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2000thermodynamic functions, thermochemistry thermodynamic functions, thermochemistry E 3000 -029Ni-Doped versus Undoped Mg-MgH 2 Materials for High Temperature Heat or Hydrogen Storage.-Ni-doped Mg-MgH 2 materials exhibit excellent hydrogenation/dehydrogenation cycling stability and high hydrogenation rates even under very mild pressure/temp. conditions.The doped materials are suitable for applications such as solar generation of heat and cold, heat pumps, and hydrogen storage. On the other hand, neat Mg powders can be used as cheap materials for reversible thermochemical high temp. heat storage in the range 450-500 • C.