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首页> 外文期刊>Physica, B. Condensed Matter >Debye-type SAW attenuation in C-60 thin films below the glass-transition temperature
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Debye-type SAW attenuation in C-60 thin films below the glass-transition temperature

机译:低于玻璃化转变温度的C-60薄膜中的德拜型声表面波衰减

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Ultrasonic attenuation measurements in C-60 thin films were carried out by using the surface acoustic wave (SAW) devices. The measurement temperatures were between 15 and 60 K, and the SAW frequencies were 320, 400 and 480 MHz. The obtained attenuation peaks around 40 K depended on the measurement frequencies. The attenuation can be regarded as a Debye-type mechanism. An activation energy E-a = 12.4 meV and relaxation time EO 9.35 x 10(-12) s were estimated by Arrhenius plotting. There are previously unreported local barriers (E-a = 12.4 meV) in the molecular orientational potential. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 13]
机译:使用表面声波(SAW)装置对C-60薄膜进行超声衰减测量。测量温度在15至60 K之间,并且SAW频率为320、400和480 MHz。在40 K附近获得的衰减峰取决于测量频率。衰减可以被视为德拜型机制。通过Arrhenius绘图估计活化能E-a = 12.4 meV,弛豫时间EO为9.35 x 10(-12)s。分子取向势中以前没有报告过的局部势垒(E-a = 12.4 meV)。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:13]

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