[1] Y. Liu, Y. Chang, E. Sun, F. Li, S. Zhang, B. Yang, Y. Sun, J. Wu, W. Cao. Significantly enhanced energy-harvesting performance and superior fatigue-resistant behavior in [001] c-textured BaTiO3-based lead-free piezoceramics. ACS Appl. Mater. Interf., 10, 31488(2018).
[2] L. Yang, H. Huang, Z. Xi, L. Zheng, S. Xu, G. Tian, Y. Zhai, F. Guo, L. Kong, Y. Wang, W. Lu, L. Yuan, M. Zhao, H. Zheng, G. Liu. Simultaneously achieving giant piezoelectricity and record coercive field enhancement in relaxor-based ferroelectric crystals. Nat. Commun., 13, 2444(2022).
[3] L. Bian, X. Qi, K. Li, Y. Yu, L. Liu, Y. Chang, W. Cao, S. Dong. High-performance [001]c-textured PNN-PZT relaxor ferroelectric ceramics for electromechanical coupling devices. Adv. Funct. Mater., 30, 2001846(2020).
[4] S. Yang, J. Li, Y. Liu, M. Wang, L. Qiao, X. Gao, Y. Chang, H. Du, Z. Xu, S. Zhang, F. Li. Textured ferroelectric ceramics with high electromechanical coupling factors over a broad temperature range. Nat. Commun., 12, 1414(2021).
[5] Q. Kou, B. Yang, Y. Sun, S. Yang, L. Liu, H. Xie, Y. Chang, S. Zhang, F. Li. Tetragonal (Ba, Ca) (Zr, Ti)O 3textured ceramics with enhanced piezoelectric response and superior temperature stability. J. Materiomics, 8, 366(2021).
[6] K. Xu, J. Li, X. Lv, J. Wu, X. Zhang, D. Xiao, J. Zhu. Superior piezoelectric properties in potassium-sodium niobate lead-free ceramics. Adv. Mater., 28, 8519(2016).
[7] J. Fu, R. Zuo. Structural evidence for the polymorphic phase boundary in (Na,K)NbO3 based perovskites close to the rhombohedral-tetragonal phase coexistence zone. Acta Mater., 195, 571(2020).
[8] J. F. Li, K. Wang, F. Y. Zhu, L. Q. Cheng, F. Z. Yao, D. J. Green. (K,Na)NbO3-based lead-free piezoceramics: Fundamental aspects, processing technologies, and remaining challenges. J. Am. Ceram. Soc., 96, 3677(2013).
[9] X. Liu, X. Tan. Giant strains in non-textured (Bi1/2Na1/2)TiO 3-based lead-free ceramics. Adv. Mater., 28, 574(2016).
[10] X. Lv, J. Zhu, D. Xiao, X. X. Zhang, J. Wu. Emerging new phase boundary in potassium sodium-niobate based ceramics. Chem. Soc. Rev., 49, 671(2020).
[11] X. Lv, J. Zhang, Y. Liu, F. Li, X. X. Zhang, J. Wu. Synergetic contributions in phase boundary engineering to the piezoelectricity of potassium sodium niobate lead-free piezoceramics. ACS Appl. Mater. Interf., 12, 39455(2020).
[12] X. Wang, J. Wu, D. Xiao, X. Cheng, T. Zheng, X. Lou, B. Zhang, J. Zhu. New potassium-sodium niobate ceramics with a giant d33. ACS Appl. Mater. Interf., 6, 6177(2014).
[13] W. Yao, J. Zhang, C. Zhou, D. Liu, W. Su. Giant piezoelectricity, rhombohedral-orthorhombic-tetragonal phase coexistence and domain configurations of (K,Na)(Nb,Sb)O3 –BiFeO3–(Bi, Na)ZrO3ceramics. J. Eur. Ceram. Soc., 40, 1223(2020).
[14] X. Lv, J. Wu, D. Xiao, H. Tao, Y. Yuan, J. Zhu, X. Wang, X. Lou. (1-x)(K0.48Na0.52)(Nb0.95−y−zTazSby)O3−xBi0.5(Na0.82K0.18)0.5ZrO3lead-free ceramics: Composition dependence of the phase boundaries and electrical properties. Dalton Trans., 44, 4440(2015).
[15] J. Wu, H. Tao, Y. Yuan, X. Lv, X. Wang, X. Lou. Role of antimony in the phase structure and electrical properties of potassium–sodium niobate lead-free ceramics. RSC Adv., 5, 14575(2015).
[16] X. Gao, Z. Cheng, Z. Chen, Y. Liu, X. Meng, X. Zhang, J. Wang, Q. Guo, B. Li, H. Sun, Q. Gu, H. Hao, Q. Shen, J. Wu, X. Liao, S.P. Ringer, H. Liu, L. Zhang, W. Chen, F. Li, S. Zhang. The mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO 3ceramics. Nat. Commun., 12, 881(2021).
[17] J. Wu, D. Xiao, J. Zhu. Potassium-sodium niobate lead-free piezoelectric materials: Past, present, and future of phase boundaries. Chem. Rev., 115, 2559(2015).
[18] Q. Liu, J. F. Li, L. Zhao, Y. Zhang, J. Gao, W. Sun, K. Wang, L. Li. Niobate-based lead-free piezoceramics: A diffused phase transition boundary leading to temperature-insensitive high piezoelectric voltage coefficients. J. Mater. Chem. C, 6, 1116(2018).
[19] Q. Liu, Y. Zhang, J. Gao, Z. Zhou, H. Wang, K. Wang, X. Zhang, L. Li, J. F. Li. High-performance lead-free piezoelectrics with local structural heterogeneity. Energ. Environ. Sci., 11, 3531(2018).
[20] X. Lv, J. Wu, D. Xiao, J. Zhu, X. Zhang. Electric field-induced phase transitions and composition-driven nanodomains in rhombohedral-tetragonal potassium-sodium niobate-based ceramics. Acta Mater., 140, 79(2017).
[21] B. Q. Ming, J. F. Wang, P. Qi, G. Z. Zang. Piezoelectric properties of (Li, Sb, Ta) modified (Na,K)NbO 3lead-free ceramics. J. Appl. Phys., 101, 054103(2007).
[22] H. Tao, H. Wu, Y. Liu, Y. Zhang, J. Wu, F. Li, X. Lyu, C. Zhao, D. Xiao, J. Zhu, S. J. Pennycook. Ultrahigh performance in lead-free piezoceramics utilizing a relaxor slush polar state with multiphase coexistence. J. Am. Chem. Soc., 141, 13987(2019).
[23] S. Wada, H. Kakemoto, T. Tsurumi. Enhanced piezoelectric properties of piezoelectric single crystals by domain engineering. Mater. Trans., 45, 178(2004).
[24] P. Li, Z. Fu, F. Wang, Y. Huan, Z. Zhou, J. Zhai, B. Shen, S. Zhang. High piezoelectricity and stable output in BaHfO 3and (Bi0.5Na0.5)ZrO3modified (K0.5Na0.5)(Nb0.96Sb0.04)O3textured ceramics. Acta Mater., 199, 542(2020).
[25] W. Yang, Y. Wang, P. Li, S. Wu, F. Wang, B. Shen, J. Zhai. Improving electromechanical properties in KNANS-BNZ ceramics by the synergy between phase structure modification and grain orientation. J. Mater. Chem. C, 8, 6149(2020).
[26] Y. Saito, H. Takao, T. Tani. Lead-free piezoceramics. Nature, 432, 84(2004).
[27] P. Li, J. Zhai, B. Shen, S. Zhang, X. Li, F. Zhu, X. Zhang. Ultrahigh piezoelectric properties in textured (K,Na)NbO 3-based lead-free ceramics. Adv. Mater., 30, 1705171(2018).
[28] Y. Chang, J. Wu, B. Yang, H. Xie, S. Yang, Y. Sun, S. Zhang, F. Li, W. Cao. Large, thermally stabilized and fatigue-resistant piezoelectric strain response in textured relaxor-PbTiO 3ferroelectric ceramics. J. Mater. Chem. C, 9, 2008(2021).
[29] K. Wang, F. Z. Yao, W. Jo, D. Gobeljic, V. V. Shvartsman, D. C. Lupascu, J. F. Li, J. Rödel. Temperature-insensitive (K,Na)NbO3-based lead-free piezoactuator ceramics. Adv. Funct. Mater., 23, 4079(2013).
[30] F. Z. Yao, K. Wang, W. Jo, K. G. Webber, T. P. Comyn, J. X. Ding, B. Xu, L. Q. Cheng, M. P. Zheng, Y. D. Hou, J. F. Li. Diffused phase transition boosts thermal stability of high-performance lead-free piezoelectrics. Adv. Funct. Mater., 26, 1217(2016).