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

共 36 条

[21] FTIR spectroscopic characterization of thermally treated Cu2+, Cd2+, and Li+ montmorillonites
Madejová, J
Arvaiová, B
Komadel, P
[J]. SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 1999, 55 (12) : 2467 - 2476
[22] Behaviour of Li+ and Cu2+ in heated montmorillonite:: Evidence from far-, mid-, and near-IR regions
Madejová, J
Pálková, H
Komadel, P
[J]. VIBRATIONAL SPECTROSCOPY, 2006, 40 (01) : 80 - 88
[23] Clay mineralogical investigations related to nuclear waste disposal
Madsen, FT
[J]. CLAY MINERALS, 1998, 33 (01) : 109 - 129
[24] Mering J, 1946, T FARADAY SOC B, V42B, P205
[25] INTERCALATED CLAY CATALYSTS
PINNAVAIA, TJ
[J]. SCIENCE, 1983, 220 (4595) : 365 - 371
[26] The hydration structure of the Ni2+ ion intercalated in montmorillonite clay:: a neutron diffraction with isotopic substitution study
Pitteloud, C
Powell, DH
Fischer, HE
[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2001, 3 (24) : 5567 - 5574
[27] The structure of interlayer water in Li-montmorillonite studied by neutron diffraction with isotopic substitution
Powell, DH
Fischer, HE
Skipper, NT
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (52): : 10899 - 10905
[28] Interlayer water structure in Na- and Li-montmorillonite clays
Powell, DH
Tongkhao, K
Kennedy, SJ
Slade, PG
[J]. PHYSICA B, 1997, 241 : 387 - 389
[29] A PROFILE REFINEMENT METHOD FOR NUCLEAR AND MAGNETIC STRUCTURES
RIETVELD, HM
[J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1969, 2 : 65 - &
[30] RECENT ADVANCES IN MAGNETIC-STRUCTURE DETERMINATION BY NEUTRON POWDER DIFFRACTION
RODRIGUEZCARVAJAL, J
[J]. PHYSICA B, 1993, 192 (1-2): : 55 - 69

← 1 2 3 4 →