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Pressure-induced tuning of lattice distortion in a high-entropy oxide

Cheng, Benyuan; Lou, Hongbo; Sarkar, Abhishek; Zeng, Zhidan; Zhang, Fei; Chen, Xiehang; Tan, Lijie; Prakapenka, Vitali; Greenberg, Eran; Wen, Jianguo; Djenadic, Ruzica; Hahn, Horst; Zeng, Qiaoshi

As a new class of multi-principal component oxides with high chemical disorder, high-entropy oxides (HEOs) have attracted much attention. The stability and tunability of their structure and properties are of great interest and importance, but remain unclear. By using in situ synchrotron radiation X-ray diffraction, Raman spectroscopy, ultraviolet–visible absorption spectroscopy, and ex situ high-resolution transmission electron microscopy, here we show the existence of lattice distortion in the crystalline (Ce$_{0.2}$La$_{0.2}$Pr$_{0.2}$Sm$_{0.2}$Y$_{0.2}$)O$_{2−δ }$ HEO according to the deviation of bond angles from the ideal values, and discover a pressureinduced continuous tuning of lattice distortion (bond angles) and band gap. As continuous bending of bond angles, pressure eventually induces breakdown of the long-range connectivity of lattice and causes amorphization. The amorphous state can be partially recovered upon decompression, forming glass–nanoceramic composite HEO. These results reveal the unexpected flexibility of the structure and properties of HEOs, which could promote the fundamental understanding and applications of HEOs.

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Verlagsausgabe §
DOI: 10.5445/IR/1000098712
Veröffentlicht am 07.10.2019
DOI: 10.1038/s42004-019-0216-2
Zitationen: 3
Web of Science
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 2399-3669
KITopen-ID: 1000098712
HGF-Programm 37.01.01 (POF III, LK 01)
Fundamentals and Materials
Erschienen in Communications chemistry
Band 2
Heft 1
Seiten Art. Nr.: 114
Vorab online veröffentlicht am 27.09.2019
Nachgewiesen in Scopus
Web of Science
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