Differential scanning calorimetry studies of amorphous Zr2PdHx and Zr3RhHx

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Abstract
The effects of hydrogen concentration and crystal structure on thermal stability of amorphous Zr2PdHx and Zr3RhHx samples were studied with differential scanning calorimetery (DSC). Samples showing endothermic irreversible transitions are a-Zr2PdHx [x=1.91 (powder and foil)/2.7] and a-Zr3RhHx (x=3.7/4.1/5.0/5.1/5.2). Samples showing exothermic irreversible transitions are a-Zr2Pd alloy, a-Zr2PdH1.91 (powder and foil), a-Zr3Rh alloy, and a-Zr3RhHx (x=3.7/4.1/5.0/5.1). Powder x-ray diffraction methods suggest that crystalline Zr2PdHx, ZrHx, and ZrPd are decomposition products from the Zr2PdHx system, that depend upon experimental conditions. The a-Zr3RhHx hydrides decomposed into ZrHx phases and Rh metal. The effect of DSC heating on the products, the heats of transition, and the activation energies are the thermal data that are presented.

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