首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >A Pulsed ~(35)Cl NQR Study on the Molecular Motions and Phase Transition of 4-Chlorobenzyl Alcohol
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A Pulsed ~(35)Cl NQR Study on the Molecular Motions and Phase Transition of 4-Chlorobenzyl Alcohol

机译:〜(35)Cl NQR脉冲研究4-氯苄基醇的分子运动和相变

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摘要

The spin-lattice and spin-spin relaxation times T_1 and T_2 of ~(35)Cl NQR were measured for the high (Ⅰ) and low (Ⅱ) temperature phases of 4-chlorobenzyl alcohol in the range 50 < T/K < 338 (transition and melting points: 236 and 343.5 K, respectively). In phase Ⅱ the T_1 behavior in the range 50 < T/K < 90 can be explained by lattice vibrations and that in the range 90 < T/K < 190 by reorientation with an activation energy of ca. 3.8 kJ/mol. In phase Ⅰ, the T_1 behavior at T > 260 K is explainable by another reorientation with E_a ≈ 4.7 kJ/mol. The T_1 vs. T curves revealed that in both phases the crystal dynamics is anomalous in the vicinity of the transition temperature. Lattice defects accumulated in phases Ⅰ and Ⅱ by the phase transition were found to be responsible for the extremely short inverse line width parameters (T_2~*).
机译:在50 260 K处的T_1行为可以用另一种E_a≈4.7 kJ / mol的重新取向来解释。 T_1与T的曲线表明,在两个相中,晶体动力学在转变温度附近都是异常的。发现相变在Ⅰ相和Ⅱ相中积累的晶格缺陷是极短的反线宽参数(T_2〜*)的原因。

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