Colossal Negative Thermal Expansion in Ca2RuO4-y (IMAGE)

Nagoya University

Colossal Negative Thermal Expansion in Ca2RuO4-y

Caption

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.

Credit

Koshi Takenaka

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