Nagoya University

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A layered ruthenate Ca2RuO4-y ceramic body contracts on heating, or exhibits negative thermal expansion (NTE). The sintered-body structure shows colossal NTE when extremely anisotropic thermal expansion of the crystal grains produces deformation, consuming open spaces (voids) on heating. The total volume change related to NTE reaches 6.7 percent at most, the largest reported so far.
Material Contracts When Heated
The results could provide industrial engineers with a new class of materials that improve equipment performance and prolong lifetimes.
Feb 8th, 2017