Influence of the sintering temperature on ferroelectric properties of potassium-sodium niobate piezoelectric ceramics

J. A. Cortés; J. Camargo; M. F. Rachia; F. Rubio-Marcos; L. Ramajo; M. Castro; M. A. Ramírez

doi:10.1142/S2010135X21400026

Journal of Advanced Dielectrics, Volume. 11, Issue 3, 2140002(2021)

Influence of the sintering temperature on ferroelectric properties of potassium-sodium niobate piezoelectric ceramics

J. A. Cortés¹, J. Camargo^2、*, M. F. Rachia¹, F. Rubio-Marcos^3,4, L. Ramajo², M. Castro², and M. A. Ramírez¹

¹Sao Paulo State University — UNESP, Faculty of Engineering of Guaratingueta. Av., Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, 12516-410, Guaratingueta, SP, Brazil

²Research Institute for Materials Science and Technology, INTEMA, Av. Colon 10850, B7608FDQ, Mar del Plata, Argentina

³Electroceramics Department, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049, Madrid, Spain

⁴Escuela Politécnica Superior. Universidad Antonio de Nebrija, Pirineos 55, 28040, Madrid, Spain

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The effect of sintering condition on structure, microstructure, and ferroelectric properties of ( $K_{0.44}$ ${Na}_{0.52}$ ${Li}_{0.04})$ ( ${Nb}_{0.86}$ ${Ta}_{0.10}$ ${Sb}_{0.04})$ - O₃ (KNL–NTS) has been investigated. Ceramic powders have been synthesized by the solid-state reaction method and sintered at different temperatures (1115 $^{\circ}$ C, 1125 $^{\circ}$ C, and 1140 $^{\circ}$ C). Then, samples were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. Through XRD results, the perovskite structure and small peaks corresponding to a secondary phase were detected. Ceramics processed at the highest temperatures showed higher densities and good piezoelectric properties ( $d_{33}$ , $K_{p}$ , and $K_{t})$ , particularly specimens sintered at 1125 $^{\circ}$ C presented the highest piezoelectric performance.The effect of sintering condition on structure, microstructure, and ferroelectric properties of ( $K_{0.44}$ ${Na}_{0.52}$ ${Li}_{0.04})$ ( ${Nb}_{0.86}$ ${Ta}_{0.10}$ ${Sb}_{0.04})$ - O₃ (KNL–NTS) has been investigated. Ceramic powders have been synthesized by the solid-state reaction method and sintered at different temperatures (1115 $^{\circ}$ C, 1125 $^{\circ}$ C, and 1140 $^{\circ}$ C). Then, samples were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. Through XRD results, the perovskite structure and small peaks corresponding to a secondary phase were detected. Ceramics processed at the highest temperatures showed higher densities and good piezoelectric properties ( $d_{33}$ , $K_{p}$ , and $K_{t})$ , particularly specimens sintered at 1125 $^{\circ}$ C presented the highest piezoelectric performance.

Keywords

ferroelectric properties KNL–NTS lead-free

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J. A. Cortés, J. Camargo, M. F. Rachia, F. Rubio-Marcos, L. Ramajo, M. Castro, M. A. Ramírez. Influence of the sintering temperature on ferroelectric properties of potassium-sodium niobate piezoelectric ceramics[J]. Journal of Advanced Dielectrics, 2021, 11(3): 2140002

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Paper Information

Category: Research Articles

Received: Feb. 12, 2021

Accepted: Mar. 31, 2021

Published Online: Feb. 22, 2022

The Author Email: Camargo J. (jcamargo@fi.mdp.edu.ar)

DOI:10.1142/S2010135X21400026

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