JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 19
·1-8
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IF 2.8
Yan Shuai,Hu Wencai,Wang Sen,Liu Gaobin
In this paper, Sr-doped BaTiO 3 nanoparticles were synthesized via electrochemical method, leading to the successful preparation of Ba 0.67 Sr 0.33 TiO 3 (BST) powders. The phase composition and microstructure of the powders were characterized using X-ray diffraction small angle X-ray scattering, scanning electron microscopy (SEM), and transmission electron microscopy. The results show that the average grain size of the nanoparticles is in the range of 10–20 nm, and the particles with good crystallinity are obtained under the environment of 3 mol.L −1 NaOH concentration. Sintering at 1250 ℃ for 3 h yields nanoscale BST ceramics with a dense structure and an average grain size of about 300 nm. These fine-grained ceramic samples exhibit superior temperature stability compared to relatively coarser BST ceramics. Furthermore, due to their nanoscale grain size, extensive phase transitions result in a low dielectric constant as observed from the dielectric property data. This work presents a novel approach for preparing nanoscale powders and homogeneous ceramics applicable in various electronic applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
SCRIPTA MATERIALIA
·
2019
·
IF 4.539
Baisheng Ma,Yan Zhu,Kewei Wang,Zhenzhong Sun,Dianguang Liu,Gang Shao,Jinling Liu,Yiguang Wang
Flash sintering method was adopted to sinter SiO 2 -coated BaTiO 3 ceramics to lower sintering temperature and shorten sintering time. The microstructure and dielectric property of BaTiO 3 with different amount of SiO 2 coating were studied. Samples can be flash sintered at furnace temperatures lower than conventional sintering temperature. Though the onset flash sintering temperature increased obviously with increasing SiO 2 content, the estimated sample temperatures were found close to each other. Samples with improved density was achieved with higher SiO 2 content, but their dielectric constant decreased. Flash sintered samples with 1.5 wt% SiO 2 addition possess a fair dielectric constant with improved density.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2014
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IF 3.94
D. Xu,W.L. Li,L.D. Wang,W. Wang,W.P. Cao,W.D. Fei
The high piezoelectric properties of piezoelectric ceramics are typically obtained by inducing a phase transition between two ferroelectric phases, using either the morphotropic phase boundary (MPB) or the polymorphic phase transition (PPT). Here we demonstrate that neither the MPB nor the PPT is necessary to achieve high piezoelectric properties. Our results show that the optimized distribution of Li + –Al 3+ pairs parallel to the [0 0 1] direction, as found in our x LiAlSiO 4 /BaTiO 3 ( x LAS/BT) lead-free piezoelectric ceramic system prepared from ordinary raw materials by conventional solid-state reaction sintering , can generate a large piezoelectric constant ( d 33 ) of 378 pC/N when x = 7.5 mol.%. The d 33 value of the 7.5 mol.% LAS/BT ceramic is more than three times that of the pure BT ceramic. The distortion connected to the proposed Li + –Al 3+ pairs locally creates unit cells of less than tetragonal symmetry, and these low-symmetry cells can be responsible for the high piezoelectric response. The high-temperature stability testing reveals that these doped ceramics are usable at temperatures as high as 120 °C. This piezoelectric mechanism coming from the doping ionic pairs provides a new method to achieve large piezoelectric properties in a wide range of ABO 3 -type perovskite systems.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Kuan Cai,Huancheng Huang,Yanhao Xu,Xin Wang,Pinle Zhang,Fanchao Yu,Junyu Chen,Yunxia Bai,Shuangxi Nie,Shuangfei Wang,Hainong Song,Xinliang Liu
Piezocatalysis has wide applications in the field of pollutant treatment. However, the catalytic activity of single piezocatalysts is limited. Constructing heterojunctions can effectively enhance its charge carrier transfer capability. In this work, Cu I /Cu II @BaTiO 3 composites with different Cu I /Cu II ratios were synthesized. A high reaction rate constant of 0.0886 min -1 in the Cu I /Cu II @BaTiO 3 (1:0.3) is obtained, which is 2.54 times than that of BaTiO 3 and superior to other lead-free perovskites-based composites. The multivalent heterogeneous interfaces form different potential gradient regions, which enhance the efficient generation of superoxide radicals (•O 2 - ), reaching approximately 2.01 times the yield of pure BaTiO 3 . In addition, the Cu I /Cu II structure serves as an active site for •O 2 - , facilitating the in-situ generation of hydrogen peroxide (H 2 O 2 ) and triggering a Fenton-like reaction to produce hydroxyl radicals (•OH). This study provides valuable insights for the design of multi-valent heterostructure piezocatalysts for wastewater treatment applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Nan Ma,Ya Yang
ABSTRCT Ferroelectric material BaTiO 3 (BTO) with intrinsic spontaneous polarization demonstrates excellent pyroelectric effect that output current/voltage signals can be observed even by slight temperature fluctuation. Here, we report a self-powered 365 nm UV light photodetector by using the light-induced pyroelectric effect in Ag/BTO/Ag device with the response time of about 0.5 s at the rising edge. Moreover, the heating-induced pyroelectric effect has been utilized to enhance the 365 nm light response, where both the corresponding photoconductive gain and responsivity can be dramatically enhanced by larger than 1200% under a temperature variation rate of 2.1 K/s as compared with that of UV light illumination. Our study proposes a feasible method to enhance the 365 nm light response by coupling light and heating-induced pyroelectric effect in BTO, which has potential applications in thermal energy scavenging and self-powered sensor systems .
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 1
·265-275
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IF 2.787
Longwen Wu,Xiaohui Wang,Zhengbo Shen,Longtu Li
The (1− x )BaTiO 3 – x Bi(Zn 2/3 Nb 1/3 )O 3 ( x = 0.01–0.30) ceramics were synthesized by solid-state reactions. The solubility limit was determined to be x = 0.20. A systematic structural transition from a tetragonal phase ( x ≤ 0.034), to a mixture of tetragonal and rhombohedral phases (0.038 ≤ x ≤ 0.20), and finally to a pseudocubic phase ( x ≥ 0.22) at room temperature was identified. Dielectric measurement revealed a ferroelectric ( x ≤ 0.04) to relaxor ( x ≥ 0.06) transition with permittivity peak broadening and flattening, which was further verified by Raman spectroscopy and differential scanning calorimetry (DSC). Activation energies obtained from the Vogel–Fulcher model displayed an increasing trend from ~0.03 eV for x ~ 0.05, to unusually high values (>0.20 eV) for the compositions with x ≥ 0.15. With the increase in Bi(Zn 2/3 Nb 1/3 )O 3 content, the polarization hysteresis demonstrated a tendency from high nonlinearity to sublinearity coupled with the reduction in remnant polarization and coervice field. The deconvolution of the irreversible/reversible polarization contribution was enabled by first-order reversal curve distributions, which indicates that the decreasing polarization nonlinearity with the increase in Bi(Zn 2/3 Nb 1/3 )O 3 concentration could be related with the change from the ferroelectric domain and domain wall contributions to the weakly coupled relaxor behaviors.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Chunli Diao,Hanxing Liu,Haiwu Zheng,Zhonghua Yao,Javed Iqbal,Minghe Cao,Hua Hao
Electrostatic dielectric energy storage capacitors have attracted much attention recently for their fast charging-discharging speed and high power density. Trilayered Ba 0.4 Sr 0.6 TiO 3 /BaTiO 3 /Ba 0.4 Sr 0.6 TiO 3 (BST/BT/BST) thin films were prepared by spin-coating technique. The sandwich-structured thin films showed high dielectric constant (ε r = 952) and low dielectric loss (tanδ = 0.034) at room temperature (10 kHz). Moreover, the dielectric constant of the thin films demonstrated good frequency stability within the measured frequency range and broad capacitance variation (20 °C–160 °C, ΔC/C 25°C <±10%). The electric-field dependence of dielectric response was investigated and the dielectric tunability was 13.3% at 100 kV/cm. Compared with pure BT thin films, the heterostructure exhibited enhanced electric breakdown strength and energy storage density. The recoverable energy storage density and efficiency of BST/BT/BST thin films were 14.69 J/cm 3 and 33.9% at 1.44 MV/cm, respectively. The results indicated that BST/BT/BST heterostructure films would be an alternative way to improve the energy storage density of dielectrics for applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 12
·965-970
·
IF 1.059
Lingfeng Ruan,Rongying Jiang,Jing Liu,Song Liu
BaTiO3/TiO2 and CaTiO3/TiO2 bilayer-type photocatalyst films have been prepared and characterised by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, UV-vis, and scanning electron microscopy techniques. The photodeposition of silver was done to confirm the reduction positions of the titanate/TiO2 films. Silver deposited preferentially on the side of TiO2 for BaTiO3/TiO2 whereas on the side of CaTiO3 for CaTiO3/TiO2. These results imply that the direction of photogenerated electron transfer is coincident with the semiconductor physical principles. Upon exposure to light, electron–hole pairs are generated and subsequently separated by an internal electrostatic field in the titanate–TiO2 heterojunction.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
Journal of Materiomics
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2024
·
IF 8.4
Yingzhi Meng,Silin Tang,Zhaojie Wang,Xiang Niu,Hongfang Zhang,Dingyuan Wang,Yisong Bai,Biaolin Peng,Sheng-Guo Lu,Qingqing Ke,Laijun Liu
The electrocaloric effect (ECE) offers a pathway to environmentally sustainable and easily miniaturized refrigeration technology, positioning it as a front-runner for the next generation of solid-state cooling solutions. This research unveils a remarkable ECE in a finely tuned (Ba 0.86 Ca 0.14 ) 0.98 La 0.02 Ti 0.92 Sn 0.08 O 3 ceramic, exhibiting a temperature shift (Δ T ) of 1.6 K across more than 85% of the maximum Δ T (Δ T max ) and spanning an exceptionally wide operational range of 92 K. Our investigation on dielectric responses and ferroelectric polarization-electric field ( P–E ) loops suggests that the broad operational scope results from the fragmentation of extended ferroelectric domains into smaller domains and polar nano-regions (PNRs) supported by PFM analysis. Furthermore, the introduction of La enhances spontaneous polarization by significantly extending the maximum electric field that can be applied, facilitating high-performance ECE at ambient temperature. This study positions BaTiO 3 -based lead-free ceramic as a sustainable alternative for addressing the cooling demands of modern electronic components, marking a significant stride toward next-generation solid-state refrigeration.
研究领域:
材料科学
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固态制冷技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Min Zhang,Chaoyong Deng
The evolution of the dynamic hysteresis with electrical field amplitude ( E ) and frequency ( f ) in the ferroelectric BaTiO 3 (BTO) single crystal films prepared by pulsed laser deposition (PLD) has been investigated systematically. A noticeable transition from the low-frequency behavior to the high-frequency one was confirmed by observing the obtained hysteresis loops and the change of the physical properties. In addition, the analysis of the theoretical model shows that the frequency dependence of domain motion is the cause of the dynamic hysteresis loop scaling behavior.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
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
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电子工程
✓ 已验证
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
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电子工程
✓ 已验证
DOI
高影响因子
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