Details
| Original language | English |
|---|---|
| Article number | 104301 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 72 |
| Issue number | 10 |
| Publication status | Published - 1 Sept 2005 |
Abstract
Nuclear magnetic resonance spectroscopy was used to study polycrystalline β-spodumene (β-LiAlSi2O6) as well as glassy specimens with the same chemical composition. Li7 spin-lattice relaxation measurements were carried out in a broad temperature range and for several Larmor frequencies. In addition to a pronounced rate maximum at high temperatures, stemming from the long-range Li motion in these aluminosilicates, we found a weak maximum in the crystalline modification near 120K. The latter result confirms the existence of a local double-well structure in which the Li ions reside. The ionic motion was also monitored by solid- and stimulated-echo spectra as well as by the decay of the Jeener-Broekaert echo. Under conditions which are discussed in detail, the latter is a direct measure of the hopping correlation function. For the glass this function was found to decay faster and more stretched than that of the crystal at a given temperature. Furthermore, the relevant barriers against the high-temperature long-range Li motion are larger in the crystal as compared to the glass.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 10, 104301, 01.09.2005.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ion hopping in crystalline and glassy spodumene LiAlSi2O6
T2 - Li7 spin-lattice relaxation and Li7 echo NMR spectroscopy
AU - Qi, F.
AU - Rier, C.
AU - Böhmer, R.
AU - Franke, W.
AU - Heitjans, P.
PY - 2005/9/1
Y1 - 2005/9/1
N2 - Nuclear magnetic resonance spectroscopy was used to study polycrystalline β-spodumene (β-LiAlSi2O6) as well as glassy specimens with the same chemical composition. Li7 spin-lattice relaxation measurements were carried out in a broad temperature range and for several Larmor frequencies. In addition to a pronounced rate maximum at high temperatures, stemming from the long-range Li motion in these aluminosilicates, we found a weak maximum in the crystalline modification near 120K. The latter result confirms the existence of a local double-well structure in which the Li ions reside. The ionic motion was also monitored by solid- and stimulated-echo spectra as well as by the decay of the Jeener-Broekaert echo. Under conditions which are discussed in detail, the latter is a direct measure of the hopping correlation function. For the glass this function was found to decay faster and more stretched than that of the crystal at a given temperature. Furthermore, the relevant barriers against the high-temperature long-range Li motion are larger in the crystal as compared to the glass.
AB - Nuclear magnetic resonance spectroscopy was used to study polycrystalline β-spodumene (β-LiAlSi2O6) as well as glassy specimens with the same chemical composition. Li7 spin-lattice relaxation measurements were carried out in a broad temperature range and for several Larmor frequencies. In addition to a pronounced rate maximum at high temperatures, stemming from the long-range Li motion in these aluminosilicates, we found a weak maximum in the crystalline modification near 120K. The latter result confirms the existence of a local double-well structure in which the Li ions reside. The ionic motion was also monitored by solid- and stimulated-echo spectra as well as by the decay of the Jeener-Broekaert echo. Under conditions which are discussed in detail, the latter is a direct measure of the hopping correlation function. For the glass this function was found to decay faster and more stretched than that of the crystal at a given temperature. Furthermore, the relevant barriers against the high-temperature long-range Li motion are larger in the crystal as compared to the glass.
UR - http://www.scopus.com/inward/record.url?scp=29744434747&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.72.104301
DO - 10.1103/PhysRevB.72.104301
M3 - Article
AN - SCOPUS:29744434747
VL - 72
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 10
M1 - 104301
ER -