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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 211-212Dielectric and Piezoelectric Properties of...

Dielectric and Piezoelectric Properties of Lead-Free (Na_0.5K_0.5)NbO₃- Bi_0.5(Na_0.85K_0.15)_0.5TiO₃ Ceramics

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Abstract:

Extending the investigations on (Na_0.5K_0.5)NbO₃-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Na_0.5K_0.5)NbO₃–Bi_0.5(Na_0.85K_0.15)_0.5TiO₃ [NKN-BNKT]. (Na_0.5K_0.5)NbO₃ with 2 ~ 6 mol% Bi_0.5(Na_0.85K_0.15)_0.5TiO₃ has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and hexagonal (H) was found at the composition 0.96NKN-0.04BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (K^T₃₃), planar coupling coefficient (k_p) and thickness coupling coefficient (k_t)of 0.96NKN-0.04BNKT ceramics were 1273, 34% and 38%, respectively.

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Periodical:

Advanced Materials Research (Volumes 211-212)

Pages:

152-155

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.211-212.152

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Cite this paper

Online since:

February 2011

Authors:

Chun Huy Wang

Keywords:

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

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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[12] Anon. IRE: Proc. IRE., Vol. 49 (1961), p.1161. Table I. Comparison of properties of NKN ceramics based on the previous reports of various groups. Composition Density (g/cm3) Relative density (%) Dielectric constant kp kt Ref. NKN.

[4] 34.

[96] 4.

30.

41 4.

98NKN-0. 02BaTiO3.

[4] 44.

[98] 4.

29.

38 4.

995NKN-0. 005SrTiO3.

[4] 44.

[98] 4 412.

33.

44 8.

94NKN-0. 06LiNbO3.

[4] 35.

[96] 5.

42.

48 6.

94NKN-0. 06LiTaO3 -- -- 570.

36 -- 7.

995NKN-0. 005CaTiO3.

[4] 4.

[97] 6 553.

42.

38 9.

98NKN-0. 02 Ba(Zr0. 04Ti0. 96)O3.

[4] 28.

[95] 1 875.

30.

55 5.

96(Na0. 5K0. 5)NbO3 –0. 04Bi0. 5(Na0. 85K0. 15)0. 5TiO3.

[4] 44 1273.

34.

38 This study Fig. 1: X-ray diffraction (XRD) patterns of (1-x) Fig. 2: Measured density of (1-x)NKN-xBNKT NKN -xBNKT ceramics. ceramics shown as a functions of x composition. Fig. 4: The kpand kt of (1-x)NKN-xBNKT Fig. 5: The KT33 of (1-x)NKN-xBNKT ceramics ceramics shown as functions of x composition. shown as a functions of x composition. (a) x=0. 02 (b) x=0. 03 (c) x=0. 04 (d) x=0. 05 (e) x=0. 06 Fig. 5 : The microstructure of (1-x)NKN-xBNKT ceramics under different compositions: (a) x=0. 02 (b) x=0. 03 (c) x=0. 04 (d) x=0. 05 and (e) x=0. 06. Bar= 10 um.

DOI: 10.3724/sp.j.1077.2012.00385