Cationic Self-Diffusion in Ionic Plastic Phases of Thallium Nitrite and Nitrate and in Thallium Thiocyanate.

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概要

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• Cationic self-diffusion in the ionic plastic phases of TlNO<SUB>2</SUB> and TlNO<SUB>3</SUB> was investigated by measuring temperature dependences of the <SUP>203,205</SUP>Tl NMR spin-lattice relaxation time and the electrical conductivity. The NMR results snowed that the Tl<SUP>+</SUP> ions in these phases undergo rapid translational diffusion with the activation energy (<I>E</I><SUB>a</SUB>) of 48 and 77 kJ mol<SUP>−1</SUP> for nitrite and nitrate, respectively. The <I>E</I><SUB>a</SUB> values agreed well with those obtained from the electrical conductivity, indicating that the cation is the electric carrier. The diffusion constants (<I>D</I>) estimated from the relaxation time and conductivity data were ca. 10<SUP>−12</SUP> m<SUP>2</SUP> s<SUP>−1</SUP> at the respective melting point (<I>T</I><SUB>m</SUB>) of plastic phase. The tendency that <I>D</I> at <I>T</I><SUB>m</SUB> has the characteristic value given above is recognized for other ionic plastic phases so far reported. The Tl<SUP>+</SUP> ionic conductivity in TlSCN, which makes no plastic phase, was reported in comparison.

• 公益社団法人 日本化学会の論文

著者

• Furukawa Yoshihiro

  Department Of Chemistry Faculty Of Science Nagoya University

• Ikeda Ryuichi

  Department Of Chemistry Faculty Of Engineering Gifu University

• Nakamura Daiyu

  Department of Chemistry Faculty of Science Nagoya University

• Nagase Hirokazu

  Department of Chemistry, Faculty of Science, Nagoya University

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