纳米晶材料
材料科学
阳离子聚合
过渡金属
组态熵
热解
动力学
相变
熵(时间箭头)
金属
单相
纳米技术
冶金
化学工程
热力学
高分子化学
有机化学
化学
工程类
物理
催化作用
电气工程
量子力学
作者
Abhishek Sarkar,Ruzica Djenadic,Nandhini J. Usharani,Kevin P. Sanghvi,Venkata Sai Kiran Chakravadhanula,Ashutosh Gandhi,Horst Hahn,Subramshu S. Bhattacharya
标识
DOI:10.1016/j.jeurceramsoc.2016.09.018
摘要
Multicomponent entropy stabilised oxides containing four and five metal elements in equiatomic amounts were successfully synthesised in nanocrystalline form by nebulised spray pyrolysis (NSP), flame spray pyrolysis (FSP) and reverse co-precipitation (RCP) techniques, demonstrating that entropy stabilisation of these recently discovered materials is independent of the synthesis method. Both 4- and 5-cationic systems, (Co,Mg,Ni,Zn)O and (Co,Cu,Mg,Ni,Zn)O, can be stabilised into a single rocksalt structure directly only using NSP, while in FSP and RCP, stabilisation can be achieved after thermal treatment. This result indicates, that in 5-cationic NSP system configurational entropy is high enough to directly stabilise single rocksalt phase at lower temperature, while higher synthesis temperature is required to compensate the lower configurational entropy in 4-cationic system. Retention of single-phase at room temperature indicates sluggish diffusion kinetics, making entropy stabilised phases quenchable.
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