Resiliency, morphology, and entropic transformations in high-entropy oxide nanoribbons
Hessam Shahbazi, Pardis Seraji, Husam Farraj, Taimin Yang, Allen Kim, Seyyedfaridoddin Fattahpour, Ilias Papailias, Matthew Diamond, Shahriar Namvar, Alireza Ahmadiparidari, Shuxi Wang, Zhenxian Liu, Shihui Feng, Khagesh Kumar, Muhtar Ahart, Jordi Cabana, Sara Kadkhodaei, Junlan Wang, Zhehao Huang, Russell J. Hemley, Amin Salehi‐Khojin
Abstract
We present the successful synthesis and characterization of a one-dimensional high-entropy oxide (1D-HEO) exhibiting nanoribbon morphology. These 1D-HEO nanoribbons exhibit high structural stability at elevated temperatures (to 1000°C), elevated pressures (to 12 gigapascals), and long exposure to harsh acid or base chemical environments. Moreover, they exhibit notable mechanical properties, with an excellent modulus of resilience reaching 40 megajoules per cubic meter. High-pressure experiments reveal an intriguing transformation of the 1D-HEO nanoribbons from orthorhombic to cubic structures at 15 gigapascals followed by the formation of fully amorphous HEOs above 30 gigapascals, which are recoverable to ambient conditions. These transformations introduce additional entropy (structural disorder) besides configurational entropy. This finding offers a way to create low-dimensional, resilient, and high-entropy materials.