High Temperature Calorimetry of Refractory Systems

Kleppa教授由理论和 计算化学计划在化学部和金属， 材料系陶瓷、电子材料专业 研究继续他在高温研究方面的研究 耐火材料量热法 这项工作的重点是 二元金属间化合物的热化学。 研究 强调了高温反应量热法的以下领域： 1)镧系元素与镧系元素合金的热化学 过渡金属和贵金属; 2）合金的热化学 第V族过渡金属与后过渡金属; 3）混合 量热法在1473 K，高于温度，熔融石英refactors 4）高温直接合成的新应用 量热法用于研究基性和非基性之间的地层结构 酸性氧化物 有许多应用需要材料， 它们的结构完整性在极高的温度甚至超过 二氧化硅熔化的温度。 二元金属间合金 过渡元素，以及镧系元素和过渡元素之间的关系 金属具有优异的耐火性能。 克莱帕的研究小组是 是美国仅存的少数几个 二元金属间化合物的系统量热研究。 这 研究提供了重要的基本见解， 这些材料的性质取决于材料的电子结构。 涉及的金属

Professor Kleppa is jointly funded by a grant from the Theoretical and Computational Chemistry Program in the Chemistry Division and the Metals, Ceramics, and Electronic Materials Program in the Division of Materials Research to continue his research in the study of high temperature calorimetry of refractory materials. The major emphasis of this work is on the thermochemistry of binary intermetallic compounds. The research emphasizes the following areas of high-temperature reaction calorimetry: 1) Thermochemistry of alloys of the lanthanide elements with late transition metals and with noble metals; 2) Thermochemistry of alloys of Group V transition metals with the late transition metals; 3) Mixing calorimetry at 1473 K, above temperatures where fused silica refactories can be used; and 4) New applications of high temperature direct synthesis calorimetry for studies of the enthalpies of formations between basic and acidic oxides. There are a number of applications which require materials which maintain their structural integrity at extremely high temperatures even beyond the temperature at which silica melts. Binary intermetallic alloys between transition elements, and between lanthanide elements and transition metals have excellent refractory properties. Kleppa 's research group is one of the few remaining groups in the United States which performs systematic calorimetric studies of binary intermetallic compounds. This research provides important fundamental insights into the way in which properties of these materials depend on electronic structures of the metals involved.