Investigation of the phase space in lead-free (KxNa1-x)1-yLiy(Nb1-zTaz)O3 ferroelectric ceramics

Henry E. MGBEMERE; Rolf JANSSEN; Gerold A. SCHNEIDER

doi:10.1007/s40145-015-0162-0

Journal of Advanced Ceramics 2015, 4(4): 282-291 https://doi.org/10.1007/s40145-015-0162-0

Research Article |

Open Access | Issue | Published: 20 October 2015

Investigation of the phase space in lead-free (K_xNa_1-_x)_1-_yLi_y(Nb_1-_zTa_z)O₃ ferroelectric ceramics

Show Author's Information Hide Author's Information Henry E. MGBEMERE^{^a^,^b}(

), Rolf JANSSEN^{^b}, Gerold A. SCHNEIDER^{^b}

a Department of Metallurgical & Materials Engineering, University of Lagos, Akoka, Lagos, Nigeria

b Institute of Advanced Ceramics, Hamburg University of Technology, Denickestrasse 15, 21073 Hamburg, Germany

Keywords:

ferroelectrics, high-throughput synthesis, (K_xNa_1-x)NbO₃ (KNN), lead-free ceramics

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MGBEMERE HE, JANSSEN R, SCHNEIDER GA. Investigation of the phase space in lead-free (K_xNa_1-_x)_1-_yLi_y(Nb_1-_zTa_z)O₃ ferroelectric ceramics. Journal of Advanced Ceramics, 2015, 4(4): 282-291. https://doi.org/10.1007/s40145-015-0162-0

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Abstract

A library of ceramic compounds based on the lead-free (K_xNa_1-x)_1-yLi_y(Nb_1-zTa_z)O₃ solid solution has been synthesized and characterized using high-throughput experimentation (HTE) method. The phase space previously reported by Saito and Takao has been expanded to {{x, 0.1, 1.0}, {y, 0, 0.1}, {z, 0, 0.2}}, and new phase boundaries are observed. The relative density values show that with the appropriate sintering temperature, ~92% of the theoretical density can be reached. The relative permittivity values show that with increasing amount of K⁺and Ta⁵⁺, the dielectric constant values increase. The effect of density on the dielectric constant valuesishowever minimal. Resistivity values ranging from 10⁹ to 10¹³ Ω·cm are obtained for the samples. The piezoelectric charge coefficient values for selected compositions show that higher values are obtained close to the phase boundaries rather than away from them. The properties for the ceramic library using the HTE method are generally 15%–20% less than from the conventional method. This method is therefore more suited for screening of sample compositions than for producing samples with high piezoelectric properties.

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Investigation of the phase space in lead-free (K_xNa_1-_x)_1-_yLi_y(Nb_1-_zTa_z)O₃ ferroelectric ceramics

Show Author's information Hide Author's Information Henry E. MGBEMERE^{^a^,^b}(

), Rolf JANSSEN^{^b}, Gerold A. SCHNEIDER^{^b}

a Department of Metallurgical & Materials Engineering, University of Lagos, Akoka, Lagos, Nigeria

b Institute of Advanced Ceramics, Hamburg University of Technology, Denickestrasse 15, 21073 Hamburg, Germany

Abstract

Keywords: ferroelectrics, high-throughput synthesis, (K_xNa_1-x)NbO₃ (KNN), lead-free ceramics

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Acknowledgements

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Publication history

Received: 15 April 2015

Revised: 10 July 2015

Accepted: 14 July 2015

Published: 20 October 2015

Issue date: April 2015

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Acknowledgements

The research leading to these results has received financial support from the Deutsche Forschungs Gemeinschaft (DFG) under Grant No. SCHN 372/16:1-2.

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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.