Jaffe B, Cook WR, Jaffe H. Piezoelectric Ceramics. London, UK: Academic Press, 1971.
Gao XY, Cheng ZX, Chen ZB, et al. The mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO3 ceramics. Nat Commun 2021, 12: 881.
Wang XP, Wu JG, Xiao DQ, et al. Giant piezoelectricity in potassium−sodium niobate lead-free ceramics. J Am Chem Soc 2014, 136: 2905–2910.
Zheng T, Wu HJ, Yuan Y, et al. The structural origin of enhanced piezoelectric performance and stability in lead free ceramics. Energy Environ Sci 2017, 10: 528–537.
Rödel J, Li JF. Lead-free piezoceramics: Status and perspectives. MRS Bull 2018, 43: 576–580.
Zheng T, Yu YG, Lei HB, et al. Compositionally graded KNN-based multilayer composite with excellent piezoelectric temperature stability. Adv Mater 2022, 34: 2109175.
Zhang MH, Zhang QH, Yu TT, et al. Enhanced electric-field-induced strains in (K,Na)NbO3 piezoelectrics from heterogeneous structures. Mater Today 2021, 46: 44–53.
Li RC, Sun XX, Lv X, et al. Manipulating temperature stability in KNN-based ceramics via defect design. Acta Mater 2021, 218: 117229.
Liu Q, Zhang YC, Gao J, et al. Practical high-performance lead-free piezoelectrics: Structural flexibility beyond utilizing multiphase coexistence. Natl Sci Rev 2020, 7: 355–365.
Cen ZY, Dong ZH, Xu Z, et al. Improving fatigue properties, temperature stability and piezoelectric properties of KNN-based ceramics via sintering in reducing atmosphere. J Eur Ceram Soc 2021, 41: 4462–4472.
Xu K, Li J, Lv X, et al. Superior piezoelectric properties in potassium−sodium niobate lead-free ceramics. Adv Mater 2016, 28: 8519−8523.
Lv X, Wu JG, Zhang XX. A new concept to enhance piezoelectricity and temperature stability in KNN ceramics. Chem Eng J 2020, 402: 126215.
Cen ZY, Bian SS, Xu Z, et al. Simultaneously improving piezoelectric properties and temperature stability of Na0.5K0.5NbO3 (KNN)-based ceramics sintered in reducing atmosphere. J Adv Ceram 2021, 10: 820–831.
Wang T, Wu C, Xing J, et al. Enhanced piezoelectricity and temperature stability in LaFeO3-modified KNN-based lead-free ceramics. J Am Ceram Soc 2019, 102: 6126–6136.
Yu YG, Shi XM, Xue HY, et al. Electric-field-insensitive temperature stability of strain in KNN multilayer composite ceramics. ACS Appl Mater Inter 2022, 14: 26949–26957.
Song AZ, Liu YX, Feng TY, et al. Simultaneous enhancement of piezoelectricity and temperature stability in KNN-based lead-free ceramics via layered distribution of dopants. Adv Funct Mater 2022, 32: 2204385.
Li P, Zhai JW, Shen B, et al. Ultrahigh piezoelectric properties in textured (K,Na)NbO3-based lead-free ceramics. Adv Mater 2018, 30: 1705171.
Liu Q, Li JF, Zhao L, et al. Niobate-based lead-free piezoceramics: A diffused phase transition boundary leading to temperature-insensitive high piezoelectric voltage coefficients. J Mater Chem C 2018, 6: 1116–1125.
Huang YL, Zhao CL, Wu B, et al. Diffused and successive phase transitions of (K,Na)NbO3-based ceramics with high strain and temperature insensitivity. J Am Ceram Soc 2019, 102: 2648–2657.
Liu WP, Wang HL, Hu WD, et al. Understanding the origin of the high piezoelectric performance of KNN-based ceramics from the perspective of lattice distortion. Ceram Int 2022, 48: 9731–9738.
Damjanovic D. Comments on origins of enhanced piezoelectric properties in ferroelectrics. IEEE T Ultrason Ferr 2009, 56: 1574–1585.
Lin JF, Zhai JW, Wu X, et al. Simultaneously improved transparency, photochromic contrast and Curie temperature via rare-earth ion modification in KNN-based ceramics. Inorg Chem Front 2021, 8: 2027–2035.
Zhang QW, Chen K, Wang LL, et al. A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+ lead-free piezoelectric material with superior water resistance behavior. J Mater Chem C 2015, 3: 5275–5284.
Yamamoto Y, Harada S, Yamamoto D, et al. Printed multifunctional flexible device with an integrated motion sensor for health care monitoring. Sci Adv 2016, 2: e1601473.
Lin C, Wang HJ, Wang P, et al. Smart white lighting and multi-mode optical modulations via photochromism in Dy-doped KNN-based transparent ceramics. J Am Ceram Soc 2021, 104: 903–916.
Liu Y, Bai GX, Lyu YX, et al. Ultrabroadband tuning and fine structure of emission spectra in lanthanide Er-doped ZnSe nanosheets for display and temperature sensing. ACS Nano 2020, 14: 16003–16012.
Wu J, Wu Z, Qian WQ, et al. Electric-field-treatment-induced enhancement of photoluminescence in Er3+-doped (Ba0.95Sr0.05)(Zr0.1Ti0.9)O3 piezoelectric ceramic. Mater Lett 2016, 184: 131–133.
Cui RY, Tang K, Zhu DC, et al. Sm3+-doped KNNS ferroelectric ceramics with enhanced photoluminescence by polarization-field-modulation. J Mater Sci: Mater Electron 2020, 31: 480–487.
Zhai YZ, Du J, Chen C, et al. The photoluminescence and piezoelectric properties of Eu2O3 doped KNN-based ceramics. J Alloys Compd 2020, 829: 154518.
Liu Q, Zhang YC, Gao J, et al. High-performance lead-free piezoelectrics with local structural heterogeneity. Energy Environ Sci 2018, 11: 3531–3539.
Shvartsman VV, Kleemann W, Dec J, et al. Diffuse phase transition in BaTi1−xSnxO3 ceramics: An intermediate state between ferroelectric and relaxor behavior. J Appl Phys 2006, 99: 124111.
Liu C, Xiao DQ, Huang T, et al. Composition induced rhombohedral−tetragonal phase boundary in BaZrO3 modified (K0.445Na0.50Li0.055)NbO3 lead-free ceramics. Mater Lett 2014, 120: 275–278.
Liu Q, Zhu FY, Zhao L, et al. Further enhancing piezoelectric properties by adding MnO2 in AgSbO3-modified (Li,K,Na)(Nb,Ta)O3 lead-free piezoceramics. J Am Ceram Soc 2016, 99: 3670–3676.
Liu Q, Zhang YC, Zhao L, et al. Simultaneous enhancement of piezoelectricity and temperature stability in (K,Na)NbO3-based lead-free piezoceramics by incorporating perovskite zirconates. J Mater Chem C 2018, 6: 10618–10627.
Duong TA, Erkinov F, Aripova M, et al. Ferroelectric-to-relaxor crossover in KNN-based lead-free piezoceramics. Ceram Int 2021, 47: 4925–4932.
Weyland F, Acosta M, Koruza J, et al. Criticality: Concept to enhance the piezoelectric and electrocaloric properties of ferroelectrics. Adv Funct Mater 2016, 26: 7326–7333.
Saito Y, Takao H, Tani T, et al. Lead-free piezoceramics. Nature 2004, 432: 84–87.
Damjanovic D, Demartin M. Contribution of the irreversible displacement of domain walls to the piezoelectric effect in barium titanate and lead zirconate titanate ceramics. J Phys Condens Matter 1997, 9: 4943–4953.
Lin DM, Kwok KW, Chan HLW. Piezoelectric and ferroelectric properties of KxNa1−xNbO3 lead-free ceramics with MnO2 and CuO doping. J Alloys Compd 2008, 461: 273–278.
Zheng LM, Yang LY, Li YR, et al. Origin of improvement in mechanical quality factor in acceptor-doped relaxor-based ferroelectric single crystals. Phys Rev Appl 2018, 9: 064028.
Jing YJ, Zheng LM, Liu FY, et al. A large and anisotropic enhancement of the mechanical quality factor in ternary relaxor-PbTiO3 single crystals. Appl Phys Lett 2021, 118: 182902.
Bennett J, Shrout TR, Zhang SJ, et al. Temperature dependence of the intrinsic and extrinsic contributions in BiFeO3−(K0.5Bi0.5)TiO3−PbTiO3 piezoelectric ceramics. J Appl Phys 2014, 116: 094102.
Sluka T, Tagantsev AK, Damjanovic D, et al. Enhanced electromechanical response of ferroelectrics due to charged domain walls. Nat Commun 2012, 3: 748.
Li F, Lin DB, Chen ZB, et al. Ultrahigh piezoelectricity in ferroelectric ceramics by design. Nat Mater 2018, 17: 349–354.
Li F, Zhang SJ, Yang TN, et al. The origin of ultrahigh piezoelectricity in relaxor-ferroelectric solid solution crystals. Nat Commun 2016, 7: 13807.
Acosta M, Schmitt LA, Molina-Luna L, et al. Core-shell lead-free piezoelectric ceramics: Current status and advanced characterization of the Bi1/2Na1/2TiO3−SrTiO3 system. J Am Ceram Soc 2015, 98: 3405–3422.
Li W, Hao JG, Li W, et al. Electrical properties and luminescence properties of 0.96(K0.48Na0.52)(Nb0.95Sb0.05)− 0.04Bi0.5(Na0.82K0.18)0.5ZrO3−xSm lead-free ceramics. J Adv Ceram 2020, 9: 72–82.
Li W, Wang D, Li XF, et al. Optical temperature sensing properties and thermoluminescence behavior in Er-modified potassium sodium niobate-based multifunctional ferroelectric ceramics. J Mater Chem C 2022, 10: 11891–11902.
Li W, Hao JG, Fu P, et al. High-temperature and long-term stability of Ho-doped potassium sodium niobate-based multifunctional ceramics. Ceram Int 2021, 47: 13391–13401.
Wang JJ, He B, Du Y, et al. Improved electrical properties and luminescence properties of lead-free KNN ceramics via phase transition. J Mater Sci-Mater El 2021, 32: 28819–28829.
Wang K, Yao FZ, Jo W, et al. Temperature-insensitive (K,Na)NbO3-based lead-free piezoactuator ceramics. Adv Funct Mater 2013, 23: 4079–4086.
He K, Zhang LB, Liu Y, et al. Lanthanide ions doped nonhygroscopic La2Mo3O12 microcrystals based on multimode luminescence for optical thermometry. J Alloys Compd 2022, 890: 161918.
Zhao YJ, Bai GX, Huang YQ, et al. Stimuli responsive lanthanide ions doped layered piezophotonic microcrystals for optical multifunctional sensing applications. Nano Energy 2021, 87: 106177.