a b s t r a c tCalcium-halide-doped lithium amide-magnesium hydride samples were prepared both by hand-grinding and ball-milling 2LiNH 2 -MgH 2 -xCaX 2 (x = 0, 0.1, and 0.15; X = Cl or Br). The addition of calcium halides reduced the hydrogen desorption temperature in all samples. The ball-milled undoped sample (2LiNH 2 -MgH 2 ) began to desorb hydrogen at around 125°C and peaked at 170°C. Hydrogen desorption from the 0.15 mol CaCl 2 -containing sample began ca 30°C lower than that of the undoped sample and peaked at 150°C. Both the onset and peak temperatures of the CaBr 2 sample (x = 0.15) were reduced by 15°C compared to the chloride. Kissinger's method was used to calculate the effective activation energy (E a ) for the systems: E a for the 0.15 mol CaCl 2 -containing sample was found to be 91.8 kJ mol À1 and the value for the 0.15 mol CaBr 2 -containing sample was 78.8 kJ mol À1 .
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