MnM′X (M′ = Co, Ni; X = Ge, Si, etc.) alloys usually present a large volumetric change during the Martensitic (MA) transformation. This offers a great opportunity for exploring new negative thermal expansion (NTE) materials if the temperature interval of NTE can be extended. Here, we report colossal NTE in fine-powdered Mn0.98CoGe prepared by repeated thermal cycling (TC) through the MA transition or ball milling. Both treatments can expand the MA transformation, and thus broaden the NTE temperature window (ΔT). For the powders that have gone through TC for ten times, ΔT reaches 90 K (309 K–399 K), and the linear expansion coefficient (αL) is about −141 ppm/K, which rank among the largest values of colossal NTE materials. The difference between two kinds of treatments and the possible mechanisms of the extended MA transformation window are discussed based on the introduced strain.
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12 December 2016
Research Article|
December 16 2016
Colossal negative thermal expansion with an extended temperature interval covering room temperature in fine-powdered Mn0.98CoGe
Jianchao Lin;
Jianchao Lin
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Peng Tong;
Peng Tong
a)
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Kui Zhang;
Kui Zhang
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Haiyun Tong;
Haiyun Tong
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Xinge Guo;
Xinge Guo
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Cheng Yang
;
Cheng Yang
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Ying Wu;
Ying Wu
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Meng Wang;
Meng Wang
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Shuai Lin;
Shuai Lin
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Li Chen;
Li Chen
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Wenhai Song;
Wenhai Song
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
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Yuping Sun
Yuping Sun
a)
1Key Laboratory of Materials Physics, Institute of Solid State Physics,
Chinese Academy of Sciences
, Hefei 230031, China
2High Magnetic Field Laboratory,
Chinese Academy of Sciences
, Hefei 230031, China
3Collaborative Innovation Center of Advanced Microstructures,
Nanjing University
, Nanjing 210093, China
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a)
Authors to whom correspondence should be addressed. Electronic addresses: [email protected] and [email protected]
Appl. Phys. Lett. 109, 241903 (2016)
Article history
Received:
September 06 2016
Accepted:
December 02 2016
Citation
Jianchao Lin, Peng Tong, Kui Zhang, Haiyun Tong, Xinge Guo, Cheng Yang, Ying Wu, Meng Wang, Shuai Lin, Li Chen, Wenhai Song, Yuping Sun; Colossal negative thermal expansion with an extended temperature interval covering room temperature in fine-powdered Mn0.98CoGe. Appl. Phys. Lett. 12 December 2016; 109 (24): 241903. https://doi.org/10.1063/1.4972234
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