用差热分析法绝对标定相变潜热
Absolute calibration of the latent heat of transition using differential thermal analysis
摘要：
我们描述了一个简单而准确的差热分析设置测量的潜热的固态材料经历突然的相变的温度范围从77 K以上的室温。我们报告的绝对校准的过渡的潜热的数值技术，而不需要一个参考样品。该技术适用于三种不同的样品-三氧化二钒进行莫特过渡，铋钡磁致弹性过渡，和金属间的赫斯勒化合物。在每种情况下，推断的潜热值与文献值一致，在其误差范围内。为了进一步证明绝对校准的重要性，我们表明，在莫特转变的潜热的变化在三氧化二钒（V $_2$ O $_3$）保持恒定的2%以内，即使过饱和的深度变化约10 K，在非平衡动态滞后测量。我们也将此技术用于测量随温度变化的比热。
英文摘要：
We describe a simple and accurate differential thermal analysis set up to measure the latent heat of solid state materials undergoing abrupt phase transitions in the temperature range from 77 K to above room temperature. We report a numerical technique for the absolute calibration of the latent heat of the transition, without the need of a reference sample. The technique is applied to three different samples -- vanadium sesquioxide undergoing the Mott transition, bismuth barium ruthenate undergoing a magnetoelastic transition, and an intermetallic Heusler compound. In each case, the inferred latent heat value agrees with the literature value to within its error margins. To further demonstrate the importance of absolute calibration, we show that the changes in the latent heat of the Mott transition in vanadium sesquioxide (V$_2$O$_3$) stays constant to within 2% even as the depth of supersaturation changes by about 10 K, in non-equilibrium dynamic hysteresis measurements. We also apply this technique for the measurement of the temperature-dependent specific heat.
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