Negative Thermal Expansion over a Wide Temperature Range in Fe-Doped MnNiGe Composites

Frontiers in Chemistry
Wenjun ZhaoCong Wang

Abstract

Fe-doped MnNiGe alloys were successfully synthesized by solid-state reaction. Giant negative thermal expansion (NTE) behaviors with the coefficients of thermal expansion (CTE) of -285.23 × 10-6K-1(192-305 K) and -1167.09 × 10-6K-1(246-305 K) have been obtained in Mn0.90Fe0.10NiGe and MnNi0.90Fe0.10Ge, respectively. Furthermore, these materials were combined with Cu in order to control the NTE properties. The results indicate that the absolute value of CTE gradually decreases with increasing Cu contents. In Mn0.92Fe0.08NiGe/x%Cu, the CTE gradually changes from -64.92 × 10-6K-1(125-274 K) to -4.73 × 10-6K-1(173-229 K) with increasing value ofxfrom 15 to 70. The magnetic measurements reveal that the NTE behaviors in this work are strongly correlated with the process of the magnetic phase transition and the introduction of Fe atoms could also change the spiral anti-ferromagnetic (s-AFM) state into ferromagnetic (FM) state at low temperature. Our study launches a new candidate for controlling thermal expansion properties of metal matrix materials which could have potential application in variable temperature environment.

References

Oct 21, 2010·Journal of the American Chemical Society·Benjamin K GreveAngus P Wilkinson
Jun 16, 2011·Nature Communications·Masaki AzumaJ Paul Attfield
Jun 24, 2011·Journal of the American Chemical Society·Jun ChenXianran Xing
Jan 9, 2013·Inorganic Chemistry·Ying SunKazunari Yamaura
Jul 28, 2013·Journal of the American Chemical Society·Rongjin HuangLaifeng Li
Jan 30, 2015·Journal of the American Chemical Society·Ying-Ying ZhaoBao-Gen Shen
Jan 11, 2017·Nature Communications·Koshi TakenakaYuki Sakai

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Citations

May 17, 2019·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Trevor W Hambley
Oct 16, 2018·Frontiers in Chemistry·Fengxia HuBaogen Shen
Feb 26, 2021·Environmental Science and Pollution Research International·Baoqing LiWenxiang Wang
May 7, 2019·ACS Applied Materials & Interfaces·Qingyong RenStewart J Campbell

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Methods Mentioned

BETA
scanning electron microscopy
X-ray
AFM

Software Mentioned

MDI jade

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