Temperature-dependent Ta hydride formation for recycling of Ta scraps: Experimental and thermodynamic investigations.

We report on the theoretical and experimental investigations about the Ta-hydride formation depending on the temperature for recycling of Ta scraps. The structural investigations based on scanning electron microscope and X-ray diffraction (XRD) showed that the amount of hydrogen incorporated into the Ta matrix varied with hydridation temperature. The XRD measurement showed that the H/Ta mole ratio in Ta-hydride increased with increasing the hydridation temperature up to 700 °C and then decreased with increasing the temperature furthermore. Depending on the hydridation temperature, various phase of Ta-hydride, such as TaH 0.93 and Ta 2 H were formed and this hydride process was verified by thermodynamic analysis. [ABSTRACT FROM AUTHOR]