of highly mobile Li ions increases gradually with temperature, reaching a limiting value of 50% at high temperatures. Hence, we conclude that the interfacial regions are not structurally homogeneous and comprise about half of the atoms of the sample. Contrary to three-dimensional nanocrystals, diffusion in the two-dimensional nanocrystalline material takes place on the grain surfaces rather than within an amorphous interface medium.
AB - Temperature and frequency dependent 7Li spin-lattice relaxation rate measurements on the layer-structured two-dimensional ion conductor LixTiS2 in different order states were carried out in the laboratory frame and in the rotating frame. The activation energies for individual ion hopping, as obtained from these measurements, are about 0.19eV for the polycrystalline, 0.16eV for the nanocrystalline, and 0.07eV for the amorphous material. The frequency dependence of T1-1 is sublinear for both disordered modifications. The NMR central transition lines of the nanocrystalline material decompose into a narrow and a broad component in the course of motional narrowing. The relative intensity of the narrow component corresponding to the fraction of highly mobile Li ions increases gradually with temperature, reaching a limiting value of 50% at high temperatures. Hence, we conclude that the interfacial regions are not structurally homogeneous and comprise about half of the atoms of the sample. Contrary to three-dimensional nanocrystals, diffusion in the two-dimensional nanocrystalline material takes place on the grain surfaces rather than within an amorphous interface medium.
UR - http://www.scopus.com/inward/record.url?scp=0032593940&partnerID=8YFLogxK
U2 - 10.1016/S0965-9773(99)00258-5
DO - 10.1016/S0965-9773(99)00258-5
M3 - Conference article
AN - SCOPUS:0032593940
VL - 12
SP - 883
EP - 886
JO - Nanostructured Materials
JF - Nanostructured Materials
SN - 0965-9773
IS - 5
T2 - 1998 4th International Conference on Nanostructured Materials (NANO '98)
Y2 - 14 June 1998 through 19 June 1998
ER -