Researchers from Tsinghua University, the Beijing Institute of Technology, the University of Wollongong (Australia), and the Hefei Institutes of Physical Science of the Chinese Academy of Sciences, have achieved an ultrahigh electrostrain of 1.9% in (K, Na)NbO₃ (KNN) lead-free piezoelectric ceramics.

The breakthrough, facilitated by the electron spin resonance (ESR) spectrometer at the Steady High Magnetic Field Experimental Facility (SHMFF), marks a significant advancement in piezoelectric material performance.

The findings are published in Nature Materials.