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Strategies & Market Trends : MDA - Market Direction Analysis

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Dec 5 4:00 PM EST

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To: Webster Groves who wrote (70819)	2/28/2001 10:44:12 PM
From: Zeev Hed	Read Replies (1) of 99985

I think that you will find di-borides impossible to draw like wires, the Niobium based SC have a TC just under 22 K, and 49 K does not get you outside the helium cryogenic regime (hydrogen is too dangerous to handle fro cryogenic purposes, and NEON not as plentyful as helium). The HT-SC have the advantage of working with a TC above liquid nitrogen, yet the difficulties of making wires (and cost) make these still impractical. By the way, the silver is not used withHT-SC for its superconducting properties, only as a "container" for the cuprates, reason, cuprates are hygroscopic like hell, and would destabilize rapidly if not sheathed with a good moisture barrier. It turns out that silver is pretty good (in that it has limited interaction with the cuprates, thus sintering can be conducted "in situ"), but it is not really necessary, it is like shooting a fly with a big cannon. Zeev

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