Colossal positive and negative thermal expansion in the framework material Ag3[Co(CN)6]

被引：594

作者：

Goodwin, Andrew L. ^{[1
]}

Calleja, Mark ^{[2
]}

Conterio, Michael J. ^{[1
]}

Dove, Martin T. ^{[1
]}

Evans, John S. O. ^{[3
]}

Keen, David A. ^{[4
,5
]}

Peters, Lars ^{[3
]}

Tucker, Matthew G. ^{[4
]}

机构：

[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

[2] Cambridge eSci Ctr, Cambridge CB3 0WA, England

[3] Univ Durham, Dept Chem, Univ Sci Labs, Durham DH1 3LE, England

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[5] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

来源：

SCIENCE | 2008年 / 319卷 / 5864期

基金：

英国自然环境研究理事会; 英国工程与自然科学研究理事会;

关键词：

D O I：

10.1126/science.1151442

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We show that silver( I) hexacyanocobaltate(III), Ag-3[Co(CN)(6)], exhibits positive and negative thermal expansion an order of magnitude greater than that seen in other crystalline materials. This framework material expands along one set of directions at a rate comparable to the most weakly bound solids known. By flexing like lattice fencing, the framework couples this to a contraction along a perpendicular direction. This gives negative thermal expansion that is 14 times larger than in ZrW2O8. Density functional theory calculations quantify both the low energy associated with this flexibility and the role of argentophilic (Ag+...Ag+) interactions. This study illustrates how the mechanical properties of a van der Waals solid might be engineered into a rigid, useable framework.

引用

页码：794 / 797

页数：4

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