Journal
APPLIED PHYSICS LETTERS
Volume 87, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2147726
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We report the discovery of a large negative thermal expansion (NTE) up to alpha=-25x10(-6) K-1 (alpha: coefficient of linear thermal expansion) in Ge-doped anti-perovskite manganese nitrides Mn(3)AN (A=Cu,Zn,Ga). This gigantic NTE is several to ten times higher than that of commercially available NTE materials. The discontinuous lattice expansion seen in pure Mn(3)AN is broadened by Ge substitution over a wide temperature window, at widest Delta T similar to 100 K, around room temperature. Such a large, isotropic and nonhysteretic NTE is desirable for practical applications. (c) 2005 American Institute of Physics.
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