Self-diffusion and melting in the plastic phases of neopentane as studied by NMR relaxation at high pressures.
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概要
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Proton spin-lattice relaxation time <I>T</I><SUB>1</SUB> in the plastic phase of 2,2-dimethylpropane (neopentane) was measured at 10 MHz up to 170 MPa between 192.7 and 308.2 K. <I>T</I><SUB>1</SUB> near the melting point is determined by self-diffusion. The enthalpy and volume of activation of this motion suggest that self-diffusion occurs through a single vacancy mechanism. The correlation time of self-diffusion at the melting point (<I>T</I><SUB>f</SUB>) is (3.2±0.5)×10<SUP>−7</SUP> s irrespective of external pressure. The diffusion rate is a function only of <I>T</I><SUB>f</SUB>⁄<I>T</I>, <I>i.e.</I> the law of corresponding states holds. The feature of activation properties of self-diffusion is strongly correlated with the melting phenomenon. The melting curve of the phase diagram was also determined and a possibility of existence of another plastic phase was found above 40 MPa.
- 公益社団法人 日本化学会の論文
著者
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Takeda Sadamu
Department Of Chemistry Faculty Of Science Osaka University
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Chihara Hideaki
Department Of Chemistr Faculty Of Science Osaka University
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Soda Gen
Department of Chemistry, Faculty of Science, Osaka University
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