Energy storage efficiency ≥ 99.5% achieved in weak-coupling ferroelectric relaxor BaTiO3–Bi(Mg0.5Ti0.5)O3 –Bi(Mg0.5Sn0.5)O3 system. - Guan, Riyu; Chen, Kaiyuan; Han, Feifei; Yuan, Zhi; Wang, Dingyuan; Bai, Yisong; Chen, Xue; Peng, Biaolin; Yan, Shiguang; Yu, Dongyan; Lei, Xiuyun; Liu, Laijun (Journal of Materials Science: Materials in Electronics, 2025)