Colossal negative thermal expansion in reduced layered ruthenate

Koshi Takenaka (), Yoshihiko Okamoto, Tsubasa Shinoda, Naoyuki Katayama and Yuki Sakai
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Koshi Takenaka: Nagoya University
Yoshihiko Okamoto: Nagoya University
Tsubasa Shinoda: Nagoya University
Naoyuki Katayama: Nagoya University
Yuki Sakai: Kanagawa Academy of Science and Technology

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Large negative thermal expansion (NTE) has been discovered during the last decade in materials of various kinds, particularly materials associated with a magnetic, ferroelectric or charge-transfer phase transition. Such NTE materials have attracted considerable attention for use as thermal-expansion compensators. Here, we report the discovery of giant NTE for reduced layered ruthenate. The total volume change related to NTE reaches 6.7% in dilatometry, a value twice as large as the largest volume change reported to date. We observed a giant negative coefficient of linear thermal expansion α=−115 × 10−6 K−1 over 200 K interval below 345 K. This dilatometric NTE is too large to be attributable to the crystallographic unit-cell volume variation with temperature. The highly anisotropic thermal expansion of the crystal grains might underlie giant bulk NTE via microstructural effects consuming open spaces in the sintered body on heating.

Date: 2017
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DOI: 10.1038/ncomms14102

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