Enhanced mechanical properties and atomic-scale mechanisms of ferroelastic domain switching for GdNbO4-La2Zr2O7 materials
Year: 2024
Type: article
Abstract: Optimization of mechanical properties in La 2 Zr 2 O 7 (LZO) ceramics, composites and coatings is an on-going requirement for their practical application. Herein, the contribution of monoclinic (La, Gd)NbO 4 (m-LGNO) enhancement of fracture toughness by ∼56% reveals its capability to be a prominent toughening agent. Due to the ferroelastic nature of LGNO, ferroelastic switching takes place within the stress concentrated regions, giving rise to significant strain energy relaxation. Atomic-scale evidence reveals that ferroelastic 94°/86° domain switching can occur, yielding merged 94° domains and newly formed 86° domains. The relevant strains induced by ferroelastic domain switching are quantified up to 8.06% and 6.20% in shear and normal strain, respectively. Such domain switching strains highlight their contribution to accommodate external mechanical loading for the 50 mol% GNO-LZO composite. The results indicate that the unique ferroelastic nature and 94°/86° ferroelastic domain switching in m-LGNO cooperatively provide a significant toughening effect.
Source: Scripta Materialia
Authors: Xuezhen Cao, Yizhe Li, Ying Chen, Gyn Brewster, David A. Hall, Sarah J. Haigh, João P. Martins, Ping Xiao
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,220
Awards: G1343891439, G2021761746, G3305536412, New direction in high temperature dielectrics: unlocking performance of doped tungsten bronze oxides through mechanistic understanding, G3987529918, G4048582220, G4972452655, G504327055, G5424142534, The Royce: Capitalising on the investment, G715292007, Aerosol Deposition for Manufacturing and Developing Next Generation Dielectric Charge Storage Devices, G8185224989
OpenAlex ID: W4402668522