ENERGY & FUELS
·
2020
·
IF 3.421
Shiwei Ma,Shiyi Chen,Huijun Ge,Tao Song,Ping Lu,Wenguo Xiang
CeO2 is a typical fluorite oxide with desirable lattice oxygen conductivity and can be applied as an active support for the Fe-based oxygen carrier in chemical looping hydrogen generation (CLHG). However, Fe2O3/CeO2 always suffers from low thermal stability and sintering. Doping foreign cations could be a proper way to improve its reactivity and cyclic stability. In this work, Zr4+ and Sm3+, with a smaller ionic radius and lower valence than Ce4+, respectively, were doped into Fe2O3/CeO2 using the co-precipitation method, and the doping effects on the reactivity and redox stability of Fe2O3/CeO2 in CLHG were investigated. Fe2O3/Ce0.6Sm0.15Zr0.25O1.925 provided the best redox reactivity, and the purity of generated hydrogen for all oxygen carriers reached nearly 100% (the detection limit of CO/CO2 was 0.01% in volume). The reactivity followed the sequence Fe2O3/Ce0.6Sm0.15Zr0.25O1.925 > Fe2O3/Ce0.8Sm0.2O1.9 > Fe2O3/Ce0.75Zr0.25O2 > Fe2O3/CeO2. However, the concentration of oxygen vacancy was ranked as Fe2O3/Ce0.8Sm0.2O1.9 > Fe2O3/Ce0.6Sm0.15Zr0.25O1.925 > Fe2O3/Ce0.75Zr0.25O2 > Fe2O3/CeO2. The Zr doping boosted the reactivity of Fe2O3/CeO2 mainly by enhancing its sintering resistance, whereas the Sm doping achieved it mainly by promoting the oxygen conductivity, whose ability to improve the thermal stability of Fe2O3/CeO2 was rather limited. Both Zr and Sm doping could suppress the outward migration of Fe cations in the particles, resulting in higher sintering resistance. Furthermore, Zr and Sm could dissolve into CeO2 for prepared Fe2O3/Ce0.6Sm0.15Zr0.25O1.925; however, the bleeding out of both dopants was observed with Sm0.5Zr0.5O1.75 formation, which could be detrimental to the redox stability of the oxygen carrier.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yanhong Gu,Jianguo Zhao,Weiying Zhang,Haiwu Zheng,Laimei Liu,Wanping Chen
Sm and Ti co-doped BiFeO 3 (BFO) ceramics with Fe vacancies—Bi 0.86 Sm 0.14 FeO 3 , Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 , and Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 —were prepared by a solid-state method using a rapid liquid process. X-ray diffraction indicated that all samples exhibited a rhombohedral structure with a minor secondary phase. The structural transformation from a rhombohedral (space group: R 3 c ) to orthorhombic structure (space group: Pnma ) was observed in the sample of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , which was also confirmed by Raman scattering spectra. Microstructural investigations with scanning electron microscopy showed a reduction in grain size with doping of BFO. The dielectric loss of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 reaches 0.05 (at 100 Hz) owing to the introduction of Ti and Fe vacancies. Ferroelectromagnetic measurements revealed the existence of ferroelectricity with a remanent polarization of 0.24 µC/cm 2 in Bi 0.86 Sm 0.14 FeO 3 , paraelectricity in Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , and weak ferromagnetism with a remanent magnetization of 0.2 emu/g in Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 . The two composition-driven phases exist simultaneously and the different coercive field might be related to the jumps in the ferromagnetic hysteresis loops. Both the ferroelectric and magnetic properties were shown to correlate with the composition-driven structural evolution.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Yuanlang Wan,Xuefang Xie,Shuang Zhou,Weihang Li,Jingkang Ma,Yaqin Zhou,Yijian Song,Ji Zhou,Anqiang Pan
Li3VO4 (LVO) presents significant advantages in cost and capacity, making it a promising candidate for next-generation lithium-ion battery (LIB) anodes. However, its low electronic conductivity hampers practical applications. Herein, we report a Sm-modified Li3VO4/C composite (LSVO/C) designed for high-performance LIBs. Sm doping introduces additional defects and optimizes the electronic structure of Li3VO4, resulting in a significantly enhanced electronic conductivity (2.94 × 10–3 S cm–1) of the composites. Furthermore, the carbon-fiber-based framework effectively maintains structural stability during cycling, facilitating superior ion transport kinetics. Benefiting from these enhancements, the LSVO/C composite achieves remarkable discharge capacities of 379.5 mAh g–1 at 0.25 C and 260.1 mAh g–1 at 12.5 C. Additionally, an LSVO/C||NCM111 full cell, using LiNi1/3Co1/3Mn1/3O2 (NCM111) as the cathode, retains a discharge capacity of 50.5 mAh g–1 after 1000 cycles at 3.0 C, highlighting the potential of LSVO/C for practical applications. This unique method in preparing anode material will open new gates for highly efficient LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jian Wu,Ying Zhang,Min Luo,Bing Lu,Yan Yang,Kai Sun,Daming Chen,Yingli Liu,Jie Li
Co 2 Z ferrite with superior performance is a beneficial material for high filter devices and antenna substrates. In this work, Ba 3 Co 2 Fe 24-x Sm x O 41 ( x = 0.00–0.50 with a step of 0.10) materials were prepared using low temperature-fired process with 2.5 wt% of Bi 2 O 3 . The phase formation, microstructure, magnetic property , complex permittivity, and complex permeability were studied using X-ray diffraction, scanning electron microscopy, vibrating sample magnetometer , and vector network analyzer. The materials remained in a single hexagonal phase, and the grain size increased with increase of Sm-doped content. Saturation magnetization of samples increased at first and then decreased. When x = 0.20 and 0.30, the value of 4π M S was 2910.4 G and 2861.7 G, respectively. The variation of saturation magnetization is mainly due to the occupancy of Sm 3+ ions. When Sm 3+ ion doped Fe 3+ ion of Co 2 Z ferrite, Sm 3+ ion first preferred to occupy 4e IV site due to its low electronegativity, and then occupied 12k and 4f sites at high doped content, affecting magnetic moment and magneto-crystalline anisotropy. Furthermore, low-temperature sintering improves magnetic-dielectric properties of Sm-doped materials in high-frequency range. The real part of magnetic permeability (μ′) reached a maximum value of 8.4 when x = 0.20 and the real part of dielectric permittivity (ε′) reached a maximum value of 14.1 when x = 0.30. The magnetic loss and dielectric loss remained low (tanδ μ = 0.05–0.08 and tanδ ε = 0.005–0.04) and the off-cut frequency was nearly 1 GHz. The results indicated that these magnetic-dielectric materials have great potential for high-frequency antenna 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
JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 119
·期 6
·
IF 2.101
Shi Xin Xin,Liu Xiao Qiang,Chen Xiang Ming
The evolution of structure, ferroelectric, and piezoelectric properties in Bi 1−x Sm x Fe 0.99 Ti 0.01 O 3 ceramics was extensively investigated within the entire morphotropic phase boundary region with 0 ≤ x ≤ 0.20. A sequential phase transition of R3c-Pna2 1 -Pbnm with increasing Sm content was revealed by Rietveld refinement of the X-ray diffraction data together with the macroscopic ferroelectric measurements. Both ferroelectric and piezoelectric properties showed a great enhancement in the vicinity of the R3c/Pna2 1 (polar-to-polar) phase boundary, which should be caused by the field-induced phase transition between these two phases. Such field-induced phase transition might be essentially accompanied by a change of magnetic state, which indicated a way of controlling magnetism by means of electric field.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongrui Jia,Jiahao Mi,Zhen Li,Linghang Wang
Sm-doped Pb(Mg 1/3 Nb 2/3 )-PbTiO 3 (PMN-PT) binary ferroelectric ceramics has received extensive attention due to the excellent dielectric and piezoelectric properties . However, its Curie temperature ( T c ) is greatly reduced by Sm doping and T c is only 89 °C at the optimum piezoelectric coefficient. In this work, Sm-doped Pb(Mg 1/3 Nb 2/3 )O 3 –Pb(Zn 1/3 Nb 2/3 )-PbTiO 3 (Sm: PMN-PZN-PT) ternary ferroelectric ceramics near MPB were successfully manufactured and the crystal structure, microstructure and electric properties were investigated with respect to Sm doping content. A high piezoelectric coefficient of 870 pC/N and a high T c of 146 °C were achieved simultaneously in PMN-PZN-PT ternary ceramics with 1% Sm doping content. In addition, the room temperature dielectric constant was greatly improved by Sm doping and the P r , P s and E c values gradually decrease with the increase of Sm content. These results indicate that Sm-doped PMN-PZN-PT ceramics may be an attractive material for high performance piezoelectric device applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 3
·512
·
IF 3.2
Zechi Ma,Zixuan Yuan,Zhonghua Yao,Jiangxue Chen,Hua Hao,Minghe Cao,Hanxing Liu
Piezoelectric materials (PZTs) enjoy extensive applications in the field of electromechanical sensors due to their sensitive response to external electric fields. The limited piezoelectric response for single-layer piezoceramic pellets drives the use of multilayered technology to increase the electric displacement of a single piezo device. As is well known, Ag is commonly used as a metal for electrodes in devices based on traditional PZTs, which always densify at a high temperature above 1100 °C, resulting in Ag migration. Here, a high-performance samarium-ion-doped Sm0.01Pb0.99(Zr0.54Ti0.46)O3ceramic was selected as parent materials to develop a new Ag-cofired ceramic matrix with a sintering temperature of 920 °C by glass flux. The ceramic composition with 2.0 wt% glass addition exhibits the excellent performance of piezoelectricd33~492 pC/N, planar electromechanical coupling coefficientkp~50.1%, mechanical quality factorQm~68.71, and Curie temperatureTc~356 °C, respectively. The cyclic stability ofd33was measured below 6.6% at 30 kV/cm, which indicates that the piezoceramic has good temperature stability and fatigue resistance. Therefore, this study provides a novel high-performance piezoelectric system to meet the cofired requirement for multilayered piezoelectric devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Lei Yu,Kuibao Zhang,Weiwei Li,Baozhu Luo
In this study, Sm-doped Gd 2 Zr 2 O 7 transparent ceramics were successfully prepared by high temperature vacuum sintering using combustion synthesized nanopowders . X-ray diffraction, solid ultraviolet absorption spectrophotometer and fluorescence spectrometer were employed to investigate the structural evolution and photoluminescence properties of as-prepared samples. The Sm-doped Gd 2 Zr 2 O 7 nanopowders are in defective fluorite structure, which transforms into pyrochlore structure after high temperature sintering . The 3% Sm-doped sample exhibits high in-line transmittance of 74.7% at the wavelength of 1000 nm. The fluorescence lifetimes of all samples excited at 404 nm and detected at 615 nm are in millisecond scale, and the concentration quenching occurs when the Sm doping concentration reaches to 10%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2015
·Vol. 38
·期 5
·1149-1154
·
IF 1.017
DENG TIAN,ZHANG CHONGRONG,XIAO YUYUAN,XIE ANRAN,PANG YUE,YANG YANZHAO
The samarium-doped ceria (SDC) nanospheres were prepared by the one-step hydrothermal method and characterized by transmission electron microscope, scanning electron microscope, powder X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive spectrometer and Raman spectra. According to the results, samarium was doped into the lattice successfully. The as-prepared samples were dispersed well and the average diameter was 60 nm. It showed better catalytic performance than pure ceria and the most appropriate concentration of doping was found.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 2
·686-696
·
IF 2.787
Qingqing Yang,Bin Meng,Zuoliang Lin,Xinkun Zhu,Feng Yang,Shan Wu
To further enhance the electrical conductivity of doped ceria, the samarium-doped ceria (SDC)/Al 2 O 3 nanocomposites were prepared through sintering the coprecipitated powders in 1100°C-1300°C. The grain sizes of all composites are less than 100 nm and decrease with alumina addition. Besides the main phases of SDC and Al 2 O 3 , the SmAlO 3 can precipitate in the composites if sintered at higher temperatures or for longer dwell time. The deviations of SDC diffraction peak positions demonstrate the solid solution of alumina into SDC lattice. The total electrical conductivities of the composites increase with alumina content until 30% alumina is added. The SDC/30%Al 2 O 3 presents the higher total conductivity than the pure SDC by about five times. Specifically, the grain interior conductivity generally decreases with the alumina addition while the grain-boundary conductivity increases with that. The introduction of the conductive SDC/Al 2 O 3 interface can contribute to the rise of total conductivity, yet the excessive alumina addition also blocks the oxygen ion conduction. The SmAlO 3 precipitation is detrimental to the ion conduction for it consumes part of alumina and leads to the decrement in Sm concentration of SDC grain. Appropriate alumina addition not only enhances the conductivity of SDC but also lowers the material cost.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haochen Sun,Yingzhi Meng,Feifei Han,Silin Tang,Xiuyun Lei,Qingqing Ke,Dingyuan Wang,Yisong Bai,Biaolin Peng,Xue Chen,Xiang Niu,Shengguo Lu,Laijun Liu
Electrocaloric refrigeration technology has garnered significant attention due to its potential for next-generation solid-state cooling, which is miniaturized and efficient. However, achieving a substantial electrocaloric effect (ECE) and a wide working temperature range at low electric fields remains a challenge. In this study, a synergistic approach combining domain and defect engineering was used in transparent 0.88 Pb(Mg 1/3 Nb 2/3 )O 3 -0.12PbTiO 3 - x Sm(0.88PMN-0.12 PT- x Sm) ceramics to improve ECE and temperature stability. Finally, a notable adiabatic temperature change ( ΔT ) of 2.07 K in the x = 0.01 ceramic, with ΔT exceeding 1.0 K across a broad temperature range from 30 to 180 °C was achieved. Piezoresponse force microscopy (PFM) and X-ray photoelectron spectroscopy revealed the presence of small domains and appropriate oxygen vacancies as contributors to the enhanced ECE and broad operation temperature range. This work introduces a promising candidate material for electrocaloric refrigeration.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 28
·11713-11719
·
IF 3.5
Haoran Yu,Jian Guo,Jiajia Wang,Ji Zhang,Shan-Tao Zhang
As the two typical basic binary solid solutions of the relaxor-PbTiO3 family, Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) has been widely investigated, whereas Pb(Ni1/3Nb2/3)O3-PbTiO3 (PNN-PT) has not. Here, 1.5 mol% Sm-doped (1 − x)Pb(Ni1/3Nb2/3)O3–xPbTiO3, (1 − x)PNN–xPT:0.015Sm with x = 0.33–0.39, ceramics have been prepared and the chemical composition-induced evolution of crystal structure, domain, and electrical properties investigated systematically. With increasing PT content, evolution of the rhombohedral–tetragonal structure was observed. A rhombohedral–tetragonal morphotropic phase boundary occurred around x = 0.36–0.37, which showed a peak piezoelectric property with piezoelectric constant d33 = 531 pC N−1 and planar electromechanical coupling factor kp = 0.37 at room temperature. At the same time, the x = 0.36 composition showed improved ferroelectric behavior with remanent polarization Pr = 13.4 μC cm−2 and coercive field Ec = 3.2 kV cm−1. Interestingly, different from its PMN-PT counterpart, there is no temperature-driven phase transition between room temperature and the Curie temperature for (1 − x)PNN–xPT:0.015Sm. These parameters indicated that the PNN-PT system is worthy of more attention and is a promising platform for further development of high-performance piezo/ferroelectric materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）