High-Pressure Raman Spectroscopy of Transition Metal Cyanides

被引：5

作者：

Moritomo, Yutaka ^{[1
]}

Matsuda, Tomoyuki ^{[1
]}

Fuchikawa, Ryota ^{[1
]}

Abe, Yuta ^{[1
]}

Kamioka, Hayato ^{[2
]}

机构：

[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan

[2] Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci TIMS, Tsukuba, Ibaraki 3058571, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2011年 / 80卷 / 02期

关键词：

transition metal cyanide; high-pressure Raman spectroscopy; negative thermal expansion; NEGATIVE THERMAL-EXPANSION; PRUSSIAN BLUE ANALOGS; ZRW2O8; DIFFRACTION;

D O I：

10.1143/JPSJ.80.024603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Prussian blue lattice is known to show characteristic thermal response; the coefficient (beta equivalent to da/dT; a is lattice constant) of the thermal expansion changes its sign from positive to negative with increasing a. In order to comprehend the curious thermal response, we systematically investigated the pressure response of the lattice for A(x)M(2+)[Fe3+(CN)(6)](y)zH(2)O (A = Rb and Cs, M = Ni, Zn, and Cd) by means of high-pressure Raman spectroscopy. We found that pressure coefficients (alpha equivalent to d (h) over bar omega/dP) of the Raman shift ((h) over bar omega) for the CN stretching modes are small in the M = Cd compounds. The small-alpha is interpreted in terms of the dynamical rotational displacement of the Fe(CN)(6) octahedra in the large-a region.

引用

页数：5

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