MICROSCOPIC INVESTIGATIONS OF THE NANOCOMPOSITE WGA

The nanocomposite WGa was investigated by perturbed gamma gamma-angula r correlation spectroscopy (PAC) using the probe atom In-111. The WGa samples were prepared by inert gas condensation; the Ga content ranged between 10 at.% and 50 at.%. The radioactive In-111 atoms were diffus ed into the WGa samples at temperatures between 600 K and 740 K. Two d istinct locations of the In-111 probe atoms were observed. One was ide ntified as a substitutional site within precipitated alpha-Ga, for whi ch a depression of the melting temperature was observed. The other was due to specific properties of the composite WGa and is stable up to t emperatures of at least 500 K.