Investigating the NTC characteristics of (1 − x)BFN − xBCW ceramics via impedance spectroscopy

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-06-01 DOI:10.1016/j.ceramint.2025.02.205

Manel Amara , Anouar Jbeli , Nouf Ahmed Althumairi , J. Dhahri , E.K. Hlil

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引用次数: 0

Abstract

In this study, we synthesized perovskite-phase NTC thermistors, specifically the solid solutions 0.995BFN-0.005BCW (0.995 BaFe_0.5Nb_0.5O₃-0.005 BiCu_0.75W_0.25O₃) and 0.99BFN-0.01BCW (0.99 BaFe_0.5Nb_0.5O₃-0.01 BiCu_0.75W_0.25O₃), using a solid-state reaction method. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase cubic structure, indicating successful integration of BCW into the BFN lattice. The electrical characterization revealed significant negative temperature coefficient (NTC) behavior, with room temperature resistivities (ρ₂₅) ranging from 1.98 × 10⁴ to 9.44 × 10⁴ Ω cm and thermal constants (B_25/75) spanning from 2257 to 2956 K, directly correlated with the BCW doping levels. Impedance spectroscopy highlighted the samples' electrical inhomogeneity, revealing that grain boundary resistance exceeded grain resistance, suggesting a complex conduction mechanism driven by space charge dynamics and oxygen vacancy interactions. This research highlights the potential of customized perovskite NTC thermistors for advanced temperature sensing applications in automotive and aerospace sectors, emphasizing the importance of microstructural optimization in enhancing their performance.

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阻抗谱法研究（1−x）BFN−xBCW陶瓷的NTC特性

本研究采用固相反应法合成钙钛矿相NTC热敏电阻，具体为固溶体0.9995 bfn -0.005 bcw （0.995 BaFe0.5Nb0.5O3-0.005 BiCu0.75W0.25O3）和0.99 bfn -0.01 bcw （0.99 BaFe0.5Nb0.5O3-0.01 BiCu0.75W0.25O3）。x射线衍射（XRD）分析证实形成了单相立方结构，表明BCW成功集成到BFN晶格中。电学表征显示出显著的负温度系数（NTC）行为，室温电阻率（ρ25）在1.98 × 104 ~ 9.44 × 104 Ω cm之间，热常数（B25/75）在2257 ~ 2956 K之间，与BCW掺杂水平直接相关。阻抗谱显示样品的电性不均匀性，晶界电阻超过晶界电阻，提示空间电荷动力学和氧空位相互作用驱动的复杂传导机制。这项研究强调了定制钙钛矿NTC热敏电阻在汽车和航空航天领域先进温度传感应用中的潜力，强调了微结构优化对提高其性能的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.