钆改性对溶胶-凝胶制备（Ba0.85Ca0.15）（Zr0.2Ti0.8）O3薄膜漏导和储能性能的影响

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

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.360

Ke Zhang, Chen Zhang, Haoliang Li, Jingwang Lu, Zhipeng Ma, Xing Zhang

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引用次数: 0

摘要

采用溶胶-凝胶法在Pt/Ti/SiO2/Si衬底上制备了钆（Gd3+）修饰锆钛酸钡钙基薄膜[Ba(0.85-x)Ca0.15Gdx][Zr0.2Ti0.8]O(3+0.5x) （x = 0、0.005、0.0075和0.01）的微结构、漏导和储能性能。低Gd3+浓度（x≤0.0075）掺杂的BCGZT单相钙钛矿结构薄膜具有致密均匀的微观结构和细小的纳米晶粒。随着Gd3+含量的增加，由于Gd3+取代A位离子导致缺陷偶极子VCa″-VO••的存在，BCGZT薄膜的漏电流密度首先在x = 0.0075处降至最小，然后由于杂质相的出现，漏电流密度显著增加。随着电场的增大，BCGZT各膜的泄漏机制由欧姆导和/或SCL导转变为F-N隧穿。由于Gd3+改性BCZT钙钛矿的铁电性减弱，平均晶粒尺寸随着Gd3+含量的增加而减小，因此残余极化率不断降低。x = 0.0075的BCGZT薄膜在4300 kV/cm的超高击穿场下，储能密度达到55.1 J/cm3，储能效率达到67.1%，具有良好的电容器应用前景。

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Effects of gadolinium modification on leakage conduction and energy storage performance of sol-gel derived (Ba0.85Ca0.15)(Zr0.2Ti0.8)O3 thin films

The microstructures, leakage conduction and energy storage performances of Gadolinium (Gd³⁺) modified barium calcium zirconate titanate based thin films [Ba_(0.85-x)Ca_0.15Gd_x][Zr_0.2Ti_0.8]O_(3+0.5x) (x = 0, 0.005, 0.0075 and 0.01) prepared on the Pt/Ti/SiO₂/Si substrates using sol-gel method were characterized and analyzed. The dense and uniform microstructure with fine nanocrystalline grains is obtained in low Gd³⁺ concentration (x ≤ 0.0075) doped BCGZT thin films with single phase perovskite structure. With the increase of Gd³⁺ content, the leakage current density of BCGZT films initially decreases to the minimum at x = 0.0075 due to the existing of defect dipoles V_Ca″-V_O^•• caused by the Gd³⁺ substitution for A site ions and then increases significantly due to the appearance of impurity phases. With the increase of electric field, the leakage mechanism for each BCGZT film transforms from ohmic conduction and/or SCL conduction to F-N tunneling. The remanent polarization keeps decreasing because of the weakened ferroelectricity of Gd³⁺ modified BCZT perovskites and the decreasing average grain size as the Gd³⁺ content increases. The BCGZT thin film with x = 0.0075 possesses an enhanced energy storage density of 55.1 J/cm³ and an acceptable energy storage efficiency of 67.1 % at the ultra-high breakdown field of 4300 kV/cm, which is promising for capacitor applications.

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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.