Heats of Formation of Complex Compounds (Compounds Semiconductor, New Ceramics)

化合物半导体和新型陶瓷是一种多组分化合物，是电子器件和结构材料在极限条件下非常重要的功能材料。生成热是这些络合物稳定性指标、合理生产和质量控制的必要性质之一。然而，可用的数据很少。本研究设计并制作了一种Calvet型溶液量热计，用于测定各种络合化合物的生成热。该量热计由一个具有大热容和宽均匀温区的炉和一个带有两个孔的铜等温套组成。、104个热电偶桩。在室温条件下进行了热传递和个人计算机热评定程序的检查，然后测量了量热计电池内的温度分布和更高温度下的传热。量热计的热容量是通过向内部加热器提供恒定的电力，将锡滴入锡液中来确定的。为了验证量热计的准确性，在573 K的温度下，将固体Pb加入到锡液中，测量了液态锡-铅合金的混合热。所得结果与Kleppa报道的数据吻合较好。测定了In、Ga、InP和GaAs在750k时的溶解热。通过将这些直接测量值与热力学数据相结合，对InP和GaAs的生成热进行了评估，并与报道的数据进行了比较。除了GaAs之外，其他协议都很好。

Compound semiconductors and new ceramics, which are very important functional materials for electronics and structural materials under ultimate conditions, are multicomponent compounds. Heats of formation are one of necessary properties for stability index, rational production and quality control of these complex compounds. However, few data are available. In this study, a solution calorimeter (Calvet type) was designed and constructed to determine the heats of formation of various kinds of complex compounds. The calorimeter consists of a furnace with large heat capacity and wide uniform temperature zone, a copper isothermal jacket with two holes for the calorimeter cells., and 104 thermocouple piles. Heat transfer and a program for caloric evaluation by the personal computer were checked at room temperature and then temperature distribution inside the calorimeter cell and heat transfer at higher temperature were measured. The heat capacity of the calorimeter was determined by supplying a constant electric power to the internal heater on dropping Sn into liquid Sn bath. In order to check the accuracy of the calorimeter, the heats of mixing of liquid Sn-Pb alloys were measured by adding solid Pb to liquid Sn bath at 573 K. Obtained results are in good agreement with the data reported by Kleppa.Heats of solution of In,Ga,InP and GaAs into Sn bath have been determined at 750 K. By combining these directly measured values with thermodynamic data, heats of formation of InP and GaAs have been evaluated and compared with the reported data. There are good agreements each other except for GaAs.