JOURNAL OF ELECTROCERAMICS
·
2023
·Vol. 50
·期 4
·97-111
·
IF 1.7
Luan Saiwei,Wang Pengfei,Zhang Lei,He Yanmei,Huang Xiong,Jian Gang,Liu Cuicui,Yu Shuhui,Sun Rong,Cao Xiuhua,Fu Zhenxiao
Ultrafine ceramic powders with high tetragonality are the fundamental for the multi-layer ceramic capacitors (MLCCs). In this study, an efficient method of atmospherically hydrothermal assisted solid-state synthesis for ultrafine BaTiO 3 particles is presented. The BaTiO 3 nanopowders with homogeneous distribution, a mean particle size ~ 260 nm and high tetragonality of 1.0095 were obtained by at the optimal parameters of hydrothermal time of 6 h, Ba(OH) 2 ·8H 2 O/BaCO 3 = 0.25/0.75 and calcination temperature of 1000 o C. XRD and HRTEM analyses revealed a “core-shell” structure of TiO 2 @BaTiO 3 formed in the first-step hydrothermal process, which reduces the diffusion distance between BaCO 3 and TiO 2 , resulting in a lower calcination temperature at the second-step solid-state reaction. Compared with pure hydrothermal and solid-state reaction processes, the atmospherically hydrothermal assisted solid-state synthesis in this study shows larger ability for improving the particle size distribution and the tetragonality, reducing defects of BaTiO 3 particles. In particular, the grain size, sintering density, and dielectric constant at the Curie temperature of BaTiO 3 ceramics are 1.93 μm, 98%, and 7066, respectively. In the solid-state reaction stage, the lattice diffusion distance from BaO to TiO 2 tends to decrease due to the formation of BaTiO 3 shells, thus, high tetragonal and relatively small particle size of BaTiO 3 powder was synthesized. This work presents a method for preparing ultrafine BaTiO 3 powders with large tetragonality for MLCCs.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Junlei Qi,Minhao Zhang,Yiying Chen,Zixi Luo,Peiyao Zhao,Hang Su,Jian Wang,Hongye Wang,Letao Yang,Hao Pan,Shun Lan,Zhong-Hui Shen,Di Yi,Yuan-Hua Lin
The market-dominating material BaTiO 3 is highly crucial in advanced electronics and electric power systems owing to its fast charging/discharging speed and superior cycle life. However, the low energy storage efficiency and breakdown strength hinder further device miniaturization for energy storage applications. Herein, we design a high configurational entropy (HCE) material BaTiO 3 -BiFeO 3 -CaTiO 3 with rational microstructural engineering that demonstrates an ultrahigh energy density of 7.2 J cm −3 . The HCE design leads to the increased solubility of CaTiO 3 in the matrix, which enhances the resistivity and polarization. Simultaneously, the nano-segregations around the grains can enhance the breakdown strength obviously due to strongly scattering of electron carriers and impeding of electrical breakdown pathways. Furthermore, the multilayer ceramic capacitors (MLCCs) using such dielectrics were constructed with energy density of 16.6 J cm −3 and efficiency of 83%. This work offers a route to explore new dielectric materials that are expected to benefit dielectric devices' compactness and high performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiuyun Zhang,Mingnan Shangguan,Laijun Liu,Shenfeng Long,Tingting Wei,Guisheng Zhu,Yunyun Zhao,Huarui Xu
According to the literature reports, synthesis of Ba 1- x Ca x TiO 3 (BCT) ceramics with good microstructure and satisfactory dielectric property is still a challenge. So, a facile tartaric coprecipitation method in the study is proposed to prepare BCT fine powders with homogeneous morphology, high crystallinity and tetragonality. The effect of Ca 2+ doped concentration on microstructure and dielectric property was studied. Results showed that, the characteristics of the raw BCT powders greatly affected the microstructure and site occupancy of Ca 2+ in BT ceramics, which subsequently played a crucial rule on the dielectric performance. Owing to the good properties of the raw BCT powders, the as-obtained ceramics demonstrated good microstructure with uniform grain size of ∼1 μm, defined grain boundaries and densely packed without any cracks or pores. In addition, they also demonstrated much improved dielectric properties with good ε r , low tan δ , definite increase of Tc , suggesting they are compatible in application of MLCC with high performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 5
·4204-4210
·
IF 1.798
Huang Xuechen,Zhang Wenqin,Xie Juan,Xu Qi,Zhang Lin,Hao Hua,Liu Hanxing,Cao Minghe
Nb 2 O 5 doped 0.8BaTiO 3 –0.2(Na 1/4 Bi 3/4 )(Mg 1/4 Ti 3/4 )O 3 (0.8BT–0.2NBMT) polycrystalline ceramics were prepared by solid state reaction method. 0.8BT–0.2NBMT samples were observed to possess two dielectric peaks, which were attributed to the formation of core–shell structure (Huang et al. in J Eur Ceram Soc 36:533–540, 2015 ). Longer sintering induced uniform distributions of the additives. The introduction of Nb 2 O 5 into 0.8BT–0.2NBMT could obviously bring about the improvement of the dielectric temperature stability, the degradation of the dielectric loss at room temperature and the decrease of the sintering temperature. The 0.8BT–0.2NBMT ceramics doped with 2.0 at% Nb 2 O 5 could satisfy the temperature range of the X9R (−55 to 200 °C, △C/C 25°C = ±15% or less) characteristics, with a moderate dielectric constant of 1130, low dielectric loss of 0.7%, low sintering temperature of 1050 °C and insulation resistivity of 5 × 10 12 Ω cm at room temperature, which might be promising for practical use in multilayer ceramic capacitors. The inhomogeneous distribution and the existence of the secondary phases were responsible for this excellent dielectric temperature characteristic. The complex impedance analysis was introduced to elaborate the conduction mechanism.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 11
·4191
·
IF 3.4
Tingting Wang,Xiaoxiao Pang,Bin Liu,Jie Liu,Jing Shen,Cheng Zhong
The preparation of tetragonal barium titanate (BT) powders with uniform and suitable particle sizes is a significant prerequisite for ultra-thin and highly integrated multilayer ceramic capacitors (MLCCs). However, the balance of high tetragonality and controllable particle size remains a challenge, which limits the practical application of BT powders. Herein, the effects of different proportions of hydrothermal medium composition on the hydroxylation process are explored to obtain high tetragonality. The high tetragonality of BT powders under the optimal solvent condition of water:ethanol:ammonia solution of 2:2:1 is around 1.009 and increases with the particle size. Meanwhile, the good uniformity and dispersion of BT powders with particle sizes of 160, 190, 220, and 250 nm benefit from the inhibition of ethanol on the interfacial activity of BT particles (BTPs). The core–shell structure of BTPs is revealed by different lattice fringe spacings of the core and edge and the crystal structure by reconstructed atomic arrangement, which reasonably explains the trend between tetragonality and average particle size. These findings are instructive for the related research on the hydrothermal process of BT powders.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yang Gao,Hanxing Liu,Zhonghua Yao,Hua Hao,Zhiyong Yu,Minghe Cao
xBa 0.7 Sr 0.3 TiO 3 -SrTiO 3 (BST-ST) multilayer ceramics with different BST layers (x=1, 3, 5) were designed and fabricated by lamination of Ba 0.7 Sr 0.3 TiO 3 (BST) and SrTiO 3 (ST) tapes. Dielectric and energy storage properties of the multilayer ceramics were investigated. BST-ST multilayer ceramics exhibited enhanced temperature- and frequency-stability of dielectric properties , accompanying high permittivity (~2000) and low dielectric loss (<0.005) at room temperature. P-E loops revealed that BST-ST multilayer ceramics displayed low remnant polarization and favorable maximum polarization. The optimal energy storage performance was obtained in the composition of x=5 with dielectric breakdown strength of 220 kV/cm and energy storage density of 2.3 J/cm 3 . These results indicate that BST-ST multilayer ceramics can be a favorable candidate for dielectric capacitor applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiuyun Zhang,Jingsen Yue,Yunyun Zhao,Zeqiang Yan,Guisheng Zhu,Laijun Liu,Huarui Xu,Aibing Yu
A novel tartaric acid co-precipitation process was firstly reported to prepare tetragonal BaTiO 3 nano-powder with barium chloride, titanium tetrachloride as raw materials and tartaric acid as precipitant agent. The as-obtained BaTiO 3 powder exhibited a small average particle size about 140 nm, which still held a high tetragonality (c/a ratio) of 1.0092, suggesting its promising applications in multilayer ceramic capacitors (MLCC). In addition, this synthetic method will be of general interest to people who focuses on synthesis technology of Ti-based multicomponent oxides nano-materials owing to its outstanding advantages, including mild reaction condition, facile synthetic processes and especially stabilization of (TiO) 2+ even in a high pH about 8.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 5
·3329-3338
·
IF 3.5
Qinghu Guo,Pengbin Wang,Xiangyu Meng,Dongxu Li,Zhonghua Yao,Huajun Sun,Hua Hao,Hanxing Liu,Shujun Zhang
Multilayer ceramic actuators find extensive utility in applications requiring precise displacement control or force output, due to their advantages of high precision control, rapid response, low driving voltage, low power consumption, and so on. For practical applications, there is a need for high-performance multilayer ceramic actuators (MLAs) that combine cost-effectiveness, efficiency, and temperature stability. In this work, 1.5 mol%Sm-doped 0.25 Pb(Mg 1/3 Nb 2/3 )O 3 –0.36PbZrO 3 –0.39PbTiO 3 piezoelectric ceramics with PbO–CuO as sintering aid were fabricated. The addition of PbO–CuO significantly reduced the sintering temperature by 300°C, while having minimal impact on the piezoelectric properties. The optimized sintering condition, achieved at a low sintering temperature of 950°C with the introduction of a tiny 0.4 wt% sintering aid, yields impressive piezoelectric strain coefficient d 33 * = 690 pm/V. This substantiates the viability of employing low-cost Ag/Pd (90/10) as inner electrode, which can be co-fired with ceramic layer to fabricate MLA. This innovation enables a remarkable displacement of 1 µm at a low driving voltage of 200 V across a 9-layers piezoelectric actuator, accompanied by high-temperature stability, exhibiting <20% variation over the temperature range of 30–250°C. These results underscore a great potential for high-performance piezoelectric actuators over a broad temperature range.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 5
·3438-3446
·
IF 4.186
Shuting Pang,Yiping Wang,Ying Yang,Jiyang Zhang,Querui Hu,Jingjing Shi,XiongJie Li
Bi(Zn 1/2 Ti 1/2 )O 3 −BiScO 3 −PbTiO 3 (BZT−BS−PT) high Curie temperature piezoelectric ceramics were synthesized by the conventional solid-state reaction method. Systematical investigations on the sintering, piezoelectric, and dielectric properties of the piezoceramics have been conducted. It was found that the sintering temperature could be remarkably depressed by varying the compositions in BZT−BS−PT systems. For composition of 11BZT−34BS−55PT ceramic, the sintering temperature is even lowered down to 750°C without any extra additions of sintering aids. Meanwhile, the ceramic sintered at this ultralow temperature presents dense microstructure with relative density up to 97%, as well as optimal properties of piezoelectric coefficient d 33 of 336 pC/N and Curie temperature of 415°C. The mechanism of low sintering temperature may be ascribed to the low melting point bismuth-based components in BZT−BS−PT solid solutions. Furthermore, 11BZT−34BS−55PT multilayer ceramics have been co-fired at 750°C with Ag internal electrodes. The dense structures, low cost, and optimal comprehensive properties of the co-fired multilayers illustrate obvious advantages of the ultralow sintering temperature in LTCC devices, implying promising applications of this Bi(Zn 1/2 Ti 1/2 )O 3 −BiScO 3 −PbTiO 3 high Curie temperature ternary system.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 9
·1-12
·
IF 2.8
Luan Saiwei,Tang Miao,Mu Hanze,Yu Jie,Wang Pengfei,Zhang Lei
Highly tetragonal BaTiO 3 nanopowder serves as a pivotal raw material for manufacturing high-performance miniaturized multilayer ceramic capacitors (MLCCs). In this study, barium acetate and tetrabutyl titanate were used as reactants, isopropanol served as the titanium source stabilizer and dispersant, and oxalic acid was employed as the precipitant to investigate the preparation process of tetragonal-phase BaTiO 3 nanopowder. The optimal process parameters were identified, and the reaction mechanism for synthesizing BaTiO 3 via oxalate co-precipitation was explored. The experimental results indicate that, with a Ba/Ti stoichiometric ratio of 1.000 and a solution pH of 2.33, following the appropriate sequence of experimental reagent additions, the precursor underwent a precipitation reaction at 25 °C. After calcination at 950 °C, BaTiO 3 powder with an average particle size of 56 nm and a tetragonality of 1.0075 was successfully synthesized. The BaTiO 3 ceramic sintered at 1250 °C exhibits a density of 96.5% and an exceptional dielectric performance, with a dielectric constant of 9369 at the Curie temperature (125 °C). This study provides valuable insights for addressing the complex hydrolysis and residual chloride ion issues associated with the chloride method.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 18
·
IF 4
Kong Xi,Yang Letao,Luo Zixi,Liu Yiqian,Lan Shun,Yang Bingbing,Meng Fanqi,Ren Weibin,Zhang Xinyue,Cai Jinghan,Lin Yuan-Hua,Guo Jinming,Nan Ce-Wen
Dielectric ceramics with high polarization and low sintering temperature are important for high-performance and low-cost multilayer ceramic capacitors (MLCCs). Herein, BiFeO 3 was added to a lead-free composition 0.48BaTiO 3 -0.4Bi(Mg 0.5 Hf 0.5 )O 3 -0.12SrTiO 3 to lower the sintering temperature and increase the polarization simultaneously. As a result, a low sintering temperature of 950 °C and high comprehensive energy storage properties with a recoverable energy density W rec of 5.7 J/cm 3 and an energy efficiency η of 92% at 450 kV/cm were achieved. Together with the good temperature stability and cycling stability of W rec and η , the ceramics exhibit great potential in the energy storage MLCCs with low-cost Ag-Pd electrodes with a high Ag content.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Saiwei Luan,Huizhan He,Lei Zhang,Jie Yu,Xiuhua Cao,Jingxi Wang,Zhenxiao Fu,Rong Sun
The use of environmentally friendly aqueous tape casting has emerged as a promising route for fabricating high-quality BaTiO 3 -based films, particularly for ultra-thin multilayer ceramic capacitors (MLCCs). In this study, a high-solids-content BaTiO 3 slurry was formulated using APC (a polycarboxylate ammonium salt) as the dispersant, WB4101 as the acrylic binder, and PL002 as the plasticizer. The resulting 9.50 μm green tape exhibited a high density (3.65 g/cm 3 ), tensile strength (7.65 MPa), and fracture strain (11%), indicating good mechanical integrity. BaTiO 3 -based MLCC chips prepared from this tape showed a room-temperature capacitance of ∼28.0 nF and a dielectric loss of 0.02. Comprehensive evaluations of temperature coefficient of capacitance (TCC), ferroelectric hysteresis, DC-bias-dependent dielectric behavior, and resistivity degradation under accelerated DC stress were conducted. Notably, the TCC satisfied the X7R specification (−55 °C to 125 °C, ΔC/C 25 °C ≤ ±15%), confirming excellent dielectric temperature stability. Ferroelectric hysteresis characteristics, DC-bias-dependent dielectric stability, and resistance to degradation collectively demonstrate the excellent electrical reliability of the material. These results demonstrate that the proposed aqueous tape casting system is effective for producing reliable, high-performance BaTiO 3 -based MLCCs and provides a practical pathway for future development of lead-free, eco-friendly capacitor technologies.
研究领域:
材料科学
·
电气工程
·
陶瓷材料
·
环保技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）