Realizing excellent energy storage properties in Na0.5Bi0.5TiO3-based lead-free relaxor ferroelectrics

Realizing high energy density and efficiency simultaneously in (Bi0.5Na0.5)0.7Sr0.3TiO3-based ceramics via introducing linear dielectric CaTiO3

“…5(a) and S5(e), (f)†], which can be caused by the evolution of low-temperature PNRs. 71 As described in Fig. 4(a) and (b), the T m in this system tends to shift to lower temperature with increasing CT content, indicating the diminished coupling effect of the TiO 6 octahedron and boosted relaxor behavior, which is consistent with the Raman spectral analysis, and is further confirmed by the subsequent phenomenological statistical models.…”

Simultaneous achievement of ultrahigh energy storage density and high efficiency in BiFeO3-based relaxor ferroelectric ceramics via a highly disordered multicomponent design

“…Firstly, diffused phase transition, the frequency-dependence of ε r and the shift of maximum ε r ( ε r,max ) to high temperatures with increasing frequencies could be observed for every composition, confirming the typical relaxor behavior of the ceramics. 16,19 Secondly, the composition-dependent ε r,max value at 10 kHz (Fig. 2(b)) decreased rapidly, and the peak became increasingly broader with increasing KNN content, indicating decreased polar coupling and promoted relaxor behavior.…”

“…The ε r of every composition reduced slightly with increasing frequency, suggesting the dielectric relaxor feature. 19 The temperature-dependent ε r and tan δ of the BLF–BST–KNN ceramics at various frequencies are exhibited in Fig. S2,† and the temperature-dependent ε r and tan δ measured at 10 kHz are depicted in Fig.…”

Excellent energy storage and discharge performances in Na1/2Bi1/2TiO3-based ergodic relaxors by enlarging the [AO12] cages

“…For a perovskite compound, the Raman scattering spectrum can be divided into four bands A, B, C and D, respectively, corresponding to four vibration modes. 29,30 Among them, the bands C and D are associated with the [BO 6 ] octahedron. We deconvoluted the band C into modes C 1 and C 2 by Gaussian function, but the band D is ignored due to the strong diffusiveness.…”

“…Obviously, KBZN addition induces the significant separation of modes C 1 and C 2 , which indicates the enhanced asymmetry of the B-site ions in the octahedron, and implies enhanced local polarization. 30,31 In brief, the KBZN addition results in enhanced local polarization through enlarging the [AO 12 ] cages due to the enlarged [AO 12 ] cages facilitating the off-centering of the B-site cations and finally realizing a large P m .…”