| http://www.w3.org/ns/prov#value | - The K2 NiF4 -type oxides show such higher Tc as 30 to 50 K., which are extremely higher than the known superconducting materials, and hence it becomes possible to use liquidized hydrogen (b.p.=20.4 K.) or liquidized neon (b.p.=27.3 K.) as a cryogen which can bring them to exhibit the superconductivity.
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