Oxide Melts Studied by High Temperature High Pressure Calorimetry

氧化物熔体，如硅、硼和铝氧化物在金属、玻璃陶瓷领域很重要，就像地球科学一样，在目前的计划中，它是为了直接在热量计中测量热调热含量，与电化学和光谱技术有关的其他研究; Tian-Calvet型的高温热量计已被构造并应用于测量（1）硅的热量含量用溶剂凝胶方法制备的铝合金非水晶糖粉和（2）用硼氧化物熔化的碳酸氢钠反应的热量。在成型机中，各种热处理的粉末样本在2 PbO·B_2O_3溶剂中被溶解。热内容变化由铝合金含量建议协调改变铝原子。在后期，对解决方案CO的神秘性质的谴责2个进化是不够平滑的，无法给出可再生的结果。此测量已被用于确定与水蒸汽相关的系统的正确条件。用于redox equilibrium测量的线性扫描电压被应用于带有calorimetry.Molecular binamics simulations as well as quantum Mechanical calculation were also attempted for better understanding of the oxide melts。

Oxide melts like silicate,borate,and aluminosilicate are important in the field of metallurgy,glass ceramics as well as earth science.In the present progect it was intended to measure the thermodynamic heat contents directly in molten state in a calorimeter,along with other studies with electrochemical and spectroscopic techniques.A high temperature calorimeter of Tian-Calvet type was constructed and applied to measure(1) the heat contents of silica-alumina non-crystalline powder prepared by the sol-gel method and(2) the heat of reaction of sodium carbonate with boric oxide melt.In the former, the powder samples of various heat treatment was dissolved in 2PbO・B_2O_3 solvent.Heat content variation which increases with the alumina content suggests coordination change around Al atom with heat treatment.In the latter,due to the viscous nature of the solution CO_2 evolution was not smooth enough to give reproducible results.This measurement was carried out to find proper condition to handle the system associated with water vapor.A linear sweep voltammetry for redox equilibrium measurement was applied in varous melts in parallel with the calorimetry.Molecular bynamics simulations as well as quantum mechanical calculation were also attempted for better understanding of the oxide melts.