Homogeneity of doping with paramagnetic ions by NMR.
Homogeneity of doping with paramagnetic ions by NMR.
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通过 NMR 观察顺磁性离子掺杂的均匀性
DOI:
10.1039/c5cp07606d
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
J. Schmedt auf der Günne
中科院分区:
文献类型:
--
作者:
V. R. Celinski;J. Weber;N. Kunkel;H. Kohlmann;J. Schmedt auf der Günne
In NMR, paramagnetic dopants change the relaxation behavior and the chemical shift of the nuclei in their immediate environment. Based on the concept that the “immediate environment” in a diamagnetic host material can be described as a sphere with radius r0, we developed a function for the fraction of unperturbed nuclei (the fraction of nuclei outside the sphere) which gives a link between the effective radius and the doping concentration. In the case of a homogeneous doping scenario a characteristic dependence is observed in both theory and experiment. We validated the model on a sample series where paramagnetic Eu(II) ions are doped into crystalline SrH2. The fraction of unperturbed nuclei was determined from the 1H NMR signal and follows the predicted curve for a homogeneous doping scenario where the radius r0 is 17 Å.
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DOI:
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发表时间:
2019
期刊:
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作者:
森川響二朗;竹内智章;北森武彦;西川浩矢
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