Structural, microstructural and dielectric characterizations of (<inline-formula><math display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><msub><mrow><mtext>Bi</mtext></mrow><mrow><mn>0</mn><mo class="MathClass-punc">.</mo><mn>5</mn></mrow></msub></math></inline-formula><inline-formula><math display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><msub><mrow><mtext>Na</mtext></mrow><mrow><mn>0</mn><mo class="MathClass-punc">.</mo><mn>5</mn></mrow></msub></math></inline-formula>)TiO<sub>3</sub>based lead-free ferroelectric ceramics

B. R. Moya; A. C. Silva; A. Peláiz-Barranco; J. D. S. Guerra

doi:10.1142/S2010135X21400063

Journal of Advanced Dielectrics, Volume. 11, Issue 3, 2140006(2021)

Structural, microstructural and dielectric characterizations of ( ${Bi}_{0.5}$ ${Na}_{0.5}$ )TiO₃based lead-free ferroelectric ceramics

B. R. Moya^1,2, A. C. Silva¹, A. Peláiz-Barranco³, and J. D. S. Guerra^1、*

Author Affiliations

¹Grupo de Ferroelétricos e Materiais Multifuncionais, Instituto de Física, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais 38408-100, Brazil

²Departamento de Física e Química, UNESP, Campus de Ilha Solteira, São Paulo 15385-000, Brazil

³Grupo de Materiales Ferroicos, Facultad de Física-Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, La Habana 10400, Cuba

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(1– $x)$ ${Bi}_{0.5}$ ${Na}_{0.5}$ TiO₃– $x$ BaTiO₃lead-free ceramics have been obtained from the conventional solid-state reaction sintering method. The structural properties were investigated from X-ray diffraction and Raman spectroscopy techniques. Results revealed well-crystallized ceramic samples with perovskite structure. Microstructural properties, obtained from scanning electron microscopy measurements, have shown high density with very low porosity level. The dielectric response, analyzed as a function of the temperature and several frequencies, showed very broad peaks with a strong frequency dependence of the temperature for the maximum dielectric permittivity for the modified system. Results were analyzed considering the influence of the BaTiO₃ content on the studied physical properties.(1– $x)$ ${Bi}_{0.5}$ ${Na}_{0.5}$ TiO₃– $x$ BaTiO₃lead-free ceramics have been obtained from the conventional solid-state reaction sintering method. The structural properties were investigated from X-ray diffraction and Raman spectroscopy techniques. Results revealed well-crystallized ceramic samples with perovskite structure. Microstructural properties, obtained from scanning electron microscopy measurements, have shown high density with very low porosity level. The dielectric response, analyzed as a function of the temperature and several frequencies, showed very broad peaks with a strong frequency dependence of the temperature for the maximum dielectric permittivity for the modified system. Results were analyzed considering the influence of the BaTiO₃ content on the studied physical properties.

Keywords

BNT dielectric response Lead-free Raman spectroscopy

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B. R. Moya, A. C. Silva, A. Peláiz-Barranco, J. D. S. Guerra. Structural, microstructural and dielectric characterizations of ( ${Bi}_{0.5}$ ${Na}_{0.5}$ )TiO₃based lead-free ferroelectric ceramics[J]. Journal of Advanced Dielectrics, 2021, 11(3): 2140006

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Paper Information

Category: Research Articles

Received: Feb. 5, 2021

Accepted: May. 19, 2021

Published Online: Feb. 22, 2022

The Author Email: Guerra J. D. S. (santos@ufu.br)

DOI:10.1142/S2010135X21400063

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