DOI number:10.26599/JAC.2024.9220919
Journal:Journal of the Advanced Ceramics
Abstract:When exposed to moderate to high temperatures, nanomaterials typically suffer from severe grain coarsening, which has long been a major concern that prevents their wider applications. Here, we proposed an effective strategy to inhibit grain coarsening by constructing grain boundary (GB) complexions with multiple dopants co-segregated, which hindered coarsening from both energetic and kinetic perspectives. As a demonstration of the feasibility of the strategy, multiple selected dopants were doped to a ZrO2-SiO2 nanocrystalline glass-ceramic (NCGC) to form GB complexions. Results showed that the NCGC was predominately composed of ZrO2 nanocrystallites (NCs) distributed in an amorphous SiO2 matrix. Ultrathin layers of GB complexions (~2.5 nm) were formed between adjacent ZrO2 NCs and they were crystalline superstructures with dopants co-segregated. In addition, a small amount of quartz solid solution was formed and it adhered to the periphery of ZrO2 NCs and bridged the adjacent NCs, acting as “bridging phase”. The GB complexions and the “bridging phase” and synergistically enhanced the coarsening resistance of ZrO2 NCs up to 1000 ºC. These findings are important for understanding the GB complexions and are expected to provide new insights to design nanomaterials with excellent thermodynamic stability.
Co-author:Gabriel Arcuri, Wenjun Yu, Bohan Wang, Zihua Lei, Ying Deng
First Author:Le Fu*
Correspondence Author:Kathryn Grandfield
Volume:13
Issue:7
Page Number:1060-1071
Translation or Not:no
Links to published journals:https://www.sciopen.com/article/10.26599/JAC.2024.9220919