Ultrahigh piezoelectric performance benefiting from quasi-isotropic local polarization distribution in complex lead-based perovskite

Giant comprehensive capacitive energy storage in lead-free quasi-linear relaxor ferroelectrics via local heterogeneous polarization configuration

“…These ndings imply the ultrafast reversibility and high dynamics of PNRs in the designed CT-0.4NN ceramic, [66][67][68] which well interpret the strong relaxor characteristic. Meanwhile, the achieved small size of PNRs veries a lowered energy barrier and attened free energy, 69,70 favoring the production of very weak polarization nonlinearity and thus the improvements of ferroelectric behaviors.…”

High‐performance ferroelectric based materials via high‐entropy strategy: Design, properties, and mechanism

“…Recently, a high-entropy strategy to design high piezoelectricity was proposed by introducing ions with different radius and valence states into B-site to regulate polarization configuration, and a series of lead-based systems with outstanding performance of d 33 > 800 pC N À1 was successfully obtained in Pb-based piezoceramics. [63][64][65] With gradually adding B-site elements, an ultrahigh d 33 of $1200 pC N À1 was achieved in a Pb(Ni 0.173 In 0.07 Zr 0.034 Ti 0.306 Nb 0.417 )O 3 composition with five different elements sharing one lattice position (Figure 7A). Meanwhile, the piezoelectric coefficient is strongly correlated with configuration entropy, which proves that the high-entropy strategy is reliable in realizing high piezoelectric performance because of the enhanced disorder degree of B-site (Figure 7B).…”

“…Continuous polarization transitions from R to M to T and plentiful monoclinic phases increase the flexibility of polarization rotation under electric field, thus resulting in a high piezoelectric property. 64 Beyond piezoelectricity, 60,63-66 considerable strides have also been made in ferroelectricity, 53,59,67 relaxor FE behavior, 61 dielectric permittivity and loss, 68,69 and dielectric relaxation 70 in FEs engineering by elevating configuration entropy. For instance, an A-site equimolar (Pb 0.25 Ba 0.25 Sr 0.25 Ca 0.25 )TiO 3 medium-entropy relaxor FE system boasting a configuration entropy of 1.39R demonstrated low loss (<0.015).…”

“…The coexistence of multiple local polar symmetries (R‐M‐T) reduces the free energy barrier and polarization anisotropy, showing a quasi‐isotropic local polarization distribution (Figure 7E,F). Continuous polarization transitions from R to M to T and plentiful monoclinic phases increase the flexibility of polarization rotation under electric field, thus resulting in a high piezoelectric property 64 …”

A synergistic approach to attain high piezoelectricity in a Pb(Ni, Nb)O3–Pb(Lu, Nb)O3–PbTiO3 system

“…17,28 Moreover, the competition between Landau energy and interfacial energies can flatten the free energy distribution and increase the piezoelectric response. 10,29 For example, in compounds of PMN and PNN with a perovskite Pb(B I B II )O 3 structure, there are multiple heterovalent cations at the B-site, which occupy equivalent crystallographic sites and possess both nanoscale ordered and disordered regions, causing local structural heterogeneity. 30 In addition, Li et al have obtained record-high piezoelectric coefficients in ceramics and single crystals, respectively, by introducing a Sm 3+ dopant at the A-site of the PMN-PT lattice, thereby introducing local structural heterogeneity and disrupting long-range ordered ferroelectric domains.…”