Vosegaard T, Skibsted J, Bildsøe H, Jakobsen H J
Instrument Center for Solid-State NMR Spectroscopy, Department of Chemistry, University of Aarhus, Denmark.
Solid State Nucl Magn Reson. 1999 Sep;14(3-4):203-10. doi: 10.1016/s0926-2040(99)00021-1.
Solid-state 87Rb NMR spectra for a powder and single crystal of RbVO3 have been acquired for the central transition at two magnetic field strengths (9.4 and 14.1 T) and using two single-crystal NMR probes of different design. The powder spectra have been obtained using spin-echo techniques without sample spinning because the widths of the spectra are in the range 100-150 kHz. The spectra are analyzed in terms of the chemical shielding and quadrupole coupling interactions and the parameters are compared in an evaluation of the precision for the techniques. Parameters of high precision including the relative orientation for the two tensors are obtained from the single-crystal spectra at 14.1 T. Finally, the orientations of the two tensors in the crystal frame are deduced from the crystal symmetry and an XRD analysis.
已在两种磁场强度（9.4 T和14.1 T）下，使用两种不同设计的单晶核磁共振探头，获取了RbVO₃粉末和单晶的固态⁸⁷Rb核磁共振谱的中心跃迁谱。由于谱宽在100 - 150 kHz范围内，粉末谱是使用自旋回波技术在不旋转样品的情况下获得的。根据化学屏蔽和四极耦合相互作用对谱进行分析，并在评估技术精度时比较参数。从14.1 T的单晶谱中获得了包括两个张量相对取向在内的高精度参数。最后，根据晶体对称性和X射线衍射分析推导出晶体坐标系中两个张量的取向。
