|About this Abstract
||MS&T23: Materials Science & Technology
||High Temperature Corrosion and Degradation of Structural Materials
||Evaluating Corrosivity of Molten Salts Using Halide Optical Basicity Index
||Krishnan S. Raja, Dev Chidambaram
|On-Site Speaker (Planned)
||Krishnan S. Raja
Molten salts are used as heat transfer media in several energy applications such as concentrated solar power plants, and molten salt nuclear reactors. The presence of oxygen, moisture, and other impurities including redox active agents increases the corrosivity of the molten salts. Typically, optical basicity represents the ability of oxides to yield oxide ions for a redox reaction, and it is measured by optical absorption spectroscopy. This concept is extended to halide ions in molten salt. Optical basicity represents the extent of electron donation by a ligand (for example a halide ion) in a coordinate bond. Experimental determination of optical basicity is based on the ratio of frequency shift in the optical spectra of probe ions in the medium of interest compared to that of probe ions surrounded by ‘ionic’ anions. The optical basicity is correlated to the corrosivity of salts by considering the oxidation states of ions in equilibrium.