Piezoelectric and ferroelectric property in Mn-doped 0.69BiFeO3–0.04Bi(Zn1/2Ti1/2)O3–0.27BaTiO3 lead-free piezoceramics

Lead-free MnO doped 0.955K0.5Na0.5NbO3-0.045Bi0.5Na0.5ZrO3(abbreviate as KNN-0.045BNZ) ceramics have been prepared by a conventional solid-state sintering method in a reducing atmosphere. The addition of MnO suppresses grain growth and eliminates the liquid phase. MnO dopant changes the crystalline structures of KNN-0.045BNZ ceramics from the classical Morphotropic Phase Boundary (MPB) with rhombohedral phase (R) and tetragonal phase (T) to the suppressed MPB with R/T phase. The 0.4% MnO doped KNN-0.045BNZ ceramics show an excellent electrical properties with quasi static piezoelectric constantd33=300 pC/N, Curie temperatureTC= 350 °C, insulation resistivity ρ=4.83 × 1011(Ω・cm), and high field piezoelectric constants =438 pm/V (atEmax= 25 kV/cm). The results indicate that the 0.4%Mn doped KNN-0.045BNZ ceramic is a promising lead-free piezoelectric candidate material for commercial applications.

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Improved ferroelectric photovoltaic effect in Mn-doped lead-free K0.5Na0.5NbO3 films

Ceramics International ◽

10.1016/j.ceramint.2018.04.250 ◽

2018 ◽

Vol 44 (12) ◽

pp. 13994-13998 ◽

Cited By ~ 11

Author(s):

Yizhu Sun ◽

Fei Guo ◽

Qingshan Lu ◽

Shifeng Zhao

Keyword(s):

Photovoltaic Effect ◽

Lead Free ◽

Mn Doped

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Enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na0.5Bi0.5TiO3–0.3Sr0.7Bi0.2TiO3 lead-free ferroelectric ceramics

Journal of Materials Research ◽

10.1557/jmr.2020.291 ◽

2020 ◽

pp. 1-10

Author(s):

Jinbo Wang ◽

Huiqing Fan

Keyword(s):

Energy Storage ◽

Fatigue Resistance ◽

Dielectric Response ◽

Lead Free ◽

Ferroelectric Ceramics ◽

Relaxor Behavior ◽

Storage Performance ◽

Energy Storage Properties ◽

Mn Doped ◽

Storage Properties

The validity of Mn element on enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na0.5Bi0.5TiO3–0.3Sr0.7Bi0.2TiO3 lead-free ferroelectric ceramics (BNT–BST–xMn) is certified by doping. The effects of Mn modification on the dielectric behavior, ferroelectric, energy storage properties, and AC impedance are comprehensively investigated. It is found that the average grain size of the ceramics modified by Mn additions is reduced slightly. Moreover, the relaxor properties are evidently enhanced with the increased Mn content. The AC impedance spectra can even better clarify the dielectric response and relaxor behavior. The results suggest that both of the dielectric response and relaxor behavior are determined by defects especially concentration of the oxygen vacancy. The superior energy storage properties are realized at x = 0.05 with an energy storage density (Wrec) of 1.33 J/cm3 as well as energy storage efficiency (η) of 86.2% at 100 kV/cm, accompanied with a superior thermal stability. BNT–BST–5Mn ceramics can maintain a stable energy storage performance within 106 fatigue cycles, indicating an excellent fatigue resistance.

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