Phase transition and electrical properties of (1-x)(K1/2Na1/2)NbO3-xBi(Sc3/4Co1/4)O3 lead-free ceramics

Hualei Cheng; Hongliang Du; Wancheng Zhou; Fa Luo

doi:10.1557/jmr.2015.228

Phase transition and electrical properties of (1-x)(K_1/2Na_1/2)NbO_3-xBi(Sc_3/4Co_1/4)O₃ lead-free ceramics

Hualei Cheng, Hongliang Du, Wancheng Zhou, Fa Luo

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Lead-free ceramics (1 - x)(K_1/2Na_1/2)NbO_3-xBi(Sc_3/4Co_1/4)O₃ [(1 - x)KNN-xBSC] were prepared by the conventional solid-state sintering method. X-ray diffraction patterns show that the introduction of BSC into KNN system caused insignificant change in crystal structure. The composition with x = 0.015 has diphasic tetragonal and orthorhombic phases. Moreover, the grain size significantly dependent on the composition. The phase transition temperatures of orthorhombic-tetragonal (T_O-T) and tetragonal-cubic (T_C) decreased with increasing x from 0 to 0.025. The T_O-T value of KNN-0.015BSC ceramic is close to room temperature, resulting in good electrical properties (d₃₃ = 190 pC/N, k_p = 40.3%, ε_r = 1494, tgδ = 0.026), with the Curie temperature T_C = 321 °C. The combination of good piezoelectric properties and high T_C makes these KNN-BSC ceramics suitable for elevated temperature piezoelectric devices.

Original language	English
Pages (from-to)	2467-2473
Number of pages	7
Journal	Journal of Materials Research
Volume	30
Issue number	16
DOIs	https://doi.org/10.1557/jmr.2015.228
State	Published - 7 Aug 2015

Keywords

(KNa)NbO
electrical properties
microstructure
phase transition

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10.1557/jmr.2015.228

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title = "Phase transition and electrical properties of (1-x)(K1/2Na1/2)NbO3-xBi(Sc3/4Co1/4)O3 lead-free ceramics",

abstract = "Lead-free ceramics (1 - x)(K1/2Na1/2)NbO3-xBi(Sc3/4Co1/4)O3 [(1 - x)KNN-xBSC] were prepared by the conventional solid-state sintering method. X-ray diffraction patterns show that the introduction of BSC into KNN system caused insignificant change in crystal structure. The composition with x = 0.015 has diphasic tetragonal and orthorhombic phases. Moreover, the grain size significantly dependent on the composition. The phase transition temperatures of orthorhombic-tetragonal (TO-T) and tetragonal-cubic (TC) decreased with increasing x from 0 to 0.025. The TO-T value of KNN-0.015BSC ceramic is close to room temperature, resulting in good electrical properties (d33 = 190 pC/N, kp = 40.3%, εr = 1494, tgδ = 0.026), with the Curie temperature TC = 321 °C. The combination of good piezoelectric properties and high TC makes these KNN-BSC ceramics suitable for elevated temperature piezoelectric devices.",

keywords = "(KNa)NbO, electrical properties, microstructure, phase transition",

author = "Hualei Cheng and Hongliang Du and Wancheng Zhou and Fa Luo",

note = "Publisher Copyright: Copyright {\textcopyright} Materials Research Society 2015.",

year = "2015",

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AU - Cheng, Hualei

AU - Du, Hongliang

AU - Zhou, Wancheng

AU - Luo, Fa

PY - 2015/8/7

Y1 - 2015/8/7

N2 - Lead-free ceramics (1 - x)(K1/2Na1/2)NbO3-xBi(Sc3/4Co1/4)O3 [(1 - x)KNN-xBSC] were prepared by the conventional solid-state sintering method. X-ray diffraction patterns show that the introduction of BSC into KNN system caused insignificant change in crystal structure. The composition with x = 0.015 has diphasic tetragonal and orthorhombic phases. Moreover, the grain size significantly dependent on the composition. The phase transition temperatures of orthorhombic-tetragonal (TO-T) and tetragonal-cubic (TC) decreased with increasing x from 0 to 0.025. The TO-T value of KNN-0.015BSC ceramic is close to room temperature, resulting in good electrical properties (d33 = 190 pC/N, kp = 40.3%, εr = 1494, tgδ = 0.026), with the Curie temperature TC = 321 °C. The combination of good piezoelectric properties and high TC makes these KNN-BSC ceramics suitable for elevated temperature piezoelectric devices.

AB - Lead-free ceramics (1 - x)(K1/2Na1/2)NbO3-xBi(Sc3/4Co1/4)O3 [(1 - x)KNN-xBSC] were prepared by the conventional solid-state sintering method. X-ray diffraction patterns show that the introduction of BSC into KNN system caused insignificant change in crystal structure. The composition with x = 0.015 has diphasic tetragonal and orthorhombic phases. Moreover, the grain size significantly dependent on the composition. The phase transition temperatures of orthorhombic-tetragonal (TO-T) and tetragonal-cubic (TC) decreased with increasing x from 0 to 0.025. The TO-T value of KNN-0.015BSC ceramic is close to room temperature, resulting in good electrical properties (d33 = 190 pC/N, kp = 40.3%, εr = 1494, tgδ = 0.026), with the Curie temperature TC = 321 °C. The combination of good piezoelectric properties and high TC makes these KNN-BSC ceramics suitable for elevated temperature piezoelectric devices.

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Phase transition and electrical properties of (1-x)(K_1/2Na_1/2)NbO_3-xBi(Sc_3/4Co_1/4)O₃ lead-free ceramics

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