Superconductor World Record Jumps to 233K

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24 March 2009
Superconductors.ORG
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40 degrees below zero is cold by any measure. But, in the world of
superconductors it's a
record hot day. Superconductors.ORG herein reports an increase in high-Tc to
233K (-40C, -40F)
through the substitution of thallium into the tin/indium atomic sites of the
X212/2212C structure
that produced a 218 Kelvin superconductor in January of 2009.

The host material producing the 233K signal has the chemical formula
Tl5Ba4Ca2Cu9Oy. One of
several resistance-v-temperature plots used to confirm this new record is shown
above. And a
composite magnetization test, showing the Meissner transition, is shown below
right.

(to see the graphics and read the rest of the story, click the link below)

http://www.superconductors.org/233K.htm