Universal thermal response of the Prussian blue lattice

被引：68

作者：

Matsuda, T. ^{[1
]}

Kim, J. E. ^{[1
,2
]}

Ohoyama, K. ^{[1
,3
]}

Moritomo, Y. ^{[1
]}

机构：

[1] Univ Tsukuba, Dept Phys, Tsukuba, Ibaraki 3058571, Japan

[2] JASRI SPring 8, Sayo, Hyogo 6795198, Japan

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 17期

关键词：

organic compounds; stability; thermal expansion; X-ray diffraction; CHARGE-TRANSFER; EXPANSION; ZRW2O8; ANALOG; DIFFRACTION; TRANSITION;

D O I：

10.1103/PhysRevB.79.172302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermal responses of Prussian blue lattice, that is, a rocksalt-type network of metal ions bridged by cyano group, are systematically investigated for (Cs,Rb)(x)M-II[Fe-III(CN)(6)](y)zH(2)O (M=Ni, Cu, Zn, and Cd) and (Cs,Rb)(x)M-III[Fe-II(CN)(6)](y)zH(2)O (M=Fe and Co) by means of the synchrotron-radiation x-ray powder diffraction. We found a universal relation between the coefficient (beta equivalent to d ln a/dT; a is lattice constant) of the thermal expansion and magnitude of a: beta changes the sign from positive to negative with increase in a. We ascribed the negative thermal expansion observed in the large-a region to intrinsic rotational instability of the [Fe(CN)(6)] unit.

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页数：4

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