1. Large negative thermal expansion in (Ga0.7Cu0.3)1-Mn NMn3 (x≤ 0.4), compensating for the thermal expansion of cryogenic materials
- Author
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W. H. Song, Peng Tong, Kunhao Zhang, J. C. Lin, Cuiyun Yang, Yuxi Sun, Xueping Guo, Mixia Wang, S. Lin, and Yusong Wu
- Subjects
Materials science ,Mechanical Engineering ,Composite number ,Metals and Alloys ,Analytical chemistry ,Intermetallic ,02 engineering and technology ,Epoxy ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Thermal expansion ,0104 chemical sciences ,Thermal conductivity ,Ferromagnetism ,Negative thermal expansion ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,Mn doping ,General Materials Science ,Composite material ,0210 nano-technology - Abstract
As the Mn doping level ( x ) increases in cubic (Ga 0.7 Cu 0.3 ) 1- x Mn x NMn 3 ( x ≤ 0.4) compounds, the temperature window of negative thermal expansion (NTE) is shifted to lower temperatures and broadened due to the strengthening of ferromagnetism. Large coefficient of linear thermal expansion ( α ~ − 22.8 ppm/K) is observed for x = 0.25 and 0.3 at cryogenic temperatures ( x = 0.3 powders, the thermal expansion of epoxy resin is effectively reduced. Nearly zero thermal expansion ( α ~ 1 ppm/K) and remarkably improved thermal conductivity are achieved at cryogenic temperatures in the composite with 50 vol.% addition of the NTE filler.
- Published
- 2017