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this post was submitted on 03 Dec 2024
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That was such a frustrating article. Basically no information on why those metals (minerals?) are needed to manufacture chips and then you get to the end and find out that the U.S. gets half of them from China (but doesn't say where the other half comes from), and they just say that antimony is used in a wide range of products but not where it is also sourced from or how much is from China.
I assume this is not good news, but that was just not very helpful in explaining it.
Long story short, they're silicon doping agents that change the properties of semiconductors. China produces like 90% of these rare earth elements.
Gallium for example is used in the new smaller USB power supplies marketed as GaN gallium nitride, in this case used instead of silicon due to the better thermals at high power and smaller physical size.
Seymour Cray was building a Gallium Arsenide CPU when he left Cray Research.