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 Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=5712