从高熵陶瓷（HEC）到复合陶瓷（CCC）
From High-Entropy Ceramics (HECs) to Compositionally Complex Ceramics (CCCs)
摘要：
这次受邀演讲将回顾我们最近对高熵陶瓷（HECs）和成分复杂陶瓷（CCCs）的一系列研究，并讨论未来的前景。各种单相等摩尔五元（五组分）HEC，例如，已经制造了MB 2、MB、M3 B4、MB 4和MB 6硼化物、MSi 2和M3 Si 5硅化物、钙钛矿、萤石和烧绿石氧化物以及（金属间）铝化物。我们进一步提出将HEC扩展到CCC以包括非等摩尔组成，并进一步考虑短程和长程序，这降低了构型熵，但提供了额外的维度和机会来定制和改善各种性质。我们还报道了第一个双相HEC/CCC。使用组成复杂的萤石基氧化物（CCFBOs，它可以拥有萤石或缺陷萤石，烧绿石，weberite，fergusonite，和方铁锰矿相）作为模型系统，我们最近发现了长和短范围的订单，组成和氧化还原诱导的有序无序转变（ODTs），超高熵weberite和fergusonite相在几个10- 21组分系统。
英文摘要：
This invited talk will review a series of our recent studies on high-entropy ceramics (HECs) and compositionally complex ceramics (CCCs) and discuss the future perspective. Various single-phase equimolar quinary (five-component) HECs, e.g., MB2, MB, M3B4, MB4, and MB6 borides, MSi2 and M3Si5 silicides, perovskite, fluorite, and pyrochlore oxides, and (intermetallic) aluminides have been fabricated. We further proposed to extend HECs to CCCs to include non-equimolar compositions and further consider short- and long-range orders, which reduce configurational entropies but offer additional dimensions and opportunities to tailor and improve various properties. We also reported the first dual-phase HECs/CCCs. Using compositionally complex fluorite-based oxides (CCFBOs, which can possess fluorite or defect fluorite, pyrochlore, weberite, fergusonite, and bixbyite phases) as the model systems, we have recently discovered long- and short- range orders, composition- and redox-induced order-disorder transitions (ODTs), and ultrahigh-entropy weberite and fergusonite phases in several 10- to 21-component systems.
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