热分析

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！

DTA的含义没有弄清楚吧！
DTA原理是：物质在升温或者降温过程中，由于内部发生物理或者化学变化，将有能量的释放或者吸收，宏观表现为升温（降温）过程被改变，在温度记录图纸上体现出来的就是峰值。这个现象也即热效应。
最高和最低峰一般对应着材料的相变点。

你好，那它的衍射峰所包围的面积是代表相变潜热吗？
谢谢！

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.

DTA的衍射峰面积也是熔化潜热。
其实DTA与DSC用原理是一样的，只不过相对于DTA，DSC的分辨率更高，精确度更高，带有解析功能。