X-Message-Number: 5712
Date: Wed, 7 Feb 1996 08:16:05 -0600
From:  (Rodney Perkins)
Subject: Re: Fast Freeze

Actually, the yttrium barium copper oxide (YBCO) compound, discovered in
1987, have superconducting properties at liquid nitrogen temperatures (93
degrees Kelvin). The current record is for a the mercury barium calcium
copper oxide (HBCO) compound which superconducts at about 134 K without
pressure. Under hydro-static pressure, this compound superconducts at 164
K, which is freon temperature.

>Many superconductors of electricity are known, but they are never
>superconductors of heat, and they aren't even superconductors
>of electricity until they are already close to liquid nitrogen
>temperatures.

Rodney Perkins (, )
Office of Public Affairs
Texas Center for Superconductivity at the University of Houston


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