High Temperature Calorimetry of Refractory Materials

这笔拨款支持对耐火材料的热化学进行系统的研究。这些研究是基于一种独特的高温反应量热计的应用，该量热计在高达约1500K的温度下连续工作。这种热量计是在1987-88年美国国家科学基金会的特别支持下研制的。在今后的三年里，这项研究将扩展到由放射性较弱的锕系元素钍和铀与晚期过渡金属和贵金属组成的化合物。研究人员计划对独特的高温反应量热计进行特殊修改，使其能够在温度高达约1500K的情况下测量二元液态合金中溶液的混合热，而无需从室温引入两种反应物中的一种。目标是更好地理解二元系统的热力学性质如何取决于其两个组成部分的特征的基础。对于以过渡金属二元化合物为基础的铀和钍合金的热力学性质，很少有热量学研究。这项工作增加了这些元素的二元化合物的焓数据库。＊＊＊

Kleppa 9726699 This grant supports systematic investigations of the thermochemistry of refractory materials. These studies are based on applications of a unique high-temperature reaction calorimeter which is operated continuously at temperatures up to about 1500K. This calorimeter was developed with special support from the NSF in 1987-88. During the coming three years this investigation will be extended to the compounds formed by the mildly radioactive actinide elements thorium and uranium with the late transition metals and the noble metals. The investigations plan a special modification of the unique high-temperature reaction calorimeter which will allow measurements of heats of mixing the heats of solution in binary liquid alloys at temperatures up to about 1500K without introducing one of the two reactants from room temperature. The goal is to better understand the basis for how thermodynamic properties of a binary system depends on the character of its two constituents. %%% There have been few calorimetric studies of the thermodynamic properties of uranium and thorium alloys based on binaries with the transition metals. This work adds to the enthalpy data base for binary compounds of these elements. ***