Role of point defects in the formation of relaxor ferroelectrics

• Date:2025-04-30
• Title of Paper:Role of point defects in the formation of relaxor ferroelectrics
• Journal:Acta Materilia
• Summary:Relaxor ferroelectrics are engineered by doping a large amount of point defects into normal ferroelectrics. The point defects create nanoscale compositional heterogeneity, which in turn lead to local Curie temperature (TC) variation and random local electric and strain fields. However, it is still unclear about the individual roles played by each of these effects in converting a normal ferroelectric into a relaxor. In this study we distinguish these effects by carryout computer simulations using the phase field method. We find that although both the local-field and local-TC effects could lead to the formation of nanodomains in relaxors, it is the former that leads to the appearance of Burns temperature TB, the latter that leads to the appearance of the intermediate temperature T*, and a combination of the two allows one to model all three characteristic temperatures of a relaxor reported in experiments: TB, T* and the freezing …
• Co-author:Zhengkai Hong; Xiaoqin Ke; Dong Wang; Sen Yang; Xiaobing Ren; Yunzhi Wang
• Volume:225
• Page Number:117558
• Translation or Not:No
• Date of Publication:2022-02-15