Crystal cages for clean coolers

Article Abstract:

Keppens and team show how new materials can be produced that are dirty and disordered in terms of their heat carrying lattice vibrations, yet they appear clean for electrons performing useful work. Existing theories relating to lattice vibrations cannot easily explain these experiments. There are implications for materials research, and it may be possible to have air conditioned automobiles with no concern about the impact of their usage on the ozone layer.

High temperature materials, Materials at high temperatures

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Localized vibrational modes in metallic solids

Article Abstract:

Cubic compounds called filled skutterudite antimonides have a rare-earth element that is bound weakly and is inside an atomic cage that other atoms have formed. This rare-earth can cause the lattice component of thermal conductivity to drop dramatically, but there is little impact on the compound's electronic properties. Research suggests that local modes are important and are therefore likely to play a part in designs for new thermoelectric materials.

Analysis, Materials research, Thermoelectricity

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Carbon nano-cages created as cubes

Article Abstract:

A novel technique has been developed to create graphitic nano-cages using arc carbon evaporation. The process creates cubes which have up to twenty layers of multiwalled graphitic carbon with edges measuring up to 100 nanometers in length. Transmission electron microscope images of the rectangular parallelepiped graphitic cages are illustrated.

Methods, Nanotechnology

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