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Negative thermal expansion materials: technological key for control of thermal expansion

Author(s): Koshi Takenaka

Journal: Science and Technology of Advanced Materials
ISSN 1468-6996

Volume: 13;
Issue: 1;
Start page: 013001;
Date: 2012;
Original page

Most materials expand upon heating. However, although rare, some materials contract upon heating. Such negative thermal expansion (NTE) materials have enormous industrial merit because they can control the thermal expansion of materials. Recent progress in materials research enables us to obtain materials exhibiting negative coefficients of linear thermal expansion over −30 ppm K−1. Such giant NTE is opening a new phase of control of thermal expansion in composites. Specifically examining practical aspects, this review briefly summarizes materials and mechanisms of NTE as well as composites containing NTE materials, based mainly on activities of the last decade.
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