A neutron diffraction study of alkali cation migration in montmorillonites

被引：89

作者：

Gournis, D. ^{[1
]}

Lappas, A. ^{[2
]}

Karakassides, M. A. ^{[1
]}

Toebbens, D. ^{[3
]}

Moukarika, A. ^{[4
]}

机构：

[1] Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece

[2] Fdn Res & Technol Hellas, Inst Elect Struct & Laser, Iraklion 71110, Greece

[3] Berlin Neutron Scattering Ctr, Hahn Meitner Inst, D-14109 Berlin, Germany

[4] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 2008年 / 35卷 / 01期

关键词：

montmorillonite; neutron diffraction; lithium migration; infrared reflectance; Hoffman Klemen effect;

D O I：

10.1007/s00269-007-0197-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron powder diffraction measurements on lithium and cesium saturated montmorillonite samples before and after heat treatment at 300 degrees C are studied, in order to undertake a complete refinement of crystal structure and unravel the migration mechanism for the interlayer cations of Li or Cs. Rietveld analysis of the corresponding diffraction patterns finds that montmorillonite crystallizes in the C2/m space group with unit cell dimensions consistent with the size of the specific interlayer cation. We show that thermal treatment affects the two types of samples in a different way. This is with respect to their unit cell dimensions and the migration of Li from the 2b to the 2c clay lattice site, in constrast to the Cs positioning which remains effectively unchanged.

引用

页码：49 / 58

页数：10

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