Polymorphic phase transition and enhanced piezoelectric properties of LiTaO3-modified (Na0.52K0.48) (Nb0.93Sb0.07)O3lead-free ceramics

Doping effect on the lattice parameters, vibration modes, dielectric and piezoelectric properties of LiSbO3, LiTaO3 and LiNbO3 substituted lead-free K0.5Na0.5NbO3 (KNN) ceramics are investigated. All compositions are crystallized in morphotropic phase boundary region. Enhanced piezoelectric and electromechanical response d33 ~176–197 pC/N, kp ~45%–48%, and kt~34%–47% obtained in the doped ceramics are due to the presence of the polymorphic phase transition between orthorhombic and tetragonal phase at room temperature.

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Polymorphic phase transition dependence of piezoelectric properties in (K0.5Na0.5)NbO3–(Bi0.5K0.5)TiO3 lead-free ceramics

Journal of Physics D Applied Physics ◽

10.1088/0022-3727/41/11/115413 ◽

2008 ◽

Vol 41 (11) ◽

pp. 115413 ◽

Cited By ~ 28

Author(s):

Hongliang Du ◽

Wancheng Zhou ◽

Fa Luo ◽

Dongmei Zhu ◽

Shaobo Qu ◽

...

Keyword(s):

Phase Transition ◽

Piezoelectric Properties ◽

Lead Free ◽

Polymorphic Phase Transition ◽

Lead Free Ceramics

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Polymorphic Phase Transition and Piezoelectric Performance of BaTiO3-CaSnO3 Solid Solutions

Actuators ◽

10.3390/act10060129 ◽

2021 ◽

Vol 10 (6) ◽

pp. 129

Author(s):

Qian Wang ◽

Hong-Ze Yan ◽

Xian Zhao ◽

Chun-Ming Wang

Keyword(s):

Phase Transition ◽

Solid Solutions ◽

Room Temperature ◽

Electromechanical Coupling ◽

Piezoelectric Properties ◽

Ferroelectric Properties ◽

Piezoelectric Response ◽

X Ray Diffraction ◽

Polymorphic Phase Transition ◽

Piezoelectric Strain

BaTiO3-based piezoelectric ceramics have attracted considerable attention in recent years due to their tunable phase structures and good piezoelectric properties. In this work, the (1 − x)BaTiO3−xCaSnO3 (0.00 ≤ x ≤ 0.16, abbreviated as BT−xCS) solid solutions, were prepared by traditional solid-state reaction methods. The phase transitions, microstructure, dielectric, piezoelectric, and ferroelectric properties of BT-xCS have been investigated in detail. The coexistence of rhombohedral, orthorhombic, and tetragonal phases near room temperature, i.e., polymorphic phase transition (PPT), has been confirmed by X-ray diffraction and temperature-dependent dielectric measurements in the compositions range of 0.06 ≤ x ≤ 0.10. The multiphase coexistence near room temperature provides more spontaneous polarization vectors and facilitates the process of polarization rotation and extension by an external electric field, which is conducive to the enhancement of piezoelectric response. Remarkably, the composition of BT-0.08CS exhibits optimized piezoelectric properties with a piezoelectric coefficient d33 of 620 pC/N, electromechanical coupling factors kp of 58%, kt of 40%, and a piezoelectric strain coefficient d33* of 950 pm/V.

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Effect of orthorhombic–tetragonal phase transition on structure and piezoelectric properties of KNN-based lead-free ceramics

Dalton Transactions ◽

10.1039/c5dt00593k ◽

2015 ◽

Vol 44 (17) ◽

pp. 7797-7802 ◽

Cited By ~ 37

Author(s):

Yang Zhang ◽

Lingyu Li ◽

Bo Shen ◽

Jiwei Zhai

Keyword(s):

Phase Transition ◽

Solid State ◽

Piezoelectric Properties ◽

Solid State Reaction Method ◽

Lead Free ◽

Polymorphic Phase Transition ◽

Conventional Solid State Reaction ◽

Reaction Method ◽

Lead Free Ceramics ◽

Tetragonal Phase Transition

Lead free piezoelectric ceramics have been prepared by the conventional solid state reaction method and the effects of SrZrO3 content on polymorphic phase transition are investigated.

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Phase Structure, Microstructure and Electrical Properties of Lead-Free (1-x) [Na0.515K0.485]0.94Li0.06(Nb0.99Ta0.01)O3 - BiAlO3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.747.781 ◽

2013 ◽

Vol 747 ◽

pp. 781-784 ◽

Cited By ~ 1

Author(s):

Pornsuda Bomlai

Keyword(s):

Phase Transition ◽

Electrical Properties ◽

Phase Structure ◽

Piezoelectric Properties ◽

Perovskite Phase ◽

Lead Free ◽

Cubic Phase ◽

X Ray Diffraction ◽

Polymorphic Phase Transition ◽

Dielectric And Piezoelectric Properties

Lead-free (1-x)[(Na0.515K0.485)0.94Li0.06(Nb0.99Ta0.01)O3]-xBiAlO3 (NKLNT-BA; x = 0, 0.005, 0.010, 0.015, and 0.020) ceramics were fabricated by a conventional mixed-oxide method. The effects of BiAlO3 addition on the phase structure, microstructure and electrical properties of ceramic were then studied. The result indicated that grain size decreased with increasing of BiAlO3 content. In the composition range studied, the perovskite phase with the coexistence of the orthorhombic and tetragonal phases was identified at approximately x 0.005 by the X-ray diffraction analysis and dielectric spectroscopy, which led to a significant enhancement of the piezoelectric properties. The tetragonality increased with further increasing x. The temperature dependence of dielectric properties showed that the addition of BiAlO3 slightly decreased the ferroelectric tetragonal-paraelectric cubic phase transition temperature (TC), but greatly shifted the polymorphic phase transition from the ferroelectric orthorhombic to the ferroelectric tetragonal phase (TOT) to lower room temperature. The dielectric and piezoelectric properties are enhanced for the composition near the orthorhombic-tetragonal polymorphic phase boundary. The unmodified-(Na0.515K0.485)0.94Li0.06(Nb0.99Ta0.01)O3 ceramics exhibit optimum electrical properties (d33 = 225 pC/N and TC = 418°C).

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Effects of sintering temperature on structure and electrical properties of (Na0.48k0.473Li0.04Sr0.007)(Nb0.883Ta0.05Sb0.06Ti0.007)O3 piezoelectric ceramics

Processing and Application of Ceramics ◽

10.2298/pac2101079h ◽

2021 ◽

Vol 15 (1) ◽

pp. 79-86

Author(s):

Cheng-Shong Hong ◽

Yi-Tian Hong

Keyword(s):

Phase Transition ◽

Electrical Properties ◽

Diffuse Phase Transition ◽

Piezoelectric Properties ◽

Sintering Temperature ◽

Piezoelectric Ceramics ◽

Polymorphic Phase Transition ◽

Dielectric And Piezoelectric Properties ◽

Diffuse Phase

In this study, the effects of sintering temperature on microstructure, dielectric and piezoelectric properties are investigated for the non-stoichiometric (Na0.48K0.473Li0.04Sr0.007)(Nb0.883Ta0.05Sb0.06Ti0.007)O3 (NKLNTSST) piezoelectric ceramics. The results suggest that the piezoelectric properties are enhanced owing to the more normal ferroelectric characteristics, higher density, more uniform grains and presence of polymorphic phase transition regions, which are observed with an increase in the sintering temperature up to 1080?C. The piezoelectric properties are weakened owing to the larger degree of diffuse phase transition and more cationoxygen-vacancy pairs with an increase in the sintering temperature above 1080?C. The best piezoelectric properties including kp = 40%, d33 = 288 pC/N, ?max = 72.12, loss = 2.57%, Ec = 13.45 kV/cm and Pr = 10.23 ?C/cm2 are obtained at the sintering temperature of 1080?C.

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Effect of LiNbO3 on Piezoelectric Properties of K0.5Na0.5NbO3 Ceramics

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.2037 ◽

2010 ◽

Vol 654-656 ◽

pp. 2037-2040

Author(s):

Ming He Cao ◽

Zhuo Li ◽

Fan Li ◽

Hua Hao ◽

Han Xing Liu

Keyword(s):

Phase Transition ◽

Solid State ◽

Electrical Properties ◽

Phase Structure ◽

Composition Range ◽

Piezoelectric Properties ◽

Piezoelectric Ceramics ◽

Lead Free ◽

Polymorphic Phase Transition ◽

State Process

Lead-free (1-x)K0.5Na0.5NbO3–xLiNbO3 piezoelectric ceramics have been prepared by a conventional solid state process. The phase structure and the electrical properties of the ceramics were studied. A polymorphic phase transition (PPT) between the orthorhombic and tetragonal phases was identified in the composition range of 0.08<x<0.10. The ceramics near the PPT show better piezoelectric properties. At a level of 10mol% LiNbO3, the sample sintered at 1100oC for 1h exhibits optimal piezoelectric properties.

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