Development of Raman spectroscopic sensors for magnesium in a molten salt system

A study of the Raman spectra of the soluble magnesium species in melts such as NaCl-KCl-CaCl{sub 2} (41-41-18 mole %) has been carried out. Over the range of 0 to 25 mole % MgCl{sub 2} in NaCl-KCl-CaCl{sub 2} at 700{degree}C, the intensity of the MgCl{sub 4}{sup 2}{double prime} Raman band near 250 cm{sup {minus}1} was found to vary linearly with Mg(II) concentration. A new normalization procedure has been developed to generate these results. An all silica fiberoptic probe has also been developed to carry out these measurements. Details of these studies will be discussed. 6 refs.