Tunable near-zero thermal expansion in the C-doped La(Fe, Si)13 compounds at cryogenic temperatures

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The controllable thermal expansion property gives us a method to design materials with desirable coefficient of thermal expansion. In this paper, we report a tunable zero thermal expansion (ZTE) in C-doped La(Fe, Si)13 compounds over a wide operation-temperature window (77–260 K). The effects of the interstitial C atoms on the thermal expansion and magnetic properties of the LaFe10.0Si3.0Cx (x = 0, 0.2, 0.3, 0.4) compounds were respectively investigated. The further magnetic analysis indicates that the ZTE behaviors of this La(Fe, Si)13-based compounds are attributed to the changes of magnetic exchange couplings because of the introduction of interstitial C atoms.