Calorimetric study of hydrogen interaction with Sm2Fe17

For the first time hydrogen interaction with Sm2Fe17 was studied by means of calorimetric method with applying of the Tian-Calvet type calorimeter at 200 and 250 °C. The processes of hydrogen absorption and desorption were carried out and pressure-composition isotherms for the Sm2Fe17H2 system and enthalpy change with hydrogen concentration in the metallic matrix were obtained. On the base of collected data supposition about order of filling the interstitial site by hydrogen atoms was made.