An investigation has been made of alloys of 50 to 6 300 ppm Eu in Mg. Data obtained by the use of the Mossbauer spectroscopy of IslEu, magnetic susceptibility and scanning electron microscopy show that solid solutions do not form in this system, but that the Eu precipitates into two eutectic intermetallics. While the Eu ions are in a divalent state at all temperatures for strain-free samples, i...

A method for mounting a He closed-cycle cryostat which consists of an exchange gas envelope around the cold head to cool an independently supported sample mount as in model DE202 with a DMX-20 interface from APD Cryogenics, Inc. is described. No detectable vibration of the sample mount is observed as evaluated using 57Fe Mossbauer spectroscopy and a piezoelectric accelerometer. Using a 25 ,um t...

on carbon. These particles can interact with the active sites of the carbon to form a species a t the metal-carbon interface which is stable against high-temperature reduction. This interaction may occur via oxygen atoms bonding with both the carbon surface and iron atoms contacting the carbon. This oxygen could be provided by dissociation of the C O ligands during decomposition. The remainder ...

By means of the Mossbauer Effect a systematic dose and dose rate study has been performed on xenon implanted in iron. The substitutional fraction of the xenon nuclei decreases when the implantation dose is increased from 5 X 1011 atoms/cm2 to 1015 atoms/cmz. Two samples were implanted both to a dose of 5 X 1013 atoms/cm* but with a dose rate ratio of 75. The sample with the highest dose rate sh...