High electrostrictive strain in lead-free relaxors near the morphotropic phas e boundary

• Date:2025-04-30
• Title of Paper:High electrostrictive strain in lead-free relaxors near the morphotropic phas e boundary
• Journal:Acta Materialia
• Summary:Thanks to its small hysteresis, large electrostrictive strain in relaxor ferroelectrics is superior than piezoelectric strain for applications in precision microactuators. Although relaxor ferroelectrics exhibit the largest electrostrictive strain in ceramics, the magnitude of the strain is limited to ∼0.20% at room temperature due to the large amount of non-ferroelectric defects existing in relaxors. In this work, we develop a relaxor with a morphotropic phase boundary (MPB) by doping a rhombohedral (R3m) ferroelectric BaZr0.2Ti0.8O3 into a tetragonal (P4 mm) ferroelectric 0.89Bi0.5Na0.5TiO3-0.11BaTiO3. A high electrostrictive strain of 0.27% is achieved at room temperature in the relaxor sample. Experimental results illustrate that the composition is near the MPB and exhibits the existence of nanodomains, favoring the achievement of high electrostrictive strain. Moreover, phase field simulations show that the high …
• Co-author:Tangyuan Li; Chang Liu; Xiaoqin Ke; Xiao Liu; Liqiang He; Peng Shi; Xiaobing Ren; Yunzhi Wang; Xiaojie Lou
• Volume:182
• Page Number:39-46
• Translation or Not:No
• Date of Publication:2020-01-01