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<p>In this communication, synthesis (solid-state reaction) and characterization of a double perovskite, BiNaCoMoO<sub>6</sub>, are reported. The structural analysis suggests that the prepared sample adopts monoclinic crystal symmetry. The Williamson–Hall plot yields an average crystallite size of 38.1&#xa0;nm, a compressive lattice strain of 0.00133, and a dislocation density of 6.88&#xa0;x 10<sup>14</sup> m<sup>–2</sup>. The scanning electron microscope (SEM) micrograph study reveals the uniform distribution of the grains through well-defined grain boundaries. Purity and the presence of all constituent elements (Bi, Na, Co, Mo, and O) are confirmed from the analysis of the energy dispersive X-ray analysis&#xa0;(EDX) spectrum. Maxwell–Wagner’s polarization effect explains the dispersive nature of the dielectric plots. The analysis of the dielectric data suggests that the sample has a high dielectric constant and low loss. The study of frequency and temperature-dependent electrical impedance (resistive and capacitive), modulus, and conductivity exhibits a negative temperature coefficient (NTCR) behavior, non-Debye type relaxation, and thermally activated relaxation mechanism. The semiconducting character of the material is suggested by reducing the size of grain boundary resistance, which is reflected in the lowering intercepts of Nyquist and Cole–Cole plots with temperature. Analysis of resistance versus temperature confirms the NTC thermistor character and may be a suitable candidate for temperature sensor device applications.</p>

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A comprehensive study on the structure, microstructure, dielectric, electrical, and infrared properties of the BiNaCoMoO6 ceramic for NTC thermistor applications

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Mitrabhanu Padhi,
  • S. Mishra,
  • Adwit Prasad Sahu,
  • S. K. Parida

摘要

In this communication, synthesis (solid-state reaction) and characterization of a double perovskite, BiNaCoMoO6, are reported. The structural analysis suggests that the prepared sample adopts monoclinic crystal symmetry. The Williamson–Hall plot yields an average crystallite size of 38.1 nm, a compressive lattice strain of 0.00133, and a dislocation density of 6.88 x 1014 m–2. The scanning electron microscope (SEM) micrograph study reveals the uniform distribution of the grains through well-defined grain boundaries. Purity and the presence of all constituent elements (Bi, Na, Co, Mo, and O) are confirmed from the analysis of the energy dispersive X-ray analysis (EDX) spectrum. Maxwell–Wagner’s polarization effect explains the dispersive nature of the dielectric plots. The analysis of the dielectric data suggests that the sample has a high dielectric constant and low loss. The study of frequency and temperature-dependent electrical impedance (resistive and capacitive), modulus, and conductivity exhibits a negative temperature coefficient (NTCR) behavior, non-Debye type relaxation, and thermally activated relaxation mechanism. The semiconducting character of the material is suggested by reducing the size of grain boundary resistance, which is reflected in the lowering intercepts of Nyquist and Cole–Cole plots with temperature. Analysis of resistance versus temperature confirms the NTC thermistor character and may be a suitable candidate for temperature sensor device applications.