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tailaoer666

金虫 (正式写手)


[交流] 【求助】DTA热分析

各位虫友:
    大家好!有哪位大侠知道DTA和DSC的的区别,从部分文献中可得到DSC的衍射峰面积就是本次相变所释放的潜热,那么DTA的衍射峰面积又有什么涵义呢?
谢谢!
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feeting

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The difference between DTA and DSC

tailaoer666(金币+1): 2011-02-20 18:57:19

In DTA, the heat flow to the sample and reference remains the same. The variable is the temperature difference between the sample and reference. When the sample and reference are heated identically, phase changes and other thermal processes cause a difference in temperature between the sample and reference

In DSC, the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment.

curve:
DTA: delta T vs T.  The T is the temperature of reference substance.
unit: both are degrees C.

DSC: Heat flow difference versus T. T is the temperature of reference substance.
unit: y axis is mW/mg. x axis is degree C.



DSC is more accurate and powerful.
4楼2011-02-18 18:22:13
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