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CsHSO$$_{4}$$-Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$複合体の結晶構造

Crystal structure of CsHSO$$_{4}$$-Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$ composite

深谷 奈菜*; 樹神 克明   ; 井川 直樹   ; 高橋 東之*

Fukaya, Nana*; Kodama, Katsuaki; Igawa, Naoki; Takahashi, Haruyuki*

室温から200$$^{circ}$$C付近までの温度域で高いプロトン伝導度を示すCsHSO$$_{4}$$-Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$複合体について、中性子回折およびX線回折実験を実施し、その結晶構造を解析した。複合体中のマトリクスはCs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$と同一の結晶構造として精密化できた。複合体にはCs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$, CsHSO$$_{4}$$の他に、これらには帰属できない回折線も観測された。また、180$$^{circ}$$Cで加熱後の中性子回折測定では、CsHSO$$_{4}$$に帰属する回折線が消失し、新たな回折線が見られたことから、加熱によってCsHSO$$_{4}$$の分解、あるいは結晶性が失われたことが示唆される。発表ではこれら構造の変化の詳細について議論する予定である。

Crystal structure of CsHSO$$_{4}$$-Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$ composite was analyzed using the neutron diffraction and X-ray diffraction method. The matrix in the composite could be refined as the same crystal structure as Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$. In addition to Cs$$_{x}$$H$$_{(3-x)}$$PW$$_{12}$$O$$_{40}$$ and CsHSO$$_{4}$$ for composite, these include unattributable diffractions were also observed. In addition, the neutron diffraction data after heating at 180$$^{circ}$$C revealed that the diffractions attributed to CsHSO$$_{4}$$ disappeared and new diffractions were observed. Those suggested that the decomposition or loss of crystallinity of CsHSO$$_{4}$$ were caused by the heating.

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