Structural evolution, electrical properties, and non-ohmic behavior of barium-doped CaCu3Ti4O12 ceramics synthesized via solid-state method

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.244

El Houcine Lahrar , Abdechafik EL Harrak , El Hassan Yahakoub , Amine Bendahhou , Hafida Essaoudi , Abdessamad Faik

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引用次数: 0

Abstract

Barium-doped calcium copper titanate ceramics Ca_1-xBa_xCu₃Ti₄O₁₂ with x = 0, 0.05, 0.1 and 0.2 were synthesized by the conventional solid-state method. We studied the effects of substituting Ca for Ba in the perovskite compound CCTO on structural evolution and electrical responses by changing the value of x. Processing the results of X-ray diffraction analysis using the Rietveld refinement method revealed that all the powders of the compounds studied in this work present a single perovskite phase with cubic symmetry of the Im

\overline{3}

space group. SEM analysis revealed that Ba doping promotes a reduction in grain size and a more uniform grain distribution. Complex impedance analysis highlighted a marked reduction in grain boundary resistance and an increase in relaxation time with Ba substitution. Dielectric measurements shows that all the doped ceramics have a lower dielectric permittivity value (ε_r) than CCTO, due to the low grain boundary resistivity of the barium-doped compounds. AC conductivity showed frequency-dependent behavior consistent with hopping conduction mechanism, while barium doping reduced conductivity, due probably to lower carrier mobility and finer grain size. The breakdown field (E_b) and the non-linear coefficient (α) were significantly improved with Ba doping, reaching maximum values of 5.01 kV/cm and 7.45, respectively.

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固态法合成掺钡ccu3ti4o12陶瓷的结构演化、电学性能和非欧姆行为

采用常规固相法合成了x = 0、0.05、0.1、0.2的掺钡钛酸钙铜陶瓷Ca1-xBaxCu3Ti4O12。我们通过改变x的值研究了钙钛矿化合物CCTO中Ca取代Ba对结构演化和电响应的影响。使用Rietveld细化方法处理x射线衍射分析结果表明，本工作中研究的化合物的所有粉末都呈现出具有Im 3空间群立方对称的单一钙钛矿相。SEM分析表明，Ba的掺入使晶粒尺寸减小，晶粒分布更加均匀。复阻抗分析表明，Ba取代显著降低了晶界电阻，增加了弛豫时间。电介质测量结果表明，由于掺钡化合物的晶界电阻率较低，所有掺钡陶瓷的介电常数值（εr）均低于CCTO。交流电导率表现出频率依赖行为，与跳跃传导机制一致，而钡掺杂降低了电导率，可能是由于载流子迁移率降低和晶粒尺寸更细。Ba的掺入显著提高了材料的击穿场（Eb）和非线性系数（α），分别达到最大值5.01 kV/cm和7.45 kV/cm。

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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.