CP-MAS 207Pb with 19F decoupling NMR spectroscopy:: medium range investigation in fluoride materials

被引：19

作者：

Bureau, B ^{[1
]}

Silly, G ^{[1
]}

Buzaré, JY ^{[1
]}

机构：

[1] Univ Maine, UPRESA CNRS 6087, Lab Phys Etat Condense, F-72085 Le Mans 9, France

来源：

SOLID STATE NUCLEAR MAGNETIC RESONANCE | 1999年 / 15卷 / 02期

关键词：

lead fluorides; Pb-207 solid state NMR; F-19-Pb-207; CP-MAS; transition metal fluoride glasses;

D O I：

10.1016/S0926-2040(99)00030-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The isotropic chemical shift of Pb-207 is used to perform structural investigations of crystalline fluoride compounds (PbF2, Pb2ZnF6, PbGaF5, Pb3Ga2F12 and Pb9Ga2F24) and transition metal fluoride glasses (TMFG) of the PZG family (PbF2-ZnF2-GaF3), Using Pb-207 Cross Polarisation Magic Angle Spinning (CP-MAS) NMR with F-19 decoupling, it is shown that the isotropic chemical shift of Pb-207 varies on a large scale (1000 ppm) and that the main changes of its value are not due to the nearest neighbour fluorines but may be related to the number of next nearest neighbour (nnn) Pb2+ ions. In this way, it is demonstrated that Pb-207 chemical shift is an interesting probe to investigate medium range order in either crystalline or glassy fluoride systems. The Pb-207 delta(iso) parameter has been linearly correlated to the number of nnn Pb2+ ions. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：79 / 89

页数：11

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