Enhanced Polarization Fluctuations in PbZr_0.72Sn_0.28O₃Compared to PbZrO₃Single Crystals Studied by Brillouin Light Scattering

Abstract

Acoustic properties of antiferroelectric (AFE) PbZr 0.72 Sn 0.28 O 3 single crystals were investigated in a wide temperature range by Brillouin light scattering spectroscopy. The Brillouin frequency shift of the longitudinal acoustic (LA) mode exhibited three abrupt changes corresponding to the successive phase transitions between the paraelectric, intermediate, antiferroelectric (AFE2) and antiferroelectric (AFE1) phases upon cooling. The change in the LA mode frequency and the damping maximum of PbZr 0.72 Sn 0.28 O 3 were much higher than those of pure PbZrO 3 . This was attributed to enhanced polarization fluctuations caused by increased ferroelectric distortions due to Sn substitution and the proximity to the tricritical point on the phase diagram of PbZr 1-x Sn x O 3 .

Structure variation and energy storage properties of acceptor‐modified PBLZST antiferroelectric ceramics

“…The enhanced ionic bonding in the octahedrons also leads to lattice contraction as confirmed by XRD patterns in Figure . This may account for the enhanced polarization fluctuations, resulting in a notable improvement of the E A , E F , and P max compared with the values for pure ceramic. Considering the complex substitutions of Mn ions, the tolerance factor, the electronegativity, and the P ‐ E loops, the antiferroelectricity is enhanced.…”

The intricate lattice dynamics of perovskite oxides

“…Effect of Sn substitution in the B-site of PZO and PHO has been investigated systematically. Figure 22 shows temperature dependences of the νB and the ΓB, respectively, of the LA mode of PZO, PbZr0.72Sn0.28O3 (PZSO-0.28) measured at the backscattering geometry [61]. The data of PbZr0.78Sn0.…”

Brillouin light scattering in niobium doped lead zirconate single crystal

“…In Nb-doped PZO single crystals, symmetry breaking effect and two transient phases have already been observed above the Curie temperature (T C ) and at temperatures well below T C 10 . Brillouin light scattering experiments in PZO and PbHfO 3 11 , as well as tin-doped compounds 12 , 13 have evidenced distinct acoustic mode anomalies associated with the phase transitions, substantial changes in the speed of sound propagation, and the formation of significant hypersonic damping 12 , 14 . This method is thus promising to analyse the aforementioned local symmetry breaking, both above T C (pre-transitional effects) and below this transition (post-transitional effects), and determine its origin in PZO:Nb.…”