From IEEE Spectrum, August 26:
China’s Grip on Erbium and Yttrium Could Choke Data-Center Growth
Vital supply chains rest on a couple of really rare rare earths
There are 17 rare earth elements. While almost all of them have vital industrial uses, you could be forgiven for believing, based on news coverage, that there are only four that matter: neodymium, praseodymium, dysprosium, and terbium.
To be sure, those are the essential ingredients in the powerful permanent-magnet motors that go into electric vehicles, heating and cooling systems, appliances, tools, fighter jets, bombs, and many other systems. But the industrial and national-security importance of rare earth elements goes far beyond magnets. Among the 13 other rare earths are two—erbium and yttirum—whose importance is no less vital, and which are now facing a looming geopolitical deadline this November. Depending on how negotiations play out, the post-deadline framework could erode U.S. national security—or redraw U.S.–China trade relations.
Erbium is used in the amplifiers that boost optical signals in the fiber-optic cables that crisscross the planet. Yttrium is a key component of the thermal barrier coatings that protect turbine blades and other structures from blistering heat in jet engines and in the combustion turbines so in demand to power new data centers.
Yttrium is more broadly used than erbium; besides thermal barrier coatings, it is also used in white LED lights and displays, microwave filters, and solid-state lasers, among other applications. Also, “small quantities of yttrium feed into trillions of multilayer ceramic capacitors that keep our electronics world going, including AI data centers,” notes Thomas Kruemmer, a rare-earths consultant based in Singapore.
Erbium and yttrium, Kruemmer writes in an email, are good examples of how “tiny quantities of rare earths can have an outsized impact by enabling core functionality in their respective applications.” Taken together, all of these rare earths “literally affect almost anything we can switch on and off.”....
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