High-Pressure Raman Spectroscopy of Transition Metal Cyanides
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概要
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The Prussian blue lattice is known to show characteristic thermal response; the coefficient (\beta\equiv\mathrm{d}a/\mathrm{d}T; 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]yzH2O (A = \text{Rb} and Cs, M = \text{Ni}, Zn, and Cd) by means of high-pressure Raman spectroscopy. We found that pressure coefficients (\alpha\equiv\mathrm{d}\hbar\omega/\mathrm{d}P) of the Raman shift (\hbar\omega) for the CN stretching modes are small in the M = \text{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.
- 2011-02-15
著者
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Moritomo Yutaka
Graduate School Of Pure And Applied Science University Of Tsukuba
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Abe Yuta
Graduate School Of Information Production And Systems Waseda University
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Matsuda Tomoyuki
Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Abe Yuta
Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Fuchikawa Ryota
Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Kamioka Hayato
Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Kamioka Hayato
Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, Tsukuba, Ibaraki 305-8571
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