Energetics of Phase Formation of Group VIII Transition Metal Silicides

9408558第VIII族(铁、钴、镍)过渡金属的二元固体硅化物相形成的迈尔斯自由能将通过反应喷射方案与喷出蒸汽的质谱分析相结合来测量。硅化物将与固体二氧化硅在800-1500 K的温度范围内平衡，生成吉布斯自由能将根据测量的单氧化物(G)压力结合文献数据计算这些组分之间的平衡。这些结果将与热容和熵数据相结合来计算298K下的标准生成热。这些结果有望用于各种冶金问题的模拟、相图特征的验证以及电子工业中使用的化学气相沉积过程的开发和模拟。%硅与钴、镍和铁的化合物的稳定性(即化学键的强度)将通过高温技术进行测量，该技术涉及这些材料与二氧化硅之间的反应研究。这些结果有望对电子工业中使用的工艺的开发和建模以及冶金问题的建模有所帮助。***

9408558 Myers Free energies of phase formation of binary solid silicide phases of the Group VIII (Iron, Cobalt, Nickel) transition metals will be measured by means of a reactive effusion scheme coupled with mass spectrometric analysis of the effusing vapors. Silicides will be equilibrated with solid Silicon Dioxide at temperatures in the range of 800-1500 K. The gibbs free energies of formation will be calculated from the measured Silicon Mono-oxide(g) pressures combined with literature data for the equilibrium between these components. These results will be combined with heat capacity and entropy data to compute standard enthalpies of formation at 298 K. The results are expected to be useful in the modeling of a variety of metallurgical problems, in the verification of phase diagram features, and in the development and modeling of chemical vapor deposition processes used in the electronics industry. %%% The stabilities of compounds of silicon with cobalt, nickel and iron (i.e. strengths of chemical bonds) will be measured by high temperature techniques involving a study of reactions between these materials and silicon dioxide. Results are expected to be useful in development and modeling of processes used in the electronics industry and in modeling of metallurgical problems. ***