SOLUBILITY OF HYDROGEN IN AMORPHOUS PD1-XSIX ALLOYS AS HYDROGEN PERMEABLE MEMBRANES

Hydrogen solubility of amorphous Pd1-xSix (x = 0.15, 0.175, 0.2) alloy s in the form of ribbon, which were prepared with a single-roller melt spinning technique, was measured by a pressure-variable method at ele vated temperatures up to 200 degrees C. It was found that the hydrogen solubility in the amorphous alloys, strongly depending on the Si cont ent, decreased with an increase in the Si content, and never obeyed th e Sieverts law. The amorphous alloys showed 3-4 times higher hydrogen solubility than the corresponding crystallized ones. Based on the theo ry proposed by Kirchheim et al., an attempt was made to postulate a si mplified equation to describe the relation between the pressure and co mposition of hydrogen in the amorphous alloys. As a result, similar to the half power law for the crystalline metal, the so-called nth power law with respect to pressure was found to be applicable for the amorp hous Pd1-xSix alloys.