کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425865 | 1395868 | 2007 | 12 صفحه PDF | دانلود رایگان |

Low energy electron diffraction, grazing incidence X-ray diffraction and photoemission were used to decipher the detailed structural arrangement and chemical composition of the surface region of a transition metal carbide, VC0.8(1 1 0). In agreement with previous scanning tunneling microscopy (STM) studies, we find that the surface reconstructs with a ridge-and-valley grating structure along the [11¯0] direction resulting from {0 0 1} faceting for the (3 Ã 1) and the (4 Ã 1) phases.Both superstructures terminate on the vacuum side with a nearly stoïchiometric VC region due to C segregation, in contrast with the conclusions drawn from this previous STM study. However, the present experiments clearly show that these phases are metastable, and slow cooling results in a (1 Ã 1) surface, which is highly C depleted, similarly to the (1 0 0) face.
Journal: Surface Science - Volume 601, Issue 16, 15 August 2007, Pages 3383-3394