Impact of A-site cationic off-stoichiometry on structure-property relationship in the lead-free morphotropic phase boundary system 0.93(Na₀.₅Bi₀.₅TiO₃)-0.07BaTiO₃ (NBT-7BT)

1. V.V. Shvartsman, D.C. Lupascu, Lead-free relaxor ferroelectrics. J. Am. Ceram. Soc. 95(1), 1–26 (2012). https://doi.org/10.1111/j.1551-2916.2011.04952.x10.1111/j.1551-2916.2011.04952.x ↗

2. S. Zhang, B. Malič, J.F. Li, J. Rödel, Lead-free ferroelectric materials: prospective applications. J. Mater. Res. 36(5), 985–995 (2021). https://doi.org/10.1557/s43578-021-00180-y10.1557/s43578-021-00180-y ↗

3. P.K. Panda, Review: environmental friendly lead-free piezoelectric materials. J. Mater. Sci. 44(19), 5049–5062 (2009). https://doi.org/10.1007/s10853-009-3643-010.1007/s10853-009-3643-0 ↗

4. J. Rödel, K.G. Webber, R. Dittmer, W. Jo, M. Kimura, D. Damjanovic, Transferring lead-free piezoelectric ceramics into application. J. Eur. Ceram. Soc. 35(6), 1659–1681 (2015). https://doi.org/10.1016/j.jeurceramsoc.2014.12.01310.1016/j.jeurceramsoc.2014.12.013 ↗

5. L.N. Shi, Y.G. Wang, Z.H. Ren, A. Jain, S.S. Jiang, F.G. Chen, Significant improvement in electrical characteristics and energy storage performance of NBT-based ceramics. Ceram. Int. 48(18), 26973–26983 (2022). https://doi.org/10.1016/j.ceramint.2022.06.00910.1016/j.ceramint.2022.06.009 ↗

6. S. Shanmuga Sundari, B. Kumar, R. Dhanasekaran, Synthesis, dielectric and relaxation behavior of lead free NBT-BT ceramics. Ceram. Int. 39(1), 555–561 (2013). https://doi.org/10.1016/j.ceramint.2012.06.06310.1016/j.ceramint.2012.06.063 ↗

7. S.R. Kanuru, K. Baskar, R. Dhanasekaran, Synthesis, structural, morphological and electrical properties of NBT-BT ceramics for piezoelectric applications. Ceram. Int. 42(5), 6054–6064 (2016). https://doi.org/10.1016/j.ceramint.2015.12.16210.1016/j.ceramint.2015.12.162 ↗

8. S. Jayasri, S. Anwar, Evaluating energy harvesting and different functional properties of microwave synthesized NBT-KNN binary solid solution. J. Alloys Compd. 1021, 179601 (2025). https://doi.org/10.1016/j.jallcom.2025.17960110.1016/j.jallcom.2025.179601 ↗

9. S. Sayyad, S. Acharya, Low temperature synthesis of complex solid solution (1-x)Bi0.5Na0.5TiO3–xBaTiO3 system: BT induced structural and dielectric anomalies in NBT. Ferroelectrics 537(1), 112–132 (2018). https://doi.org/10.1080/00150193.2018.152895010.1080/00150193.2018.1528950 ↗

10. K.S.K.R. Chandra Sekhar, M.L.V. Mahesh, T. Sreenivasu, Y. Rama Krishna, K. Chandra Mouli, P. Tirupathi, Structural evolution, dielectric relaxation and modulus spectroscopic studies in dy substituted NBT-BT ferroelectric ceramics. J. Mater. Sci. Mater. Electron. 32(7), 8628–8647 (2021). https://doi.org/10.1007/s10854-021-05506-410.1007/s10854-021-05506-4 ↗

11. R. Garg, B.N. Rao, A. Senyshyn, P.S.R. Krishna, R. Ranjan, Lead-free piezoelectric system (Na0.5Bi0.5)TiO3-BaTiO3: equilibrium structures and irreversible structural transformations driven by electric field and mechanical impact. Phys. Rev. B 88(1), 014103 (2013). https://doi.org/10.1103/PhysRevB.88.01410310.1103/PhysRevB.88.014103 ↗

12. B.N. Rao, D.K. Khatua, R. Garg, A. Senyshyn, R. Ranjan, Structural crossover from nonmodulated to long-period modulated tetragonal phase and anomalous change in ferroelectric properties in the lead-free piezoelectric Na1/2Bi1/2TiO3-BaTiO3. Phys. Rev. B 91(21), 214116 (2015). https://doi.org/10.1103/PhysRevB.91.21411610.1103/PhysRevB.91.214116 ↗

13. R. Garg, B. Narayana Rao, A. Senyshyn, R. Ranjan, Long ranged structural modulation in the pre-morphotropic phase boundary cubic-like state of the lead-free piezoelectric Na1/2Bi1/2TiO3-BaTiO3. J. Appl. Phys. 114, 234102 (2013). https://doi.org/10.1063/1.484285510.1063/1.4842855 ↗

14. R. Ranjan, A. Dviwedi, Structure and dielectric properties of (Na0.50Bi0.50)1−xBaxTiO3: 0 ≤ x ≤ 0.10. Solid State Commun. 135(6), 394–399 (2005). https://doi.org/10.1016/j.ssc.2005.03.05310.1016/j.ssc.2005.03.053 ↗

15. D.K. Khatua, A. Kalaskar, R. Ranjan, Tuning photoluminescence response by electric field in electrically soft ferroelectrics. Phys. Rev. Lett. 116(11), 117601 (2016). https://doi.org/10.1103/PhysRevLett.116.11760110.1103/PhysRevLett.116.117601 ↗

16. G.F. Nataf, M. Guennou, J.M. Gregg, D. Meier, J. Hlinka, E.K.H. Salje, J. Kreisel, Domain-wall engineering and topological defects in ferroelectric and ferroelastic materials. Nat. Rev. Phys. 2(11), 634–648 (2020). https://doi.org/10.1038/s42254-020-0235-z10.1038/s42254-020-0235-z ↗

17. P.S. Bednyakov, B.I. Sturman, T. Sluka, A.K. Tagantsev, P.V. Yudin, Physics and applications of charged domain walls. NPJ Comput. Mater. 4(1), 65 (2018). https://doi.org/10.1038/s41524-018-0121-810.1038/s41524-018-0121-8 ↗

18. D. Damjanovic, Logarithmic frequency dependence of the piezoelectric effect due to pinning of ferroelectric-ferroelastic domain walls. Phys. Rev. B 55(2), R649 (1997). https://doi.org/10.1103/PhysRevB.55.R64910.1103/PhysRevB.55.R649 ↗

19. G. Catalan, J. Seidel, R. Ramesh, J.F. Scott, Domain wall nanoelectronics. Rev. Mod. Phys. 84(1), 119–156 (2012) https://doi.org/10.1103/RevModPhys.84.11910.1103/RevModPhys.84.119 ↗

20. N. Kumar, D.K. Khatua, B. Mahale, R. Ranjan, Factors influencing the coupling between non-180° domain switching and lattice strain in perovskite piezoceramics. Phys. Rev. B 97(13), 134113 (2018). https://doi.org/10.1103/PhysRevB.97.13411310.1103/PhysRevB.97.134113 ↗

21. X. Liu, S. Xue, F. Wang, J. Zhai, B. Shen, Grain size dependent physical properties in lead-free multifunctional piezoceramics: A case study of NBT-xST system. Acta Mater. 164, 12–24 (2019). https://doi.org/10.1016/j.actamat.2018.10.02910.1016/j.actamat.2018.10.029 ↗

22. A. Mishra, D.K. Khatua, G. Das Adhikary, N. Kumar, U. Shankar, R. Ranjan, Finite-size-effect on a very large length scale in NBT-based lead-free piezoelectrics. J. Adv. Dielectr. 9(05), 1950035 (2019). https://doi.org/10.1142/S2010135X1950035810.1142/S2010135X19500358 ↗

23. J. Hui, Y. Yan, L. Wang, D. Zhang, M. Zhang, M. Zhao, M. Wan, L. Jin, Z. Li, Improving energy storage properties of NN-NBT ceramics through compositional modification. J. Alloys Compd. 989, 174276 (2024). https://doi.org/10.1016/j.jallcom.2024.17427610.1016/j.jallcom.2024.174276 ↗

24. S. Prasertpalichat, T. Siritanon, N. Nuntawong, D.P. Cann, Structural characterization of A-site nonstoichiometric (1 – x)Bi0.5Na0.5TiO3–xBaTiO3 ceramics. J. Mater. Sci. 54(2), 1162–1170 (2019). https://doi.org/10.1007/s10853-018-2939-310.1007/s10853-018-2939-3 ↗

25. I.T. Seo, S. Steiner, T. Frömling, The effect of A site non-stoichiometry on 0.94(NayBix)TiO3-0.06BaTiO3. J. Eur. Ceram. Soc. 37(4), 1429–1436 (2017). https://doi.org/10.1016/j.jeurceramsoc.2016.11.04510.1016/j.jeurceramsoc.2016.11.045 ↗

26. V. Dorcet, G. Trolliard, A transmission electron microscopy study of the A-site disordered perovskite Na0.5Bi0.5TiO3. Acta Mater. 56(8), 1753–1761 (2008). https://doi.org/10.1016/j.actamat.2007.12.02710.1016/j.actamat.2007.12.027 ↗

27. D.P.C. Shih, A. Aguadero, S.J. Skinner, A-site acceptor-doping strategy to enhance oxygen transport in sodium–bismuth–titanate perovskite. J. Amer Ceram. Soc. 106(1), 100–108 (2023). https://doi.org/10.1111/jace.1848310.1111/jace.18483 ↗

28. A. Mishra, G. Abebe, G. Jafo, G. Das Adhikary, A. De, Effect of A-site off-stoichiometry on the microstructural, structural, and electromechanical properties of lead-free tetragonal 0.80Na0.5Bi0.5TiO3–0.20BaTiO3(NBT–20BT) piezoceramic. J Mater. Sci.: Mater. Electron 32(9), 12578–12593 (2021). https://doi.org/10.1007/s10854-021-05895-610.1007/s10854-021-05895-6 ↗

29. A. Mishra, D.K. Khatua, A. De, B. Majumdar, T. Frömling, R. Ranjan, Structural mechanism behind piezoelectric enhancement in off-stoichiometric Na0.5Bi0.5TiO3 based lead-free piezoceramics. Acta Mater. 164, 761–775 (2019). https://doi.org/10.1016/j.actamat.2018.11.01510.1016/j.actamat.2018.11.015 ↗

30. G. Sudha, N. Karunagaran, Superior dielectric stability and dynamic infrared radiation by optimizing the concentration of Nd3+ion in A-site and aliovalent ion in B-site of NBBT ferroelectric perovskite systems. Mater. Sci. Semicond. Process. 175, 108285 (2024). https://doi.org/10.1016/j.mssp.2024.10828510.1016/j.mssp.2024.108285 ↗

31. J. Eom, G. Lee, M. Saleem, M. Ichimura, M.Z. Khan, M.B. Hanif, R.A. Malik, J.H. Koh, Unveiling the dynamics of phase-transition from ferroelectric to relaxor behavior in Nd-doped BNT-based lead-free piezoelectric ceramics. J. Mater. Chem. C 12(48), 19463–19475 (2024). https://doi.org/10.1039/D4TC03664F10.1039/D4TC03664F ↗

32. J. Carter, E. Aksel, T. Iamsasri, J.S. Forrester, J. Chen, J.L. Jones, Structure and ferroelectricity of nonstoichiometric (Na0.5Bi0.5)TiO3. Appl. Phys. Lett. 104, 112904 (2014). https://doi.org/10.1063/1.486810910.1063/1.4868109 ↗

33. B. Malic, Sodium-potassium-niobate based piezoelectric ceramics: processing—microstructure—properties. Jap. J Appl. Phys 63(10), 100801 (2024). https://doi.org/10.35848/1347-4065/ad786210.35848/1347-4065/ad7862 ↗

34. M. Badole, S. Dwivedi, H.N. Vasavan, S. Kumar, The role of salts selection on phase formation and electrical properties of K0.5Bi0.5TiO3 ceramics fabricated via molten salt synthesis. Mater. Chem. Phys. 283, 126017 (2022). https://doi.org/10.1016/j.matchemphys.2022.12601710.1016/j.matchemphys.2022.126017 ↗

35. D. Bremecker, A. Wohninsland, S. Teuber, K.V. Lalitha, M. Hinterstein, J. Rödel, Texture-based ferroelectric hardening in Na1/2Bi1/2TiO3-based piezoceramics. Phys. Rev. Mater. 7(6), 064407 (2023). https://doi.org/10.1103/PhysRevMaterials.7.06440710.1103/PhysRevMaterials.7.064407 ↗

36. K. Datta, R.B. Neder, A. Richter, M. Göbbels, J.C. Neuefeind, B. Mihailova, Adaptive strain prompting a pseudo-morphotropic phase boundary in ferroelectric (1- x)Na0.5Bi0.5TiO3-xBaTiO3. Phys. Rev. B. 97(18), 184101 (2018). https://doi.org/10.1103/PhysRevB.97.18410110.1103/PhysRevB.97.184101 ↗

37. G.C. Ancy, B. Sundarakannan, Effect of post-sintered annealing on the energy storage properties of NBT-6.5BT MPB ceramics. J. Mater. Sci. Mater. Electron. 36(24), 1557 (2025). https://doi.org/10.1007/s10854-025-15604-210.1007/s10854-025-15604-2 ↗

38. J. Schindelin, C.T. Rueden, M.C. Hiner, K.W. Eliceiri, The imageJ ecosystem: an open platform for biomedical image analysis. Mol. Reprod. Dev. 82(7–8), 518–529 (2015). https://doi.org/10.1002/mrd.2248910.1002/mrd.22489 ↗

39. T.J. Collins, I.J. Microscopy, Biotechniques. 43, S25–S30 (2007). https://doi.org/10.2144/00011251710.2144/000112517 ↗

40. B.N. Rao, R. Datta, S.S. Chandrashekaran, D.K. Mishra, V. Sathe, A. Senyshyn, R. Ranjan, Local structural disorder and its influence on the average global structure and polar properties in Na0.5Bi0.5TiO3. Phys. Rev. B Condens. Matter Mater. Phys. 88(22), 224103 (2013). https://doi.org/10.1103/PhysRevB.88.22410310.1103/PhysRevB.88.224103 ↗

41. D.K. Khatua, A. Mishra, N. Kumar, G. Das Adhikary, U. Shankar, B. Majumdar, R. Ranjan, A coupled microstructural-structural mechanism governing thermal depolarization delay in Na0.5Bi0.5TiO3-based piezoelectrics. Acta Mater. 179, 49–60 (2019). https://doi.org/10.1016/j.actamat.2019.08.02210.1016/j.actamat.2019.08.022 ↗

42. H.M. Rietveld, The Rietveld method: a retrospection. Z. Kristallogr. 225, 545–547 (2010). https://doi.org/10.1524/zkri.2010.135610.1524/zkri.2010.1356 ↗

43. L.B. Mccusker, R.B. Von Dreele, D.E. Cox, D. Loue, P. Scardi, Rietveld refinement guidelines. Appl. Crystallogr. 32(1), 36–50 (1999). https://doi.org/10.1107/S002188989800985610.1107/S0021889898009856 ↗

44. H.M. Rietveld, The Rietveld Method-A Historical Perspective. Aust. J. Phys. 41(2), 113–116 (1988). https://doi.org/10.1071/PH88011310.1071/PH880113 ↗

45. X. Chen, H. Ma, W. Pan, M. Pang, P. Liu, J. Zhou, Microstructure, dielectric and ferroelectric properties of (NaxBi0.5)0.94Ba0.06TiO3 lead-free ferroelectric ceramics: effect of Na nonstoichiometry. Mater. Chem. Phys. 132(2–3), 368–374 (2012). https://doi.org/10.1016/j.matchemphys.2011.11.03910.1016/j.matchemphys.2011.11.039 ↗

46. X.S. Qiao, X.M. Chen, H.L. Lian, W.T. Chen, J.P. Zhou, P. Liu, Microstructure and electrical properties of nonstoichiometric 0.94(Na0.5Bi0.5+x)TiO3-0.06BaTiO3 Lead-Free ceramics. J. Am. Ceram. Soc. 99(1), 198–205 (2016). https://doi.org/10.1111/jace.1394110.1111/jace.13941 ↗

47. A. Mishra, D.K. Khatua, A. De, R. Ranjan, Off-stoichiometry, structural-polar disorder and piezoelectricity enhancement in pre-MPB lead-free Na0.5Bi0.5TiO3-BaTiO3 piezoceramic. J. Appl. Phys. 125, 214101 (2019). https://doi.org/10.1063/1.508912310.1063/1.5089123 ↗

48. D.K. Khatua, A. Senyshyn, R. Ranjan, Long-period modulated structure and electric-field-induced structural transformation in Na0.5Bi0.5TiO3-based lead-free piezoelectrics. Phys. Rev. B 93(13), 134106 (2016). https://doi.org/10.1103/PhysRevB.93.13410610.1103/PhysRevB.93.134106 ↗

49. D.K. Khatua, A. Agarwal, N. Kumar, R. Ranjan, Probing local structure of the morphotropic phase boundary composition of Na0.5Bi0.5TiO3–BaTiO3 using rare-earth photoluminescence as a technique. Acta Mater. 145, 429–436 (2018). https://doi.org/10.1016/j.actamat.2017.12.02210.1016/j.actamat.2017.12.022 ↗

50. N. Kumar, A. Mishra, A. De, U. Shankar, R. Ranjan, Factors contributing to the local polar-structural heterogeneity and ultrahigh piezoelectricity in Sm-modified Pb(Mg1/3Nb2/3)O3-PbTiO3. J Phys. D Appl. Phys 53(16), 165302 (2020). https://doi.org/10.1088/1361-6463/ab6ea210.1088/1361-6463/ab6ea2 ↗

51. G. Abebe, G. Jafo, G. Das Adhikary, A. De, R. Ranjan, A. Mishra, Microstructural, structural, dielectric, piezoelectric and energy storage properties of 0.2 wt% MnO2 doped (0.94-x)Na0.5Bi0.5TiO3–0.06BaTiO3-xK0.5Na0.5NbO3 ceramics (0 ≤ x ≤ 0.08). SN Appl. Sci. 2(12), 1935 (2020). https://doi.org/10.1007/s42452-020-03746-310.1007/s42452-020-03746-3 ↗

52. B.N. Rao, L. Olivi, V. Sathe, R. Ranjan, Electric field and temperature dependence of the local structural disorder in the lead-free ferroelectric Na0.5Bi0.5TiO3: an EXAFS study. Phys. Rev. B 93(2), 024106 (2016). https://doi.org/10.1103/PhysRevB.93.02410610.1103/PhysRevB.93.024106 ↗

53. F. Li, B. Wang, X. Gao, D. Damjanovic, L.Q. Chen, S. Zhang, Ferroelectric materials toward next-generation electromechanical technologies. Science. 389(6755), eadn4926 (2025). https://doi.org/10.1126/science.adn492610.1126/science.adn4926 ↗

54. A. Mishra, D.K. Khatua, G. Das Adhikary, N. Kumar, A. Upadhyay, B. Mahale, S. Saha, B. Majumdar, A. Senyshyn, R. Ranjan, Effect of sintering temperature on the structural disorder and its influence on electromechanical properties of the morphotropic phase boundary composition 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 (NBT-6BT). J. Mater. Sci.: Mater. Electron. 32(12), 16088–16103 (2021). https://doi.org/10.1007/s10854-021-06157-110.1007/s10854-021-06157-1 ↗

55. E. Sapper, S. Schaab, W. Jo, T. Granzow, J. Rödel, Influence of electric fields on the depolarization temperature of Mn-doped (1-x)Bi1/2Na1/2TiO3-xBaTiO3. J. Appl. Phys. 111, 014105 (2012). https://doi.org/10.1063/1.367427510.1063/1.3674275 ↗

56. E.M. Anton, W. Jo, D. Damjanovic, J. Rodel, Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics. J. Appl. Phys. 110, 094108 (2011). https://doi.org/10.1063/1.366025310.1063/1.3660253 ↗

57. C. Huang, K. Cai, Y. Wang, Y. Bai, D. Guo, Revealing the real high temperature performance and depolarization characteristics of piezoelectric ceramics by combined: in situ techniques. J. Mater. Chem. C 6(6), 1433–1444 (2018). https://doi.org/10.1039/C7TC04768A10.1039/C7TC04768A ↗

58. A.B. Kounga, S.T. Zhang, W. Jo, T. Granzow, J. Rödel, Morphotropic phase boundary in (1-x)Bi0.5Na0.5TiO3-xK0.5Na0.5NbO3 lead-free piezoceramics. Appl. Phys. Lett. 92, 222902 (2008). https://doi.org/10.1063/1.293806410.1063/1.2938064 ↗

59. U. Shankar, N. Kumar, B. Narayan, D. Swain, A. Senyshyn, R. Ranjan, Large electromechanical response in ferroelectrics: beyond the morphotropic phase boundary paradigm. Phys. Rev. B 100(9), 094101 (2019). https://doi.org/10.1103/PhysRevB.100.09410110.1103/PhysRevB.100.094101 ↗

60. U. Shankar, N. Kumar, G. Ji, M.K. Singh, Comparative analysis of electromechanical performance of morphotropic phase boundary (MPB) based normal ferroelectric and non-MPB based relaxor ferroelectric perovskites. Mater. Today Commun. 42, 111283 (2025). https://doi.org/10.1016/j.mtcomm.2024.11128310.1016/j.mtcomm.2024.111283 ↗

61. C. Ma, H. Guo, S.P. Beckman, X. Tan, Creation and destruction of morphotropic phase boundaries through electrical poling: a case study of lead-free (Bi1/2Na1/2)TiO3-BaTiO3 piezoelectrics. Phys. Rev. Lett. 109(10), 107602 (2012). https://doi.org/10.1103/PhysRevLett.109.10760210.1103/PhysRevLett.109.107602 ↗

62. Z. Zhang, H. Wei, Q. Li, N. Yang, P. Dong, R. Zhang, Z. Liao, Z. Lin, H. Fan, W. Wang, High-entropy and phase engineering induced dislocation networks for improving energy storage in BNT-based ceramics. Ceram. Int. 51, 42211–42219 (2025). https://doi.org/10.1016/j.ceramint.2025.06.43610.1016/j.ceramint.2025.06.436 ↗

63. X. Shi, N. Kumar, M. Hoffman, Electrical fatigue behavior of NBT-BT-xKNN ferroelectrics: effect of ferroelectric phase transformations and oxygen vacancies. J. Mater. Chem. C 8(11), 3887–3896 (2020). https://doi.org/10.1039/C9TC05665C10.1039/C9TC05665C ↗

64. T. Frömling, S. Steiner, A. Ayrikyan, D. Bremecker, M. Dürrschnabel, L. Molina-Luna, H.J. Kleebe, H. Hutter, K.G. Webber, M. Acosta, Designing properties of (Na1/2Bix)TiO3-based materials through A-site non-stoichiometry. J. Mater. Chem. C 6(4), 738–744 (2018). https://doi.org/10.1039/C7TC03975A10.1039/C7TC03975A ↗

65. W. Bai, D. Chen, P. Zheng, J. Zhang, F. Wen, B. Shen, J. Zhai, Z. Ji, Phase transition, switching characteristics of MPB compositions and large strain in lead-free (Bi0.5Na0.5)TiO3-based piezoceramics. J. Alloys Compd. 709, 646–657 (2017). https://doi.org/10.1016/j.jallcom.2017.03.18510.1016/j.jallcom.2017.03.185 ↗

66. J. Gao, X. Hu, Y. Liu, Y. Wang, X. Ke, D. Wang, L. Zhong, X. Ren, Ferroelectric domain walls approaching morphotropic phase boundary. J. Phys. Chem. C 121(4), 2243–2250 (2017). https://doi.org/10.1021/acs.jpcc.6b1159510.1021/acs.jpcc.6b11595 ↗

67. K. Brajesh, K. Tanwar, M. Abebe, R. Ranjan, Relaxor ferroelectricity and electric-field-driven structural transformation in the giant lead-free piezoelectric (Ba,Ca)(Ti,Zr)O3. Phys. Rev. B 92(22), 224112 (2015). https://doi.org/10.1103/PhysRevB.92.22411210.1103/PhysRevB.92.224112 ↗

68. K. Brajesh, M. Abebe, R. Ranjan, Structural transformations in morphotropic-phase-boundary composition of the lead-free piezoelectric system Ba(Ti0.8Zr0.2)O3-(Ba0.7Ca 0.3)TiO3. Phys. Rev. B 94(10), 104108 (2016). https://doi.org/10.1103/PhysRevB.94.10410810.1103/PhysRevB.94.104108 ↗

69. M. Abebe, K. Brajesh, A. Mishra, A. Senyshyn, R. Ranjan, Structural perspective on the anomalous weak-field piezoelectric response at the polymorphic phase boundaries of (Ba, Ca)(Ti, M)O3 lead-free piezoelectrics (M = Zr, Sn, Hf). Phys. Rev. B 96(1), 014113 (2017). https://doi.org/10.1103/PhysRevB.96.01411310.1103/PhysRevB.96.014113 ↗

70. D.P. Nayak, R. Dhurua, G.A. Tina, D. Samantaray, R. Mazumder, A. Mishra, The effect of grain size on the structural, dielectric, ferroelectric, piezoelectric and energy storage properties of lead-free 0.4(Na0.5Bi0.5TiO3)–0.225BaTiO3–0.375BiFeO3 pseudo-ternary ceramics. J. Mater. Sci. : Mater. Electron. 36(19), 1203 (2025). https://doi.org/10.1007/s10854-025-15271-310.1007/s10854-025-15271-3 ↗

71. X. Liu, Y. Zhao, J. Shi, H. Du, X. Xu, H. Lu, J. Che, X. Li, Improvement of dielectric and ferroelectric properties in bismuth sodium titanate based relaxors through Bi non-stoichiometry. J. Alloys Compd 799, 231–238 (2019). https://doi.org/10.1016/j.jallcom.2019.05.32110.1016/j.jallcom.2019.05.321 ↗

72. J. Shi, J. Wang, F. Zhu, W. Tian, W. Hua, H. Fan, J. Yang, L. Liu, X. Liu, Structural insight into the multifunctionality of non-stoichiometric BNT ferroelectrics. J. Mater. Chem. A 12(48), 33834–33843 (2024). https://doi.org/10.1039/D4TA05841K10.1039/D4TA05841K ↗

73. D. Wan, S. Bai, S. Fan, X. Xiang, Z. Li, Y. Liu, P. Kang, L. Zheng, L.D. Zhao, H. Xu, Strain-driven lone pair electron expression for thermal transport in BiCuSeO. Nat. Commun. 16(1), 6284 (2025). https://doi.org/10.1038/s41467-025-61506-610.1038/s41467-025-61506-6 ↗

74. P. Botella, D. Diaz-Anichtchenko, R. Oliva, J. Ibañez, P. Saha, S.N. Achary, F.G. Alabarse, D. Errandonea, High-pressure investigations of ABiO3, A = Y 3+ and Yb3 + type ternary oxides in Bi2O3-A2O3 system. Next Materials 8, 100735 (2025). https://doi.org/10.1016/j.nxmate.2025.10073510.1016/j.nxmate.2025.100735 ↗

75. R. Jhala, N. Patil, D. Shit, V.K. Bupesh Raja, A. Mahapatro, D. Gupta, Phase-field simulation of flash-sintered ceramics: linking sample size and electric field to microstructural homogeneity. Appl. Phys. A 131(7), 590 (2025). https://doi.org/10.1007/s00339-025-08715-410.1007/s00339-025-08715-4 ↗

76. I. Calisir, D.A. Hall, Chemical heterogeneity and approaches to its control in BiFeO3-BaTiO3 lead-free ferroelectrics. J. Mater. Chem. C 6(1), 134–146 (2017). https://doi.org/10.1039/C7TC04122E10.1039/C7TC04122E ↗

77. P. Singh, R. Pandey, P. Singh, Polyol-mediated synthesis of Bi-deficient Mg2+-doped sodium bismuth titanate and study of oxide ion migration behavior with functional properties. J. Alloys Compd. 860, 158492 (2021). https://doi.org/10.1016/j.jallcom.2020.15849210.1016/j.jallcom.2020.158492 ↗

78. N. Kumar, X. Shi, M. Hoffman, Spontaneous relaxor to ferroelectric transition in lead-free relaxor piezoceramics and the role of point defects. J. Eur. Ceram. Soc. 40(6), 2323–2330 (2020). https://doi.org/10.1016/j.jeurceramsoc.2020.01.06610.1016/j.jeurceramsoc.2020.01.066 ↗

79. P. Kabakov, P. Kabakov, C. Dean, V. Kurusingal, Z. Cheng, H.Y. Lee, S. Zhang, Solid-state crystal growth of lead-free ferroelectrics. J. Mater. Chem. C 8(23), 7606–7649 (2020). https://doi.org/10.1039/D0TC01220C10.1039/D0TC01220C ↗

80. G.L. Messing, S. Trolier-McKinstry, E.M. Sabolsky, C. Duran, S. Kwon, B. Brahmaroutu, P. Park, H. Yilmaz, P.W. Rehrig, K.B. Eitel, E. Suvaci, M. Seabaugh, K.S. Oh, Templated grain growth of textured piezoelectric ceramics. Crit. Rev. Solid State Mater. Sci. 29(2), 45–96 (2004). https://doi.org/10.1080/1040843049049090510.1080/10408430490490905 ↗

81. A.M. Babeer, A.F. Ali, A.A. Kamal, A.E. razek Mahmoud, A-site disorder induced ferroelectric to relaxor phase transition of Na(Nb0.75Ti0.25)O3 ceramics by Bi3+ for ultra-high energy storage properties. Materialia 33, 102009 (2024). https://doi.org/10.1016/j.mtla.2024.10200910.1016/j.mtla.2024.102009 ↗