| Abstract Scope |
This talk will first review a series of our earlier discoveries of high-entropy ceramics (HECs), including single-phase equimolar five-component MB2, MB, M3B4, and MB4 borides, perovskite and YSZ-like fluorite oxides, and MSi2 and M5Si3 silicides, and single-phase high-entropy intermetallic compounds that bridge high-entropy alloys (HEAs) and HECs. In 2020, we further proposed extending HECs to "compositionally complex ceramics (CCCs)", where non-equimolar compositions and the presence of long- or short-range order, although reducing configurational entropy, create new opportunities to tailor and enhance properties, often surpassing those of higher-entropy counterparts. Several emerging directions, including dual-phase CCCs, ultrahigh-entropy phases, and novel processing routes such as ultrafast reactive sintering, will be highlighted. I propose that exploring compositional complexity across vast non-equimolar spaces, together with exploiting correlated disorder, represents a transformative strategy for designing ceramics with superior performance. Please see a recent Perspective article [Journal of Materiomics, 12 (2), 101173 (2026); https://doi.org/10.1016/j.jmat.2026.101173] for related discussion. |
