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To: Zeev Hed who wrote (70837)	3/1/2001 11:18:11 AM
From: Webster Groves	Respond to of 99985

OK, Zeev, thanks for the heads-up. I would say best TC for practical niobium compound is about 15 K (NbN). Although the diborides are not ductile, they can be pressed into "powered wires" also. Their TC of 39 K makes them a great choice for MRI applications where a closed-cycle He-refrigerator can be used - the latter work to 10 K in a slightly complicated 2-stage system, and 30 K is possible in a simpler single stage device. This is good because no more liquid helium will be required and that reduces a lot of safety problems at MRI clinics. -wg