Compositionally-Complex Fluorite-based Oxides

非技术描述：该项目探索并扩展了一类新的基于萤石晶体结构的复合氧化物，它类似于立方氧化锆宝石，但通常含有五个或更多的金属阳离子。这些新材料可以表现出特殊的性能，例如具有隔热性能，同时具有机械硬度和硬度。这项基础性的研究，是对创造新型陶瓷的一个新的研究领域的探索。新型热障涂层的潜在应用是用于保护飞机、船舶和陆基发电厂的燃气轮机发动机。此外，创造新的隔热陶瓷可以在其他领域产生影响。例如，这些材料可用于提高聚光太阳能发电厂的太阳能热能发电效率和降低成本。该项目为航空航天、国防和能源工业的陶瓷科学和技术的制造相关关键领域培训和指导不同的学生。技术细节：该研究项目将高熵陶瓷（HECs）的新兴领域扩展到使用萤石基氧化物作为模型系统的复合陶瓷（CCCs）。这项研究提供了机会，通过无序和有序之间的相互作用，在一个巨大的组成空间中定制和改善性能。一个核心的科学假设是，CCCs中的无序与有序可以用来定制相稳定性，纳米尺度的非均质性以及热力学性能，其中中熵成分可以优于高熵成分。对疾病、短期和长期秩序、氧空位和异质性的基本理解具有广泛的科学意义。研究生和本科生在陶瓷科学和技术的一个至关重要的支柱领域进行指导和培训。西班牙裔高中生和大学生通过暑期研究项目得到启发和训练。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

NON-TECHNICAL DESCRIPTION: This project explores and expands a new class of compositionally -complex oxides in the fluorite-based crystal structure, which resemble the cubic zirconia gemstone but often contain five or more metal cations. These new materials can exhibit exceptional properties, such as having thermal insulation while being mechanically stiff and hard. This fundamental research delves into a new research field to create new classes of ceramics. Potential applications as new classes of thermal barrier coatings to protect gas turbine engines used in airplanes, ships, and land-based power plants are envisioned. Moreover, creating new thermally insulating ceramics can have impacts in other fields. For example, these materials may be used to increase the efficiency and reduce the cost of solar thermal energy generation in concentrated solar power plants. This project trains and mentors diverse students in a manufacturing-related critical area of ceramic science and technology for the aerospace, defense, and energy industries. TECHNICAL DETAILS: This research project broadens the emerging field of high-entropy ceramics (HECs) to compositionally complex ceramics (CCCs) using the fluorite-based oxides as model systems. This research provides opportunities to tailor and improve properties in a vast compositional space via the interplay between disorder and order. A central scientific hypothesis is that the disorder versus order in CCCs can be utilized to tailor the phase stability, nanoscale heterogeneity, and thermal and mechanical properties, where medium-entropy compositions can outperform their high-entropy counterparts. The fundamental understandings of disorders, short- and long-range orders, oxygen vacancies, and heterogeneity have broad scientific implications. Graduate and undergraduate students are mentored and trained in a critically important mainstay area of ceramic science and technology. Hispanic high school and college students are inspired and trained through summer research projects.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.