During the CVD process, Copper and Nickel which are both Face Centered Cubic crystalline structures are used as substrates for shaping hexagonal atomic structures such as graphene and hexagonal Boron-Nitride. Why is it that these form hexagonal atomic structures when they themselves aren't hexagonal?
7
-
3$\begingroup$ But they are hexagonal, if you look at them sideways. $\endgroup$– Ivan NeretinCommented Dec 29, 2022 at 14:54
-
$\begingroup$ Sorry I dont quite grasp what you mean. Do you have a visual representation? $\endgroup$– Andi IacobCommented Dec 29, 2022 at 15:01
-
3$\begingroup$ Fcc and hcp structures are similar stacking (fcc you need to look along the 111 body diagonal - a classic issue with the cubic conventional cell). $\endgroup$– Jon CusterCommented Dec 29, 2022 at 15:14
-
$\begingroup$ @AndiIacob for that check my answer to Silver (111) surface structure, and is bulk structure body-center or face-center cubic? Basically the "centered" lattices (fcc, bcc in 3D, centered rectangular in 2D) are contrived to be human friendly; the actual primitive unit cells are much smaller and oblique, and the 3D ones result in horizontal hexagonal planes when the "cubes" are stood up on their corners. $\endgroup$– uhohCommented Dec 30, 2022 at 5:03
-
$\begingroup$ @uhoh so this means there are no modifications needed to the substrate correct? Om effect, any FCC could theoretically be used to make hexagonal shapes? And BCC as well? $\endgroup$– Andi IacobCommented Jan 5, 2023 at 9:54
|
Show 2 more comments
1 Answer
$\begingroup$
$\endgroup$
2
[Ivan Neretin] But they are hexagonal, if you look at them sideways. –
[OP] Sorry I dont quite grasp what you mean. Do you have a visual representation?
Here is the visual.
[Jon Custer] Fcc and hcp structures are similar stacking (fcc you need to look along the 111 body diagonal - a classic issue with the cubic conventional cell).
Yes, both may be constructed by stacking hexagonal layers, either in an ABABA.. (hexagonal close packing hcp) or an ABCABCA.. (face-centered cubic fcc) fashion.
-
-
1