abstract |
A composition for the transport and storage of heat energy, which comprises alkali metal polysulfides of the formula (Me1 (1-x) ,Me2 x ) 2 S z , where Me1 and Me2 are selected from the group of alkali metals consisting of lithium, sodium, potassium, rubidium and cesium, Me1 is different from Me2 and x is from 0 to 1 and z is from 2.3 to 3.5. |