Several systems of thermally stable inorganic salts with low melting points are disclosed. These compositions include sodium, potassium, zinc, chloride, and sulfate and can have thermal stability limits greater than 700.degree. C.
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT
 This invention was made with Government support under Grant No, DE-FG36-08GO18144 awarded by the Department of Energy. The Government has certain rights in this invention.