Intrinsic and extrinsic contributions induced by phase transition to piezoelectric response in KNN-based ceramics. - Zhang, Yiting; Song, Xilong; Feng, Jiaqing; Liu, Zixin; Liao, Chen; Zong, QingShuang; Wu, Wenjuan; Wu, Bo; Tao, Hong; Ma, Jian (Journal of Materials Science: Materials in Electronics, 2025)