Physical and Electrical Properties of Lead-Free (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3 Ceramics

Wang, Chun Huy

doi:10.4028/www.scientific.net/AMR.239-242.3240

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HomeAdvanced Materials ResearchAdvanced Materials, CEAM 2011Physical and Electrical Properties of Lead-Free...

Physical and Electrical Properties of Lead-Free (Bi_0.5Na_0.5)TiO₃–(Bi_0.5K_0.5)TiO₃ Ceramics

Abstract:

Extending the investigations on (Bi_0.5Na_0.5)TiO₃-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Bi_0.5Na_0.5)TiO₃–(Bi_0.5K_0.5)TiO₃ [BNT-BKT]. (Bi_0.5Na_0.5)TiO₃ with 7~ 30 mol% (Bi_0.5K_0.5)TiO₃ceramics have been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between rhombohedral (R) and tetragonal (T) was found at the composition 0.82BNT-0.18BKT with correspondingly enhanced piezoelectric properties. The electromechanical planar coupling factor is higher for compositions near the MPB. The mechanical quality factor (Q_m), planar coupling coefficient (k_p) and thickness coupling coefficient (k_t) of 0.82BNT-0.18BKT ceramics were 125, 28.8% and 47.4%, respectively.

Info:

Periodical:

Advanced Materials Research (Volumes 239-242)

Main Theme:

Advanced Materials, CEAM 2011

Edited by:

Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He

Pages:

3240-3243

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.3240

Citation:

C. H. Wang, "Physical and Electrical Properties of Lead-Free (Bi_0.5Na_0.5)TiO₃–(Bi_0.5K_0.5)TiO₃ Ceramics", Advanced Materials Research, Vols. 239-242, pp. 3240-3243, 2011

Online since:

May 2011

Authors:

Chun Huy Wang

Keywords:

Dielectric Property, Electromechanical Transducer, Lead-Free Piezoelectric, Piezoelectric Properties, Poling, Sintering

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References

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[28] [49] [1] 0. 99BNT-0. 01CaTiO3 236 37. 6 51. 3.

[2] 0. 98BNT-0. 02BiScO3 431 14. 4.

[3] 0. 87BNT-0. 13(Sr0. 5Ca0. 5)TiO3 583.

[12] [30] [6] 0. 99BNT-0. 01Ba(Ti0. 96Zr0. 04)O3 553.

[14] [51] [7] 0. 98BNT-0. 02Ba(Ti0. 94Sn0. 06)O3 558.

[16] [57] [8] 0. 82BNT-0. 18(Bi0. 5K0. 5)TiO3 630 28. 8.

[47] This study.

Paper TitlePages

Piezoelectric and Dielectric Properties of (Bi_0.5Na_0.5)TiO3- (Bi_0.5K_0.5)TiO₃-BaTiO₃ Lead-Free Piezoelectric Ceramics

Authors: Zhi Wu Chen, Zhen Ya Lu

Abstract: A lead-free piezoelectric ceramic ternary system based on (Bi0.5Na0.5)TiO3 (BNT)-(Bi0.5 K0.5)TiO3(BKT)-BaTiO3(BT) near the morphotropic phase boundary (MPB) between the tetragonal and rhombohedral phases has been investigated. The samples were prepared by a conventional sintering technique. Piezoelectric properties, dielectric properties and microstructures of BNT-BKT-BT lead-free piezoelectric ceramic were studied. The X-ray diffraction (XRD) patterns show that the ceramics possess a single-phase perovskite structure. The measurements of piezoelectric properties reveal that this system has a relatively high piezoelectric performance: the piezoelectric constant d33 reached to 178pC/N and planar electromechanical coupling factor kp enhanced to 0.325. The BNT-BKT-BT ternary system ceramics could be well sintered at 11500C with a high-density ratio of more than 95% of the theoretical density.

Influence MnO₂ on the Properties of (Li_xNa_yK_1-x-y)NbO₃ Ceramics

Authors: Qiang Chen, De Jun Lan, Yi Chen, Du Min Lin, Xi Yue, Ding Quan Xiao, Jian Guo Zhu

Abstract: Lead-free piezoelectric ceramics lithium sodium potassium niobate (LixNayK1-x-y)NbO3 (LNKN100x/100y) have been synthesized by a conventional solid state process. The effects of MnO2 addition on the properties of (LixNayK1-x-y)NbO3(x=0.06, y=0.5)(LNKN6/50) ceramics were investigated. It was found that a morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases is in the composition range 0.05

199

Effect of TiO₂ Nanopowders on the Sintering and Electric Properties of Lead Zirconate Titanate Ceramics

Authors: Guang Hui Li, Zhang Lian Hong, Li Xia Peng, Min Quan Wang

Abstract: XRD, SEM, bulk density and dielectric properties measurements were used to investigate the effect of TiO2 nanopowder substitution for conventional TiO2 micro-powder on the sintering and electric properties of PZT ceramics. Results revealed that the sintering temperature of dense Pb(Zr0.53Ti0.47)O3 ceramics was lowered about 50°C ~ 100°C when 20% and 40% of conventional TiO2 micro-powder was substituted by TiO2 nanopowder. The electric properties were kept or even enhanced in the PZT ceramics adopted the TiO2 nanopowder.

228

Study on Ce and La Doped 0.85NBT-0.144KBT-0.006BT Lead-Free Piezoelectric Ceramics

Authors: Xin You Huang, Chun Hua Gao, Zhi Gang Chen

Abstract: 0.85(Na_0.5Bi_0.5)TiO₃-0.144(K_0.5Bi_0.5)TiO₃-0.006BaTiO₃(0.85NBT-0.144KBT-0.006BT) lead-free piezoelectric ceramics was prepared by conventional ceramic technique. The influence of La₂O₃ doping amount and CeO₂ doping amount on properties , crystal structure and surface topography of 0.85NBT-0.144KBT-0.006BT ceramics were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and other analytic methods. It shows that all compositions show the characteristics of pure perovskite structure solid states, La₂O₃ and CeO₂ doping only changes crystal cell dimension rather than crystal structure. The piezoelectric strain constant (d₃₃) starts increasing and then decreasing, the dielectric constant (ε^T₃₃/ε₀) increases, the dielectric loss (tanδ) starts increasing and then decreasing and then increasing while La₂O₃doping amount increasing. d₃₃ and ε^T₃₃/ε₀ of ceramics starts increasing and then decreasing, tanδ decreases while CeO₂ doping amount increasing . When the La₂O₃doping amount is up to 0.4 wt.%, the doped samples show good performances with d₃₃=151 pC/N, ε^T₃₃/ε₀=1543 and tanδ=4.3%. When the CeO₂ doping amount is 0.1 wt.%, the doped samples show good performances with d₃₃=156 pC/N, ε^T₃₃/ε₀=1364 and tanδ=3.8%. La₂O₃ doping promotes crystal grain growth, CeO₂ doping makes grain crystal size uniform, changes tetragonal into granular structure and restrains crystal grain growth.

2663

Low-Temperature Sintering of ZnO and B₂O₃ Co-Doped (K_0.5Na_0.5)NbO₃ Lead-Free Piezoelectric Ceramics

Authors: Rong Xia Huang, Yu Zhen Zhao, Yong Jie Zhao, Rong Zheng Liu, He Ping Zhou

Abstract: Lead-free K_0.5Na_0.5NbO₃-xwt% (0.4ZnO-0.6B₂O₃) ceramics were synthesized by conventional ceramics process. The co-doping of ZnO and B₂O₃ can decrease the sintering temperature of K_0.5Na_0.5NbO₃ ceramics to 1000°C, and the samples show high relative density around 96%. X-ray diffraction (XRD) reveals that Co-doping of ZnO and B₂O₃ induces lattice distortion. Liquid phase is observed by scanning electron microscopy (SEM), which is resulted from the addition of ZnO and B₂O₃. The ceramics show better piezoelectric and dielectric properties with planar electromechanical coupling factor k_p= 40.7%, piezoelectric constant d₃₃=117pC/N, dielectric constant ε^T₃₃/ε₀=318.6, and loss tangent tanδ=0.034.

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