HEAT-CAPACITY MEASUREMENT BY MODULATED DSC AT CONSTANT-TEMPERATURE

被引：215

作者：

BOLLER, A ^{[1
]}

JIN, Y ^{[1
]}

WUNDERLICH, B ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV ANALYT SCI,OAK RIDGE,TN 37831

来源：

JOURNAL OF THERMAL ANALYSIS | 1994年 / 42卷 / 2-3期

关键词：

HEAT CAPACITY; MODULATED DSC;

D O I：

10.1007/BF02548519

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The mathematical equations for step-wise measurement of heat capacity (C(p)) by modulated differential scanning calorimetry (MDSC) are discussed for the conditions of negligible temperature gradients within sample and reference. Using a commercial MDSC, applications are evaluated and the limits explored. This new technique permits the determination of C(p) by keeping the sample continually close to equilibrium, a condition conventional DSC is unable to meet. Heat capacity is measured at 'practically isothermal condition' (often changing not more than +/-1 K). The method provides data with good precision. The effects of sample mass, amplitude and frequency of temperature modulation were studied and methods for optimizing the instrument are proposed. The correction for the differences in sample and reference heating rates, needed for high-precision data by standard DSC, do not apply for this method.

引用

页码：307 / 330

页数：24