期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 6, 页码 3614-3620出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.01.013
关键词
High-entropy oxides; Pyrochlore-fluorite transformation
资金
- Science Development Foundation of China Academy of Engineering Physics
- National Natural Science Foundation of China [11905194]
This study successfully synthesized 37 kinds of high-entropy pyrochlore/fluorite ceramics, with 33 of them showing a single-phase structure where all cations are randomly distributed. Ionic radii, valence, and size disorder play a key role in the formation of single-phase high-entropy pyrochlore/fluorite oxides. The average radius ratio(rA/rB) is the main factor influencing the phase transformation of pyrochlore/fluorite.
In this study, 37 kinds of high-entropy pyrochlore/fluorite ceramics with equiatomic multicomponent compositions were successfully synthesized and the process of phase transformation was also investigated. Eventually, the experimental results show that 33 among the high-entropy compounds exhibit a single pyrochlore/fluorite structure with all cations randomly and uniformly distributed at A and B sites. Meanwhile, the ionic radii, valence, and size disorder may be the main driving forces for the formation of single-phase high-entropy pyrochlore/fluorite oxides. Furtherly, the average radius ratio(rA/rB) is the main factor of the pyrochlore/fluorite phase transformation. And when the average radius ratio(rA/rB) extends from 1.46 to 1.78, the high-entropy pyrochlore structure is stable. When the average radius ratio rA/rB is less than 1.46, it transforms into the defective fluorite structure. This study not only further expands the high-entropy pyrochlore family and but also is expected to guide the design of high-entropy pyrochlore through composition customization.
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