Compositions, devices, systems, and methods directed to concentrating solar power are disclosed. In certain aspects, the disclosure is directed to a heat storage material comprising a transformative alloy composition (internal core component) Al--B--Si--Fe/Al.sub.2O.sub.3--B.sub.2O.sub.3--SiO.sub.2--Fe.sub.3O.sub.4 embedded in a SiC outer coating.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 This invention was made, to some extent, with government support under AFOSR Grant FA9550-12-1-0242 awarded by the Air Force Office of Scientific Research and DOE Grant DE-FE0008400 awarded by the Department of Energy. The U.S. government may have certain rights in the invention.