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Story tips from the US Department of Energy's Oak Ridge National Laboratory, November 2011
Date:11/8/2011

ng magnetic field: Its temperature jumps up. Remove the field and the temperature drops below the starting point. This behavior, known as the magnetocaloric effect, is usually found in ferromagnets, materials that lose their magnetism above a certain temperature. If it can be exploited it will prove very useful in refrigerators and air conditioners that no longer need motorized compressors and special refrigerants. Oak Ridge National Laboratory's Markus Eisenbach and colleagues are using ORNL's Jaguar supercomputer to push forward on a very important part of this puzzle. Using an application that took the 2009 Gordon Bell Prize as the world's most advanced scientific application, Eisenbach's team has been simulating the magnetic properties of promising materials, focusing in particular on the magnetocaloric effect. Its work is detailed in three recent papers in the Journal of Applied Physics. (http://jap.aip.org/resource/1/japiau/v109/i7/p07E161_s1, http://jap.aip.org/resource/1/japiau/v109/i7/p07E138_s1, http://jap.aip.org/resource/1/japiau/v109/i7/p07A942_s1) [Contact: Leo Williams, (865) 574-8891; williamsjl2@ornl.gov]

MATERIALS -- Rebuffing temperatures . . .

Carefully combining materials that shrink when heated with materials that expand creates a material unaffected by extreme temperature. Researchers can apply this concept to satellites that experience drastic temperature changes as they orbit the Earth but must also maintain precise data. Researchers at the California Institute of Technology combined data from Oak Ridge National Laboratory's Spallation Neutron Source with computer modeling to discover the origin of negative thermal expansion from fourth order potentials in cubic scand
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Contact: Ron Walli
wallira@ornl.gov
865-576-0226
DOE/Oak Ridge National Laboratory
Source:Eurekalert

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