Influence of Nb5+ ions on the dielectric properties of CaCu3Ti4O12 ceramics

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

Materials Research Bulletin Pub Date : 2025-02-26 DOI:10.1016/j.materresbull.2025.113405

M. Ehthishamul Haque , S. Divya , S. Cathrin Lims , R. Robert , C. Justin Raj , M. Jose

引用次数: 0

Abstract

In this work, Nb⁵⁺ doped CCTO ceramic with high dielectric constant (ɛ_r) and a very low dielectric loss (tanδ) is reported. Powder XRD analysis confirmed the cubic perovskite structure and the Rietveld profile shows the goodness of fit below 2. The XPS analysis confirmed the presence of Ca 2p, La 3d, Cu 2p, Ti 2p, O 1 s, and C 1 s, all of which exhibited their expected oxidation states. The SEM micrographs revealed a grain size of 1.01 ± 0.07 μm for pure and 1.77 ± 0.13 μm for Nb⁵⁺doped CCTO. The Nb⁵⁺doped CCTO exhibited high ɛ_r ≈ 1.26 × 10⁵ at 50 Hz with low tanδ ≈ 0.85 at 1 kHz for 673 K in comparison with pure CCTO. The Nyquist plots established a deviation from Debye type relaxation with a negative temperature coefficient of resistance (NTCR) type behaviour.

Abstract Image

查看原文本刊更多论文

Nb5+离子对cuu3ti4o12陶瓷介电性能的影响

本文报道了具有高介电常数(r)和极低介电损耗（tanδ）的Nb5+掺杂CCTO陶瓷。粉末XRD分析证实其为立方钙钛矿结构，Rietveld曲线在2以下表现出良好的拟合度。XPS分析证实了Ca 2p、La 3d、Cu 2p、Ti 2p、o1s和c1s的存在，均表现出预期的氧化态。SEM显微图显示，纯CCTO晶粒尺寸为1.01±0.07 μm， Nb5+掺杂CCTO晶粒尺寸为1.77±0.13 μm。与纯CCTO相比，掺Nb5+的CCTO在50hz时表现出高的r≈1.26 × 105，在673 K时表现出低的tanδ≈0.85。Nyquist图建立了一个偏离Debye型弛豫的负温度阻力系数（NTCR）型行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.