F-19 NMR-STUDY OF SINGLE-CRYSTALS OF NEODYMIUM TRIFLUORIDE AND PRAESODYMIUM TRIFLUORIDE

被引：4

作者：

REUVENI, A ^{[1
]}

MCGARVEY, BR ^{[1
]}

机构：

[1] UNIV WINDSOR,DEPT CHEM,WINDSOR N9B 3P4,ONTARIO,CANADA

来源：

JOURNAL OF MAGNETIC RESONANCE | 1979年 / 36卷 / 01期

关键词：

D O I：

10.1016/0022-2364(79)90211-7

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

A fluorine-19 NMR study of single crystals of NdF3 and PrF3 is reported. The shift tensors are determined, at 97 K for NdF3 and 103 K for PrF3, for the three types of fluorine in the trigonal unit cell. Point-dipole interaction accounts for only 45% of the traceless part of the shift tensors, the rest being a contribution from two spin-transfer mechanisms: a covalent and a spin-polarization mechanism. Expressions are derived and used to estimate the contributions from both. The lowest-symmetry fluorines undergo diffusional motion in the range 280 to 360 K for NdF3 with an activation energy of 26.5 kJ/mole and in the range 240 to 300 K for PrF3 with an activation energy of 4.8 kJ/mole. This diffusion is discussed and compared with similar behavior in other lanthanide fluorides. © 1979.

引用

页码：7 / 19

页数：13

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