Realization of ultra-low thermal expansion over a broad temperature interval in Gdx(Dy0.5Ho0.5)1-xCo2 compounds.
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| Title: | Realization of ultra-low thermal expansion over a broad temperature interval in Gdx(Dy0.5Ho0.5)1-xCo2 compounds. |
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| Authors: | Hao, Jia-Zheng1,2 (AUTHOR), Shen, Fei-Ran1,3,4 (AUTHOR), Hu, Feng-Xia1,3,5 (AUTHOR) fxhu@iphy.ac.cn, Zhou, Hou-Bo1,3 (AUTHOR), Yu, Zi-Bing1,3 (AUTHOR), Gao, Yi-Hong1,3 (AUTHOR), Liang, Wen-Hui1,3 (AUTHOR), Qiao, Kai-Ming1,3 (AUTHOR), Wang, Bing-Jie1,3 (AUTHOR), Li, Jia1,3 (AUTHOR), Zhang, Cheng1,3 (AUTHOR), Wang, Jing1,3,6 (AUTHOR), He, Lun-Hua1,4,5 (AUTHOR) lhhe@iphy.ac.cn, Liang, Tian-Jiao4 (AUTHOR), He, Jun2 (AUTHOR), Sun, Ji-Rong1,3,5 (AUTHOR), Shen, Bao-Gen1,3,5 (AUTHOR) shenbg@iphy.ac.cn |
| Source: | Scripta Materialia. Aug2020, Vol. 185, p181-186. 6p. |
| Subjects: | ZTE Corp., Thermal expansion, Rare earth ions, Rare earth metals, Holmium |
| Abstract: | Zero thermal expansion (ZTE) materials, particularly metals, have important applications in precision manufacturing. Here, ultra-low thermal expansion over a significantly broadened temperature interval is realized by tuning Gd content in ferrimagnetic(FIM) Gd x (Dy 0.5 Ho 0.5) 1-x Co 2 compounds. The achieved coefficients of thermal expansion α l ~+1.3 × 10−6K−1 (5-220K), -1.5 × 10−6K−1 (220-280K) for x=0.5 are even better than the well-known ZTE Invar alloy Fe 0.65 Ni 0.35 , while the operation temperature interval is much wider. The origin is closely related to the regulation of magnetostrictive process by rare earth ions along c-axis in the rhombohedral FIM structure. Our work highlights the advantageous ways to generate ultra-low thermal expansion in magnetocaloric materials. Image, graphical abstract [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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