MATERIALS CHEMISTRY AND PHYSICS
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2019
·
IF 2.781
Hong Lei,Tingting Liu,Lei Xu
SiO 2 abrasive is one of the most effective abrasives used in chemical mechanical polishing (CMP) due to its uniform size, good dispersibility and good chemical reactivity. In this paper, a series of novel Sm-doped colloidal SiO 2 composite abrasives were synthesized by seed-induced growth method. The composite abrasives were characterized by using scanning electron microscopy, time-of-flight secondary ion mass spectrometry analysis (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS). The structure of the composite abrasive is core-shell type with silica as a core and a coated growth layer (including SiO 2 , Sm 2 Si 2 O 7 and Sm(OH) 3 as shell via chemical bonds and hydrogen bonds . The CMP properties of the composite abrasives on sapphire substrates were further studied and the results show that the Sm-doped colloidal SiO 2 composite abrasives give lower polished surface roughness (Ra) and higher MRR than that of the pure colloidal SiO 2 abrasive under the same polishing conditions. By TOF-SIMS and XPS analyses on the polished slurries, the acting mechanisms of Sm-doped colloidal SiO 2 composite abrasives on sapphire were explored also.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 16
·26354-26368
·
IF 4.3
Shengwen Shu,Ruojun Yu,Han Qiu,Longlong Shu,Yongling Lu,Zhen Wang
To realize passive vibration monitoring of power transformers, this study proposes a self-powered method for transformer vibration monitoring sensors based on the Sm-doped-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) piezoelectric bimorph array. This study conducts the theoretical analysis and field measurement of the transformer vibration signals. In addition, the preparation method of a high-performance Sm-doped-PMN-PT piezoelectric bimorph is investigated. The properties of the xSm-PMN-yPT ceramics are also analyzed. Further, the output voltage and power characteristics of the piezoelectric bimorph arrays with different combinations are compared. Finally, the validation and application of the prototype are presented. The experimental results show that the 2.5%Sm-PMN-32PT has a high piezoelectric coefficient (d33) of 1710 pC/N. The results also indicate that the piezoelectric self-powered device with a parallel structure consisting of nine piezoelectric bimorphs has a maximum power generation of 2.341 mW under the measured transformer vibration excitation. Moreover, it is shown that it takes 75 min to complete the charging of the 7.5 V-1-F faradic capacitor from 4.4 to 5 V to satisfy the condition for the required energy of 2.82 J for the vibration signal acquisition, processing, and transmission, realizing the intermittent passive vibration monitoring of the transformer for 16 times per day. Therefore, the proposed method has a promising engineering application prospect.
研究领域:
电气工程
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Zuying Feng,Liang Liu,Lingyao Li,Jiahe Chen,Yuhong Liu,Yan Li,Liang Hao,Yan Wu
Three dimensional (3D) printing has attracted much more interest from the research community due to its ability to make complex structures with high resolution and simplified fabrication process. Here we constructed composited electrolyte with certain thickness for the application of low temperature of solid oxide fuel cells. The fabrication of a thin and dense Sm-doped ceria composite electrolyte layers with the thickness about 1200 μm utilizing paraffin-based slurry were investigated. To optimize the assembled cells, 1.7 wt. % glassfiber was introduced and an amazing electrochemical performance was observed. The maximum power density can reach 448 mW/cm 2 , 20% higher than the one without glassfiber and the open-circuit voltage is approximately 1.0 V at 550 °C. It is of great potential for 3D printing technology to develop low temperature solid fuel cells with designed mini-structures.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xi Ouyang,Manwen Yao,Xi Yao,Tongqing Yang
The piezoelectric properties of lead-based ceramics can be enhanced by A -site doping with rare earth elements and texture engineering. However, the effects of defect engineering and the mechanism of enhancing the unipolar electrostrain need to be further explored. This study aims to investigate the microscopic properties and changes in defect dipoles in lead piezoceramics with Sm-doping and texture engineering. Specifically, temperature-dependent XRD and Raman tests showed that texture engineering exhibited remarkable structural stability, and a systematic test was conducted on the temperature stability of the piezoelectric constant d 33 , which fully confirmed a significant positive correlation between the temperature stability and the structural stability of the piezoceramics. Additionally, the epitaxial process induced a high density of interfacial defects due to lattice mismatch, which was analyzed by EPR testing. We observed a 41 % increase in the concentration of oxygen vacancies with texture engineering, but this was reduced by 19 % with 1 % Sm-doping. Furthermore, the buffer layer formed by Sm-doping helps to mitigate the rotation of the BO 6 octahedron during the epitaxy process, resulting in a 29 % reduction in Raman peak broadening. The changes in the defect dipole displacement polarizabilities after Sm-doping were also calculated through defect engineering. The mechanism of high unipolar electrostrain was explored by examining the variations between oxygen vacancy concentration, defect dipole displacement polarizabilities, internal bias field, asymmetry, and leakage current. These results demonstrate the feasibility of texture engineering for high electrostrain through defect engineering and have significant implications for optimizing the reliability of piezoelectric devices in high-temperature environments.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 19
·28700-28709
·
IF 5.6
Zhengxiu Ma,Wenwu Cao
Obtaining a large piezoelectric coefficient and high temperature stability simultaneously in piezoelectric ceramics is a formidable challenge. By strategically designing a morphotropic phase boundary (MPB) composition with localized structural heterogeneity, 0.1 Pb(Yb 1/2 Nb 1/2 )O 3 -0.435PbZrO 3 -0.465PbTiO 3 -1mol% Sm ceramic demonstrates outstanding electromechanical performance with d 33 = 585 pC/N, k p = 0.66, T C = 365 °C, and outstanding temperature stability, the piezoelectric coefficient d 33 varies less than 10 % in the temperature range of 25–260 °C, making it a promising candidate for applications in high-temperature transducers and sensors. Our investigations revealed that the enhanced piezoelectricity originates from Sm 3+ induced intensification of relaxor behavior and structural refinement of hierarchical nanodomains, while the high temperature stability is attributed to the larger volume fraction of ferroelectric domains of the T-phase, which provide “pinning” of the nanodomains through the hierarchical domain structure.
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DOI
高影响因子
JOM
·
2025
·
IF 2.3
Huang Yongtao,Zheng Jie,Li Ying,Wang Zezhong
To address the low conductivity of yttrium-doped BaZrO 3 (BZY) proton-conducting electrolytes, this study synthesized Sm-doped BaZr 0.8 Y 0.2− x Sm x O 3−δ ( x = 0–0.15) via sol–gel, systematically investigating the effects of Sm doping on the structural, morphological, and electrochemical properties. Key findings reveal that optimal Sm doping ( x = 0.05) produces homogeneous grains (relative density: 97.39%), reduces lattice parameters (4.208 Å), and enhances conductivity to 12.4 × 1 0 −3 S cm −1 at 650°C, which is 63% higher than that of undoped BZY (7.6 × 10 −3 S cm −1 ). The anode-supported SOEC based on BaZr 0.8 Y 0.2− x Sm x O 3−δ ( x = 0.05) prepared by the co-pressing method shows good performance at low temperatures: the electrolytic current reaches up to 0.31 A cm −2 at 650°C and a voltage of 1.5 V (34.8% higher than undoped cells), and a hydrogen production rate of 129.58 mL cm −2 h −1 . This work demonstrates that controlled Sm doping in BZY significantly boosts ionic transport and SOEC efficiency at 650°C, providing a viable strategy for next-generation proton-conducting electrochemical devices.
研究领域:
能源材料
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电化学
·
陶瓷材料
·
氢能制备技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haolin Xie,Yongxiang Wang,Haitao Liu,Hengyu Wang,Yinghan Li,Xiaopeng Qi,Tongxiang Liang,Jinming Zeng
Electrochromic materials (ECMs) have received attention owing to its huge potential applications, such as smart dimming windows, static displays, and electrochromic capacitors. High optical contrast and long cyclic life of ECMs are extremely critical for practical applications. In this work, the WO 3 and rare earth Sm-doped WO 3 (WSm x , x = 2.0, 3.0, 4.0, 5.0) films were constructed by hydrothermal system, and then their morphology and electrochromic performance were explored. The morphology of the WO 3 film was transformed from an urchin-like to a nest-like porous structure by adding 4.0%Sm into the hydrothermal system. In comparison with the WO 3 film, the WSm4.0 film displayed higher optical contrast and cyclic life, which was resulting from its crystalline and amorphous mix phases, and nest-like porous structure with high Li + diffusion coefficient and strong structure stability. The optical contrasts of the WO 3 and WSm4.0 films were 57.9% and 61.4% at 633 nm wavelength, respectively. Furthermore, WSm4.0 film exhibited optical contrast of around 70% range from 700 to 1100 nm wavelength. Remarkably, WSm4.0 film still retained 91.7% and 73.6% of primitive optical contrast after 6000 and 10000 cycles, respectively. The nest-like porous WSm4.0 film are promising for assembling electrochromic smart windows with long cyclic life and high optical contrast.
研究领域:
材料科学
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电化学
·
纳米技术
·
光电子学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Liu,Jianjun Chen,Ya Wang,Shangchao Xiong,Ziang Su,Yun Wang,Wenhao Yang,Xuefeng Chu,Weinan Yang,Yue Peng,Wenzhe Si,Junhua Li
A series of Sm-doped Co 3 O 4 catalysts for the N 2 O direct catalytic decomposition were synthesized by the sol–gel method using citric acid as a chelating agent and urea as a combustion agent. The doping of Sm significantly altered the activity of N 2 O decomposition on the Co 3 O 4 catalyst. Sm was incorporated into the Co 3 O 4 matrix, leading to the distortion of Co 3 O 4 lattice with the spinel configuration maintained. Sm-doping can effectively promote the oxygen vacancy generation, and the electron interaction between Co and Sm species occurred as the Co 3+ + Sm 2+ ↔ Co 2+ + Sm 3+ redox cycle. Combined with in situ Raman and in situ NAP-XPS results proposed that this redox cycle is the main reason that the Sm-doping accelerates the high-efficiency N 2 O decomposition.
研究领域:
催化
·
材料科学
·
环境化学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Pengyang Jiang,Baoxin Ge,Jiaqing Liu,Caijin Huang,Xue Feng Lu
Urea oxidation reaction (UOR) kinetics is severely limited by suboptimal intermediate adsorption, which can be significantly improved by modulating catalyst spin configurations. Herein, we report an effective strategy for reforming the Ru spin configuration in pyrochlore oxide Y 2 Ru 2 O 7 (YRO) to enhance UOR performance through gradient orbital coupling. By partially substituting Y with Sm, we precisely regulate the electronic structure of candidate Y 1.9 Sm 0.1 Ru 2 O 7 (YRO-Sm), transforming Ru spin configuration from the low spin to the high spin (HS) configuration. The HS configuration endows YRO-Sm with excellent UOR activity (1.43 V at j = 100 mA cm −2 ) and robust stability. Theoretical analysis reveals that Sm substitution leads to a significant Sm(4 f)–O(2p)–Ru(4d) orbital electron coupling effect. The highly degenerate 4 f orbitals of Sm enhance Ru–O covalency and Ru electron localization in YRO-Sm, facilitating *COO intermediate dissociation and thereby lowering the energy barrier for UOR. The practical potential of YRO-Sm was further demonstrated through its successful integration into both a hybrid water electrolyzer for energy-saving hydrogen production and a urea-assisted zinc–air battery. This work demonstrates a promising pathway for developing high-performance pyrochlore catalysts via spin state engineering for sustainable energy conversion applications.
研究领域:
催化
·
材料科学
·
电化学
·
能量转换
·
无机化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13405-13414
·
IF 7.059
Zhi-Gang Liu,Zhen-Hua Tang,Song-Cheng Hu,Di-Jie Yao,Fei Sun,De-Yang Chen,Xiao-Bin Guo,Qiu-Xiang Liu,Yan-Ping Jiang,Xin-Gui Tang
Progress in energy storage ceramics for applications has been of interest owing to their clean green nature and excellent ferroelectric/dielectric performances. In this study, lead-free Sm-doped 0.95BaTiO3–0.05Bi(Mg0.5Ti0.5)O3 (BT–BMT–xSm) relaxor ferroelectric ceramics were synthesized and confirmed to be an appropriate material for storage devices. After the introduction of Sm2O3 into BT–BMT ceramics, their hysteresis loops gradually shrank and became slender, which is beneficial to achieving high efficiency energy storage in ceramic capacitors. The maximum recoverable energy density for the BT–BMT–xSm (x = 0.03) sample reached 3.86 J cm−3 at normal temperature, and its corresponding energy efficiency reached 81.6%. Moreover, it was found from impedance spectroscopy that the breakdown field strength is related to the oxygen defect content in the samples. Ceramic samples with fewer defects have better insulation performance, which means that a high breakdown field strength will be obtained. With proper doping, enhanced relaxor behaviour and breakdown field strength were obtained to achieve excellent energy storage properties.
研究领域:
材料科学
·
能量存储
·
陶瓷
·
铁电材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）