相变
材料科学
动态力学分析
热的
玻璃化转变
硬化(计算)
频域
玻璃化
热力学
复合材料
计算机科学
物理
聚合物
计算机视觉
核物理学
图层(电子)
标识
DOI:10.1080/01411599708227770
摘要
Abstract Dynamic Mechanical Analysis (DMA-7, PERKIN ELMER) is a very useful device for determining the thermal expansion and the low-frequency elastic compliances of crystals. The complex compliances can be measured in a frequency range from 10mHz to 50Hz and for temperatures between 6 and 1300K. A great advantage is that also very small samples (a 0.1 mm thick) can be measured. Here we give an overview of our recent DMA-measurements in different systems and discuss the main results: – In KSCN Entropy fluctuations were found for the first time at low frequencies. – In Cm a glass transition was detected and the freezing process was studied in detail. Moreover, a very unusual elastic hardening was observed. – In ALHS ferroelastic domain freezing was found for the first time. From these examples one can see, that a variety of phenomena, i.e. low-frequency dynamics, due to entropy fluctuations, glass freezing, domain freezing, etc. can be well studied by Dynamic Mechanical Analysis.
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