mgo改性sr0.985 ho0.01 tio3基陶瓷高绝缘电容器的逐步优化

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

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2025.01.143

Yongqiang Yang , Yongping Pu , Lei Zhang , Bo Wang , Zhemin Chen , Min Chen , Xiang Lu , Chunhui Wu , Jinbo Zhang , Noureddine Blidi

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引用次数: 0

摘要

同时实现高绝缘电阻率和高介电常数的优异温度稳定性是电力电子领域的一个重大挑战。在Sr0.985Ho0.01TiO3-xwt%MgO (x = 0,0.05, 0.15, 0.25, 0.35, 0.45) （SHT-xM）陶瓷中，通过电荷补偿（平衡Ho和Mg离子）和晶界阻塞（MgO聚集）的协调，采用了逐步增强的方法。改性陶瓷具有高介电常数（1800），优异的温度稳定性(X8P， ΔC/C25°C≤10%,- 50-150°C；ΔC/C25°C≤0.6%,−40-70°C)和优异的绝缘电阻率（1012 Ω•cm），满足高绝缘X8P电容器的要求。此外，这些优异的性能可归因于[MgTi″−2HoSr•]和[MgTi″−VO••]形成过程中的电荷补偿，晶粒尺寸的减小以及基于缺陷和结构分析的MgO晶界钉住。我们的研究提出了一种新的和有效的策略，以克服同时实现优越的介电常数温度稳定性和高绝缘电阻率的挑战。

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Stepwise optimization in MgO-modified Sr0.985Ho0.01TiO3-based ceramics for high-insulation capacitors

Achieving high insulation resistivity and superior temperature stability of high permittivity simultaneously poses a significant challenge in the field of power electronics. This study employed a stepwise enhancement approach in Sr_0.985Ho_0.01TiO₃-xwt%MgO (x = 0, 0.05, 0.15, 0.25, 0.35, 0.45) (SHT-xM) ceramics via the coordination of charge compensation (balancing Ho and Mg ions) and grain-boundary obstruction (clustering of MgO). The modified ceramics demonstrated a high permittivity (1800), excellent temperature stability (X8P, ΔC/C₂₅ _°C ≤ 10 %, −50–150 °C; ΔC/C₂₅ _°C ≤ 0.6 %, −40–70 °C) and exceptional insulation resistivity (10¹² Ω • cm), meeting the demands of high insulation X8P capacitors. Furthermore, these outstanding properties can be attributed to charge compensation in the formation of [

{M g}_{T i}^{″} - {2 H o}_{S r}^{•}

] and

[{M g}_{T i}^{″} - V_{O}^{• •}]

, reduction of grain size and grain-boundary pinning of MgO based on defect and structural analysis. Our study presents a novel and efficient strategy to overcoming the challenge of achieving both superior temperature stability of permittivity and high insulation resistivity.

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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.