Resumo

GENNARI, F. C.  e  URRETAVIZACYA, G.. Mechanical alloying of Mg-Ge based mixturas under hydrogen and argon atmospheres. Lat. Am. appl. res. [online]. 2002, vol.32, n.4, pp.275-280. ISSN 0327-0793.

The effect of milling atmosphere and milling time on the nature and composition of milled products is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and differential scanning calorimetry (DSC). The milling of the 2Mg-Ge mixture under argon and hydrogen allows the formation of Mg₂Ge. The MgH₂ hydride is also formed after milling both 2Mg-Ge and 2Mg-0.5Ge-0.5Ni mixtures under hydrogen. The formation of Mg₂Ni during the milling of the 2Mg-0.5Ge-0.5Ni mixture under argon and the formation of MgH₂ under hydrogen make the formation kinetics of Mg₂Ge slower. The DSC measurements indicate that the decomposition temperature of MgH₂ is 250 °C. The presence of Ge and Ge-Ni reduces in more than 200 °C the MgH₂ decomposition temperature respect to pure MgH₂. The Mg hydriding process during the mechanical alloying is improved by the presence of Ni in the starting mixture.

Palavras-chave : Mechanical alloying; Mg-Ge mixture; Mg-Ni mixture; Magnesium hydride; Mechanosynthesis..

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