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_0.2La_0.2Pr_0.2Sm_0.2Y_0.2)O_2−δ HEO according to the deviation of bond angles from the ideal values, and discover a pressure-induced 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.

作为一类新型的具有高化学无序性的多主要成分氧化物，高熵氧化物（HEOs）引起了人们的广泛关注。它们的结构和性质的稳定性和可调谐性具有极大的意义和重要性，但仍不清楚。通过使用原位同步加速器辐射X射线衍射，拉曼光谱，紫外可见吸收光谱和非原位高分辨率透射电子显微镜，这里我们显示了晶体中晶格畸变的存在（Ce _0.2 La _0.2 Pr _0.2 Sm _0.2 Y _0.2）O _2−δHEO根据键合角与理想值的偏差，发现压力引起的晶格畸变（键合角）和带隙的连续调谐。随着键角的连续弯曲，压力最终导致晶格的远程连接性破裂并导致非晶化。减压后可部分恢复非晶态，形成玻璃-纳米陶瓷复合物HEO。这些结果揭示了HEO的结构和特性出乎意料的灵活性，这可能会促进HEO的基本理解和应用。