Zero thermal expansion and ferromagnetism in cubic sc1-xMxF3 (M = Ga, Fe) over a wide temperature range

Hu, Lei and Chen, Jun and Fan, Longlong and Ren, Yang and Rong, Yangchun and Pan, Zhao and Deng, Jinxia and Yu, Ranbo and Xing, Xianran (2014) Zero thermal expansion and ferromagnetism in cubic sc1-xMxF3 (M = Ga, Fe) over a wide temperature range. Journal of the American Chemical Society, 136 (39). pp. 13566-13569. ISSN 0002-7863


The rare physical property of zero thermal expansion (ZTE) is intriguing because neither expansion nor contraction occurs with temperature fluctuations. Most ZTE, however, occurs below room temperature. It is a great challenge to achieve isotropic ZTE at high temperatures. Here we report the unconventional isotropic ZTE in the cubic (Sc1-xMx)F3 (M = Ga, Fe) over a wide temperature range (linear coefficient of thermal expansion (CTE), l = 2.34 × 10-7 K-1, 300-900 K). Such a broad temperature range with a considerably negligible CTE has rarely been documented. The present ZTE property has been designed using the introduction of local distortions in the macroscopic cubic lattice by heterogeneous cation substitution for the Sc site. Even though the macroscopic crystallographic structure of (Sc0.85Ga0.05Fe0.1)F3 adheres to the cubic system (Pm3m) according to the results of X-ray diffraction, the local structure exhibits a slight rhombohedral distortion. This is confirmed by pair distribution function analysis of synchrotron radiation X-ray total scattering. This local distortion may weaken the contribution from the transverse thermal vibration of fluorine atoms to negative thermal expansion, and thus may presumably be responsible for the ZTE. In addition, the present ZTE compounds of (Sc1-xMx)F3 can be functionalized to exhibit high-Tc ferromagnetism and a narrow-gap semiconductor feature. The present study shows the possibility of obtaining ZTE materials with multifunctionality in future work.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Jun 2017 04:31
Last Modified: 14 Jun 2017 04:31
Uncontrolled Keywords: Broad temperature ranges; Crystallographic structure; Linear coefficient of thermal expansion; Narrow-gap semiconductors; Negative thermal expansion; Pair distribution function analysis; Synchrotron radiation x-rays; Temperature fluctuation; General; Magnetic Materials; Organic Compounds; Probability Theory; Atomic and Molecular Physics; Particle Accelerators; Materials Science; Clinical and Experimental Biochemistry;
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030399 Macromolecular and Materials Chemistry not elsewhere classified
Fields of Research (2020): 34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340399 Macromolecular and materials chemistry not elsewhere classified
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
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