Figure. (IMAGE)
Caption
In the 1960s, GM coolers used lead (Pb) as the cold storage material, but in the 1990s, the rare-earth metal compound HoCu2 was introduced, and the cooling performance dramatically improved. While the rare-earth-free cold storage material CuFe0.98Al0.02O2 (CFAO) developed in this study has a cooling capacity comparable to them, it leads to sustainable and environmentally friendly cryogenic cooling technologies as the material is composed solely of abundant elements.
Credit
Noriki Terada, National Institute for Materials Science
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