کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5426237 | 1395883 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The effect of Pt on Ni3Al surface oxidation at low-pressures The effect of Pt on Ni3Al surface oxidation at low-pressures](/preview/png/5426237.png)
The fully-oxidized surface that forms on (1Â 1Â 1) oriented Ni3Al single crystals, with and without Pt addition, at 300-900Â K under oxygen pressures of ca. 10â7Â Torr was studied using XPS, AES, and LEIS. Two main types of surfaces form, depending upon oxidation temperature. At low-temperature, the predominant oxide is NiO, capped by a thin layer of aluminum oxide, which we refer to generically as AlxOy. At high-temperature (i.e., 700-800Â K), NiO is replaced by a thick layer of AlxOy. By comparing samples that contain 0, 10 and 20Â at.% Pt in the bulk, we find that the effect of Pt is to: (1) reduce the maximum amount of both NiO and AlxOy; and (2) shift the establishment of the thick AlxOy layer to lower temperatures. Platinum also decreases the adsorption probability of oxygen on the clean surface.
Journal: Surface Science - Volume 601, Issue 1, 1 January 2007, Pages 146-154