Thermal contact to lithium metal
2003; Elsevier BV; Volume: 329-333; Linguagem: Inglês
10.1016/s0921-4526(02)02251-2
ISSN1873-2135
Autores Tópico(s)Physics of Superconductivity and Magnetism
ResumoExperiments at ultra-low temperatures require very low thermal contact resistances, a serious issue even for metallic specimens below 1mK. Customary practices include pressed contacts or welding by some means, e.g. diffusion welding. When dissimilar metals are joined, one must avoid excess formation of an alloy, usually a poor thermal conductor. The most firm contact with possibly deep alloying does not always have the best thermal conductivity. We have studied this problem when pressing lithium metal to contact with copper, silver and gold. The results are surprisingly different—good contacts could be produced only between Li and Cu, not with Li and Ag or Au. This is obviously due to easy alloying of Ag and Au with Li even at room temperature. This information is essential for proper materials choice in our planned experiment on superconductivity and nuclear magnetism on lithium metal.
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