Tuning dielectric and nonohmic properties of CaCu3Ti4O12 ceramics with W doping

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-04-14 DOI:10.1016/j.materresbull.2025.113493

H. Moreno , V.C. Teixeira , M.A. Ponce , C.E. Macchi , C.M. Aldao , V.D.N. Bezzon , A.Z. Simões , M.A. Ramirez

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引用次数: 0

Abstract

This study investigates the dielectric and nonohmic properties of the CaCu₃Ti₄O₁₂: x % W (x = 0.00, 0.02, 0.010, 2.50, 5.00) denoted as CCTO, W002, W010, W250, and W500, respectively. X-ray diffraction analysis confirmed a pseudo-cubic perovskite phase (Im-3 space group) for samples, and a CaCu₃Ti₄O₁₂/CaWO₄/TiO₂ composite system for high W content (W250, W500), supported by energy dispersive spectroscopy (EDS) and X-ray fluorescence (XRF) measurements. Positron annihilation lifetime spectroscopy identified

V_{C u}^{″} / V_{C a}^{″}

vacancies as the main defects induced by W incorporation, influencing charge carrier mobility at grain boundaries, thus affecting sintering, grain size, and morphology. Lower W content (W002) resulted in a high dielectric response (ε∼1.2 × 10⁴) with improved tanδ (0.02). Conversely, W250 exhibited higher nonlinear coefficient (α∼38), with low leakage current (I_L∼14.6 μA/cm²) and breakdown voltage (Eb∼198 V. cm⁻¹). This solid-state synthesis method provides a way to customize TiO₂/CaWO₄-doped CCTO matrices, showcasing promising varistor characteristics that are well-suited for hybrid capacitor-varistor devices and related applications.

Abstract Image

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掺杂W调整cuu3ti4o12陶瓷的介电和非欧姆性能

本研究考察了CaCu3Ti4O12: x % W （x = 0.00, 0.02, 0.010, 2.50, 5.00）分别为CCTO， W002, W010， W250和W500的介电和非阻抗特性。x射线衍射分析证实了样品的准立方钙钛矿相（Im-3空间群），以及高W含量（W250, W500）的CaCu3Ti4O12/CaWO4/TiO2复合体系，并得到了能量色散光谱（EDS）和x射线荧光（XRF）的支持。正电子湮没寿命谱鉴定出VCu″/VCa″空位是W掺入引起的主要缺陷，影响晶界载流子迁移率，从而影响烧结、晶粒尺寸和形貌。较低的W含量（W002）导致高介电响应（ε ~ 1.2 × 104）和改善的tanδ(0.02)。相反，W250具有较高的非线性系数（α ~ 38），低泄漏电流（IL ~ 14.6 μA/cm2）和击穿电压（Eb ~ 198 V. cm−1）。这种固态合成方法提供了一种定制TiO2/ cawo4掺杂CCTO矩阵的方法，展示了非常适合混合电容器-压敏电阻器件和相关应用的有前途的压敏电阻特性。

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

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.