I need to add phase-change salts (and possibly even ceramic bricks) to my fakes paper. Can you give me / point me to a likely candidate?
http://www.seas.upenn.edu/~meam502/project/reviewexample2.pdf (2007)
Very few with a melting-point above 100C -- and most of those are categorized as Group II or III or "-"
Group I, most promising; group II, promising; group III, Less promising; -- insufficient data.
Methyl fumarate (CHCO2NH3)2 102C 242kJ/kg Group I
MgCl26H2O 117C 167 kJ/kg Group I
(Compared to water specific heat at 4 kJ/kg K : Rock/Brick 0.9 kJ/kg K)

