Zhao Jing-Bo, Du Hong-Liang, Qu Shao-Bo, Zhang Hong-Mei, Xu Zhuo. Effects of A-site equivalence and non-equivalence substitution on polarization properties of K0.5Na0.5NbO3 lead-free piezoelectric ceramicsJ. Acta Physica Sinica, 2011, 60(10): 107701. DOI: 10.7498/aps.60.107701