ABSORPTION OF HYDROGEN BY AMORPHOUS AND CRYSTALLINE 89FE-11P POWDER -DEFORMATION OF THE POWDER UNDER PRESSURE AND RELAXATION ON HEATING

The process of hydrogen absorption by amorphous and crystalline powder of the 89Fe-11P alloy, obtained by electrolyzing an aqueous solution of the corresponding electrolytes, was studied by differential scannin g calorimetry. It was shown that hydrogen absorption takes place exoth ermally in the temperature range 100-300 degrees C. The relevant kinet ic and thermal parameters of the absorption process were determined: r ate constants, enthalpies, activation energies and frequency factors. The process of powder deformation by pressing and its relaxation was i nvestigated by measuring the electrical resistance during heating and cooling in the temperature range 20-610 degrees C. The X-ray diffracto grams show that the powder obtained contains 10% crystal phase and tha t by heating to 500 degrees C complete crystallization takes place.