Multi‐scale and time‐resolved structure analysis of relaxor ferroelectric crystals under an electric field.

Lead‐based relaxor ferroelectrics exhibit giant piezoelectric properties owing to their heterogeneous structures. The average and local structures measured by single‐crystal X‐ray diffraction under DC and AC electric fields are reviewed in this article. The position‐dependent local lattice strain and the distribution of polar nanodomains and nanoregions show strong electric field dependence, which contributes to the giant piezoelectric properties. [ABSTRACT FROM AUTHOR]