Anomalous expansion materials

Details Anomalous expansion materials Anomalous expansion materials

C - Chemistry, Metallurgy

09

K

C09K 5/02 (2006.01) C01C 3/08 (2006.01) C01C 3/11 (2006.01) C01C 3/12 (2006.01) G02B 1/00 (2006.01) G02B 1/02 (2006.01)

Patent

CA 2491915

A method for controlling the thermal expansion behaviour of a material comprises the step of incorporating into the material a component including one or more diatomic bridges. The or each diatomic bridge extends between two atoms in the component. The method is characterised in that the or each diatomic bridge has at least one vibrational mode that causes the two atoms on either side of the bridge to be moved together to a similar or greater extent than competing vibrational mode(s) that cause the two atoms on either side of the bridge to be moved apart. The bridge may also be polyatomic. New materials and devices comprising a plurality of such diatomic and polyatomic bridges are also defined.

L'invention concerne un procédé destiné à réguler le comportement d'expansion thermique d'un matériau comprenant les étapes consistant à introduire dans ce matériau un composant contenant un ou plusieurs ponts diatomiques. Le ou chaque pont diatomique s'étend entre deux atomes dans le composant. Le procédé est caractérisé en ce que le pont ou chaque pont diatomique possède au moins un mode vibrationnel qui entraîne les deux atomes situés de chaque côté du pont à se déplacer ensemble vers une étendue similaire ou supérieure au(x) mode(s) vibrationnel(s) compétitif(s) faisant s'éloigner les deux atomes de chaque côté du pont. Le pont peut également être polyatomique. L'invention concerne également des matériaux et des dispositifs comprenant plusieurs de ces ponts diatomiques et polyatomiques.

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