Neutron powder diffraction study of potassium clusters in zeolite K-LTA

被引：27

作者：

Ikeda, T

Kodaira, T

Izumi, F

Kamiyama, T

Ohshima, K

机构：

[1] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan

[2] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan

[3] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 318卷 / 1-3期

关键词：

D O I：

10.1016/S0009-2614(00)00017-8

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 crystal structures of K-doped K-LTA below and above the Curie temperature of 8 K were analyzed by neutron powder diffraction on the basis of space group F23. We found alternate ordering of Si and Al in a distorted framework and different K clusters in two kinds of alpha-cages. Additional K+ ions are distributed mainly in four- and eight-membered rings of the framework and partially occupy the center of an alpha-cage. K+ ions near the center of a six-membered ring form two kinds of tetrahedral assemblies occupied statistically. Our structural data suggest that the K clusters in the adjacent alpha-cages have different magnetic moments. This is consistent with a spontaneous magnetic moment, which is observable even if the K clusters interact antiferromagnetically. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：93 / 101

页数：9