首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Thermal diffusion near glass transition in Ge-Se glasses measured by photoacoustics
Authors:K N Madhusoodanan  Jacob Philip
Institution:(1) Department of Physics, Cochin University of Science and Technology, 682 022 Cochin, India
Abstract:The glass transition in Ge x Se1−x ) (0·1 ⩽x ⩽ 0·25) glasses has been investigated using the photoacoustic (PA) technique. It is found that the PA amplitude and phase undergo anomalous changes at the glass transition temperatureT g. The amplitude has critical minimum and phase has maximum values atT g. The variation of the thermal diffusivity, determined by measuring the frequency dependence of the PA amplitude and phase, with temperature shows sharp decrease near the glass transition temperature. The temperature dependence of the optical energy gap also has been measured and it shows a decrease with temperature for all compositions, the rate of decrease being higher for temperatures greater thanT g.
Keywords:Thermal diffusivity  glass transition  photoacoustic technique
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号