I don't think you will see a lot of diffusion (or any kind of chemical degradation) in a 10 nm (100 angstroms, say ~100 layers of atoms) thick slab. Unless you

I don't think you will see a lot of diffusion (or any kind of chemical degradation) in a 10 nm (100 angstroms, say ~100 layers of atoms) thick slab. Unless you bombard it with a molecular beam, but that'd be really weird and deliberate. Maybe you can get some light atoms (hydrogen) diffusing through it... but not displacing whatever is in their ceramic.