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<p>This work presents the study of the electrical properties of Ba<sub>2</sub>TiSi<sub>2</sub>O<sub>8</sub> (BTS) ceramic with additions of 1% up to 9% in bulk of CaTiO<sub>3</sub> (CTO) in the radio frequency region. The structural analysis was performed by X-ray diffraction, and the refinement confirmed the structures of BTS and CTO with no evidence of spurious phases. The electrical properties were analyzed by Impedance Spectroscopy, whereas it was observed that the dielectric permittivity (<i>ε</i><sup>′</sup><sub><i>r</i></sub>) of the composites was lower than that of the pure BTS sample. The conductivity of the samples followed the universal power law, and the charge carriers demonstrated sudden translational jumps (0 &lt; <i>n</i> &lt; 1). The imaginary part of the impedance (<i>Z</i><sup>′′</sup>) showed peaks that shifted to the high-frequency region with increasing temperature. The Cole–Cole diagram was used to analyze the behavior of grains and grain boundaries; the samples presented non-Debye relaxation processes. Finally, the temperature capacitance coefficient was calculated, and the values indicate that the additions of CTO promoted an improvement in thermal stability compared to the BTS matrix.</p>

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Impedance spectroscopy and thermal stability study of the Ba2TiSi2O8–CaTiO3 composites for radio frequency applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月31日

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  • R. F. Abreu,
  • D. da M. Colares,
  • P. M. O. Silva,
  • F. A. C. Nobrega,
  • D. B. de Freitas,
  • J. P. C. do Nascimento,
  • F. F. do Carmo,
  • J. C. Sales,
  • T. O. Abreu,
  • M. A. S. Silva,
  • R. S. Silva,
  • C. Singh,
  • R. de Lacerda,
  • A. S. B. Sombra

摘要

This work presents the study of the electrical properties of Ba2TiSi2O8 (BTS) ceramic with additions of 1% up to 9% in bulk of CaTiO3 (CTO) in the radio frequency region. The structural analysis was performed by X-ray diffraction, and the refinement confirmed the structures of BTS and CTO with no evidence of spurious phases. The electrical properties were analyzed by Impedance Spectroscopy, whereas it was observed that the dielectric permittivity (ε′r) of the composites was lower than that of the pure BTS sample. The conductivity of the samples followed the universal power law, and the charge carriers demonstrated sudden translational jumps (0 < n < 1). The imaginary part of the impedance (Z′′) showed peaks that shifted to the high-frequency region with increasing temperature. The Cole–Cole diagram was used to analyze the behavior of grains and grain boundaries; the samples presented non-Debye relaxation processes. Finally, the temperature capacitance coefficient was calculated, and the values indicate that the additions of CTO promoted an improvement in thermal stability compared to the BTS matrix.