Diffusion in amorphous LiNbO3 studied by 7Li NMR — comparison with the nano- and microcrystalline material
Diffusion in amorphous LiNbO3 studied by 7Li NMR — comparison with the nano- and microcrystalline material
复制标题
DOI：
10.1039/b201193j
复制
发表时间：
2002-07
影响因子：
3.3
通讯作者：
M. Wilkening;D. Bork;S. Indris;P. Heitjans
中科院分区：
文献类型：
--
作者：
M. Wilkening;D. Bork;S. Indris;P. Heitjans
采用7 Li NMR技术研究了锂在溶胶-凝胶法合成的非晶LiNbO 3中的扩散行为。测量了7 Li自旋-晶格弛豫速率T−11和7 Li核磁共振谱，特别是中心线的线形和运动变窄。与我们早先研究的纳米和微晶铌酸锂的结果进行了比较。Li在非晶材料中的扩散率比在微晶材料中的高得多，并且可以通过与在纳米晶体LiNbO 3中几乎相同的扩散参数来描述。这表明在非晶LiNbO 3和纳米晶LiNbO 3的界面区域中的扩散路径具有相似的结构。
Lithium diffusion in amorphous LiNbO3, synthesized by a sol–gel process, was investigated by temperature- and frequency-dependent 7Li NMR experiments. 7Li spin-lattice relaxation rates T−11 and 7Li nuclear magnetic resonance spectra, in particular line shapes and motional narrowing of the central line, were measured. The results are discussed in comparison with those on nano- and microcrystalline LiNbO3 investigated by us earlier. The Li diffusivity in the amorphous material is much higher than in the microcrystalline one and can be described by practically the same diffusion parameters as in nanocrystalline LiNbO3. This suggests that the diffusion pathways in amorphous LiNbO3 and in the interfacial regions of nanocrystalline LiNbO3 have similar structures.