Scholarlink

<p>In this work, impedance spectroscopy (IS) was used to examine the dielectric characteristics of the BiCu<sub>3</sub>Ti<sub>3</sub>FeO<sub>12</sub> ceramic matrix added with bismuth oxide (Bi<sub>2</sub>O<sub>3</sub>) at different concentrations. The presence of new crystalline phases in the composites was investigated using the X-ray analysis (Rietveld refinement method). Impedance spectroscopy (IS) was used to study the dielectric properties of the samples in the radiofrequency region (&lt;300&#xa0;MHz). Furthermore, the IS allowed the study of the nature of the impedances and determined the activation energy (Ea) which show that the additions of Bi<sub>2</sub>O<sub>3</sub> contributed to the increase in the activation energy. The Nyquist diagram was used and, through an equivalent circuit formed by an association with two resistors, each in parallel with a constant phase element (CPE), it was possible to numerically determine the behaviors of the grain and contour grain effects of the ceramic samples. In addition to dielectric analysis, impedance spectroscopy measurements were carried out to study the nature of impedance, and the measured data was also fitted to the famous Cole–Cole spectrum. The contribution of the grain and grain boundary to the resistance and capacitance for Bi<sub>2</sub>O<sub>3</sub> replacement was calculated from the theoretical fitted data. The capacitance coeficient of temperature (TCC) was obtained and its values demonstrate that the Bi<sub>2</sub>O<sub>3</sub> additions caused an increase in the thermal stability of the composites in relation to the pure matrix.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Bi2O3 addition on the dielectric properties in radio frequency range of the BiCu3Ti3FeO12 matrix

  • 期刊论文

  • 发表日期：

    2025年1月24日

查看全文
  • Diego da Mota Colares,
  • Roterdan Fernandes Abreu,
  • Francisco Alekson Chaves Nobrega,
  • João Paulo Costa do Nascimento,
  • Daniel Barros de Freitas,
  • Felipe Felix do Carmo,
  • Tallison Oliveira Abreu,
  • Marcelo Antonio Santos da Silva,
  • Ronaldo Santos da Silva,
  • Antonio Sérgio Bezerra Sombra

摘要

In this work, impedance spectroscopy (IS) was used to examine the dielectric characteristics of the BiCu3Ti3FeO12 ceramic matrix added with bismuth oxide (Bi2O3) at different concentrations. The presence of new crystalline phases in the composites was investigated using the X-ray analysis (Rietveld refinement method). Impedance spectroscopy (IS) was used to study the dielectric properties of the samples in the radiofrequency region (<300 MHz). Furthermore, the IS allowed the study of the nature of the impedances and determined the activation energy (Ea) which show that the additions of Bi2O3 contributed to the increase in the activation energy. The Nyquist diagram was used and, through an equivalent circuit formed by an association with two resistors, each in parallel with a constant phase element (CPE), it was possible to numerically determine the behaviors of the grain and contour grain effects of the ceramic samples. In addition to dielectric analysis, impedance spectroscopy measurements were carried out to study the nature of impedance, and the measured data was also fitted to the famous Cole–Cole spectrum. The contribution of the grain and grain boundary to the resistance and capacitance for Bi2O3 replacement was calculated from the theoretical fitted data. The capacitance coeficient of temperature (TCC) was obtained and its values demonstrate that the Bi2O3 additions caused an increase in the thermal stability of the composites in relation to the pure matrix.