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首页> 外文期刊>Journal of the Physical Society of Japan >Intrinsic Proton NMR Studies of Mg(OH)(2) and Ca(OH)(2)
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Intrinsic Proton NMR Studies of Mg(OH)(2) and Ca(OH)(2)

机译:Mg(OH)(2)和Ca(OH)(2)的本征质子NMR研究

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摘要

We studied the short proton free induction decay signals and the broad H-1 NMR spectra of Mg(OH)(2) and Ca(OH)(2) powders at 77-355 K and 42 MHz using pulsed NMR techniques. Using a Gaussian-type back extrapolation procedure for the obscured data of the proton free induction decay signals, we obtained more precise values of the second moments of the Fourier-transformed broad NMR spectra than those in a previous report [Y. Itoh and M. Isobe, J. Phys. Soc. Jpn. 84, 113601 (2015)] and compared with the theoretical second moments. The decrease in the second moment could not account for the large decrease in the magnitude of the intrinsic proton spin -lattice relaxation rate 1/T-1 from Mg(OH)(2) to Ca(OH)(2). The analysis of 1/T-1 proportional to exp(-E-g/k(B)T) with E-g similar to 0.01 eV points to a local hopping mechanism, and that of 1/T-1 proportional to T-n with n similar to 0.5 points to an anharmonic rattling mechanism.
机译:我们使用脉冲NMR技术研究了Mg(OH)(2)和Ca(OH)(2)粉末在77-355 K和42 MHz时的短质子无感生感应衰减信号和宽H-1 NMR光谱。对于无质子感应衰减信号的模糊数据,使用高斯型反推程序,我们获得的傅里叶变换宽NMR光谱的第二矩的值比以前的报告中更精确。 Itoh和M.Isobe,《物理学报》。 Soc。日本。 84,113601(2015)]并与理论第二时刻进行了比较。第二次矩的下降不能解释从Mg(OH)(2)到Ca(OH)(2)的固有质子自旋晶格弛豫速率1 / T-1的大幅下降。与Eg近似为0.01 eV的比例与exp(-Eg / k(B)T)成正比的1 / T-1的分析是局部跳变机制,与n近似为0.5的Tn的比例与1 / T-1的分析近似指出了一种不和谐的嘎嘎声机制。

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