A preferred intermetallic diffusion barrier for use in {HEAD ~ the inventive method} is {TAIL ~ noble metal eggshell catalyst} comprising zirconia stabilized with yttria, in particular zirconia stabilized with 6 to 8 wt % yttria 
A preferred intermetallic diffusion barrier for use in { HEAD ~ the inventive method } is { TAIL ~ noble metal eggshell catalyst } comprising zirconia stabilized with yttria , in particular zirconia stabilized with 6 to 8 wt % yttria
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH