Negative Thermal Expansion in LnCo(CN)6 (Ln=La, Pr, Sm, Ho, Lu, Y): Mechanisms and Compositional Trends

被引：90

作者：

Duyker, Samuel G. ^{[1
,2
]}

Peterson, Vanessa K. ^{[2
]}

Kearley, Gordon J. ^{[2
]}

Ramirez-Cuesta, Anibal J. ^{[3
]}

Kepert, Cameron J. ^{[1
]}

机构：

[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia

[2] Australian Nucl Sci & Technol Org, Kirrawee Dc, NSW 2232, Australia

[3] Rutherford Appleton Lab, ISIS, Didcot, Oxon, England

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2013年 / 52卷 / 20期

基金：

澳大利亚研究理事会;

关键词：

coordination frameworks; inelastic neutron scattering; lanthanoids; metal cyanides; rigid unit mode; NANOPOROUS COORDINATION FRAMEWORK; ZRW2O8; CONTRACTION; ZN(CN)(2); ZN; CD;

D O I：

10.1002/anie.201300619

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

RUM with a twist: The magnitude of negative thermal expansion (NTE) in the LnCo(CN)6 coordination frameworks increases with Ln ion radius r Ln. The framework structure contains an unusual locally unstable trigonal prismatic LnN6 unit that participates in an NTE-contributing vibrational mode by twisting about its axis at low energies. This contrasts with the rigid unit modes (RUMs) prevalent in other systems. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：5266 / 5270

页数：5

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