[ORioN63]

I'm from Portugal. I'm not aware of any difference regarding that word in particular, but tbh I wouldn't know. I'm always surprised with some of the differences I find from time to time.

I can tell you though, that using the word "periferia" is actually common in some place (although a bit rare in most). It's mostly used as a synonym for 'around the borders'.

The example you've mentioned: "move the burgers to the periphery of the barbecue", actually seems perfectly fine. It seems a little bit over-detailed, I guess that a bit context-dependent but I wouldn't bat an eye to the equivalent of "move them to the periphery".

From what I recall 'periferia' is also commonly used in TV news.

[kelnos]

In case it wasn't clear (I don't think anyone has mentioned this, but maybe I missed it), it's not that "periphery" is overly-detailed, it's just an overly-formal, uncommon word. I think the more common phrase would be "move the burgers to the side of the barbecue". "Edge" might also be used too, which is probably a little clearer.