Rational Design of Materials with Extreme Negative Compressibility: Selective Soft-Mode Frustration in KMn[Ag(CN)2]3

被引：134

作者：

Cairns, Andrew B. ^{[1
]}

Thompson, Amber L. ^{[1
]}

Tucker, Matthew G. ^{[2
]}

Haines, Julien ^{[3
]}

Goodwin, Andrew L. ^{[1
]}

机构：

[1] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England

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

[3] Univ Montpellier 2, Inst Charles Gerhardt, UMR CNRS 5253, F-34095 Montpellier 05, France

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

THERMAL-EXPANSION; CRYSTAL-STRUCTURE;

D O I：

10.1021/ja204908m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We show that lain [Ag(CN)(2)](3) exhibits the strongest negative linear compressibility (NLC) effect over the largest pressure range yet observed. Variable pressure neutron powder diffraction measurements reveal that its crystal lattice expands along the c axis of its trigonal cell under increasing hydrostatic pressure, while contracting along the a axis. This corresponds to a "wine-rack"-like mechanism for NLC that we find also results in anisotropic negative thermal expansion (NTE) in the same material. Inclusion of extra-framework K+ counterions has minimal effect on framework flexibility (and hence the magnitude of NTE/NLC) but selectively frustrates the soft phonon modes responsible for destroying NLC in the related material Ag-3[Co(CN)(6)].

引用

页码：4454 / 4456

页数：3

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