用旋转框架中的 1H 自旋晶格弛豫研究 [(NH4)1-xRbx]3H(SO4)2 室温相中的质子扩散。
Proton diffusion in the room-temperature phase of [(NH4)1-xRbx]3H(SO4)2 as studied by 1H spin-lattice relaxation in the rotating frame.
机构信息
Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
出版信息
Solid State Nucl Magn Reson. 2010 May-Jun;37(3-4):69-74. doi: 10.1016/j.ssnmr.2010.05.002.
Proton diffusion in the room-temperature phase (phase II) of [(NH4)1-xRbx]3H(SO4)2 (0<or=x<or=1) has been studied by means of 1H spin-lattice relaxation times in the rotating frame, T1rho. The 1H T1rho values were measured at 200.13 MHz in the range of 380-490 K. The ammonium protons and the acidic protons have independent T1rho values in the higher temperature range of phase II, suggesting that the spin diffusion between the two species is ineffective. The translational diffusion of the acidic protons is the most dominant mechanism to relax both the ammonium protons and the acidic protons in phase II. The 1H T1rho values in phase II are analyzed theoretically and the motional parameters are obtained. The results of NMR well explain the macroscopic proton conductivity.
通过在旋转框架中的 1H 自旋晶格弛豫时间 T1rho，研究了[(NH4)1-xRbx]3H(SO4)2（0<or=x<or=1）室温相（相 II）中的质子扩散。在 200.13 MHz 下，在 380-490 K 的范围内测量了 1H T1rho 值。在相 II 的较高温度范围内，铵质子和酸性质子具有独立的 T1rho 值，表明两种物质之间的自旋扩散无效。酸性质子的平移扩散是弛豫铵质子和酸性质子的最主要机制在相 II 中。相 II 中的 1H T1rho 值进行了理论分析，并得到了运动参数。NMR 的结果很好地解释了宏观质子电导率。
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