Rapid molten salt synthesis of isotropic negative thermal expansion ScF3

Hu, Lei and Chen, Jun and Fan, Longlong and Deng, Jinxia and Yu, Ranbo and Xing, Xianran (2014) Rapid molten salt synthesis of isotropic negative thermal expansion ScF3. Journal of the American Ceramic Society, 97 (4). pp. 1009-1011. ISSN 0002-7820

Abstract

With a simple ReO3-type structure, ScF3 exhibits a rare property of isotropic negative thermal expansion over a large temperature range. In this study, a rapid and low-temperature synthesis route has been developed to prepare pure phase of ScF3 in which NaNO3 or KNO3 as reaction media and Sc(NO3)3 and NH 4HF2 as precursors (i.e., 30 min and 310°C). The sample of ScF3 has relatively regular morphology and shows high crystallinity as well as single-crystalline nature. The type of molten salts has obvious impact on morphologies of the particles. Substituting NaNO3 with KNO3, cubes of ScF3 turns to be nanosticks. The thermal stability of the as-prepared ScF3 was investigated by thermal analysis. Molten salts play a significant role in eliminating the nonstoichiometric impurity of ScF2.76 which is a common impurity during the conventional chemical reaction. This study reveals that molten salt is in favor of preparing those fluorides and relatives which is inert with moisture.


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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 / Department / School: No Faculty
Date Deposited: 14 Jun 2017 04:18
Last Modified: 14 Jun 2017 04:18
Uncontrolled Keywords: High crystallinity; Isotropic negative thermal expansion; Low temperature synthesis; Molten salt synthesis; Non-stoichiometric; Single-crystalline; Temperature range; Type structures; Fluid Flow; Chemistry; Chemical Reactions; Inorganic Compounds; Materials Science;
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1111/jace.12855
URI: http://eprints.usq.edu.au/id/eprint/31964

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