JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 25
·1-13
·
IF 2.8
Lu Jiajun,Kong Wenwen,Xie Juntao,Zhao Yan,Zhao Qing,Chang Aimin
High-temperature thermistors face significant challenges in maintaining stability under extreme temperature conditions, meaning that stringent requirements for material selection and structural design are needed. To address this issue, negative temperature coefficient (NTC) thermistor ceramics of Ba 2 ReNbO 6 (Re = La, Nd, and Sm) were successfully prepared using the solid-state reaction method. X-ray diffraction (XRD) analysis revealed that Ba 2 ReNbO 6 (Re = La, Nd, and Sm) had an ordered double perovskite structure. Scanning electron microscopy (SEM) revealed that as the difference in cationic radii between B′/B″ decreased, the porosity of the materials gradually increased. After Ba 2 ReNbO 6 (Re = La, Nd, and Sm) underwent aging tests at 1173 K for 720 h, the resistance drift rates were 1.33, 3.80, and 5.88%, respectively, and the aging mechanism was explained using cation diffusion theory. These ceramics exhibited typical NTC characteristics over a wide temperature range from 773 to 1473 K, with the degree of linearity exceeding 0.999 for all the samples.
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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
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PubMed
高影响因子
ACS Applied Optical Materials
·
2026
·
IF 3.4
Chaofan Wang,Gen Li,Ziran Li,Dixi Ke,Haocheng Li,Junwen Huang,Ziang Wan,Mengyao Zhu,Han Zhang,Jiejun Ren,Min Zeng,Yuebin Li
Phosphor-converted light-emitting diodes (pc-LEDs) represent a key technology in solid-state lighting. However, their performance and reliability are often limited by the thermal instability of conventional phosphors under high-power operation. To address this challenge, this study reports two thermally stable red-emitting phosphors, NaYMgWO6:Sm3+ and NaYMgWO6:Eu3+, synthesized via a high-temperature solid-state reaction method. A remarkable abnormal thermal quenching behavior is observed in NaY0.97MgWO6:0.03Sm3+, whose luminescence intensity at 348 K exceeds the room-temperature value. Meanwhile, NaY0.7MgWO6:0.3Eu3+ exhibits outstanding thermal stability, retaining 80.82% of its room-temperature emission intensity at 423 K. Under near-UV and blue excitation, NaYMgWO6:Sm3+ and NaYMgWO6:Eu3+ emit intense orange-red (645 nm) and red (615 nm) light with high color purity values of 85.81% and 96.58%, respectively, and show negligible chromaticity drift up to 448 K. Notably, the internal quantum efficiency reaches 27.59% for the Sm3+-doped phosphor and 88.86% for the Eu3+-doped counterpart. Practical application is demonstrated through fabricated pc-LED prototypes, which produce bright orange-red and red emissions. Furthermore, when incorporated into white LED devices along with a commercial yellow phosphor and a blue chip, the developed red phosphors effectively compensate for the spectral deficiency in the red region, significantly improving the color rendering performance and yielding warm white light with a high color quality. These results highlight the promising potential of the developed NaYMgWO6:Sm3+/Eu3+ phosphors for high-stability solid-state lighting applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Minkang Li,Xin Liu,Zhuohan Zhang,Yuan Li,Zhaoyang Liu,Lu Zhang,Lixiang Ma,Shumin Han
Mg 2 Ni alloys face sluggish kinetics and high operating temperatures for hydrogen storage. This study employs a synergistic strategy of porosity engineering and Sm doping. Porous Mg 2 Ni and Sm x Mg 2- x Ni alloys are synthesized using NH 4 HCO 3 as a pore-forming agent. The optimized porous Mg 2 Ni achieves rapid absorption (3.1 wt% within 100 s at 200 °C) and lowers the initial desorption temperature to 223 °C without ball milling. Sm doping forms catalytic Sm 3 H 7 , enhancing hydrogen transport and reducing the dehydrogenation barrier. The best composition, Sm 0.05 Mg 1.95 Ni, exhibits initial and peak desorption temperatures of 220 °C and 306 °C, an activation energy of 51.24 kJ mol −1 , and >95% capacity retention after 10 cycles. This work demonstrates that combining porous structure with Sm doping catalysis is an effective strategy to enhance Mg 2 Ni-based hydrogen storage materials.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Haodong Tang,Yao Wang,Wujian Zhang,Zongjian Liu,Lichun Li,Wenfeng Han,Ying Li
SmCeO x composite oxide with Sm 3+ occupying Ce 4+ site in CeO 2 crystal lattice , prepared via citric acid complexation method, was loaded with 2 w% Ru by impregnation method and the as-prepared catalyst was then evaluated for ammonia decomposition. The results show that the partial substitution of Ce 4+ by Sm 3+ produces a positive effect on the catalyst performance and SmCeO x supported Ru exhibits a much higher low-temperature catalytic activity for ammonia decomposition compared with other supports such as Sm 2 O 3 , CeO 2 , and a physical mixture of Sm 2 O 3 and CeO 2 . For example, the ammonia conversion is increased from 54.6% to 74.9% at a temperature of 400 °C and a space velocity of 3900 ml/g cat ·h when CeO 2 is replaced by Sm 0.4 Ce 0.6 O 1.8 . TEM and CO chemisorption investigations reveal that the excellent performance of Ru/SmCeO x catalyst is related to its high Ru dispersion. The results of BET, EPR and H 2 -TPR suggest that the partial substitution of Ce 4+ with Sm 3+ may induce the formation of oxygen vacancies and the high Ru dispersion can be attributed to the presence of large amount of single-electron trapped oxygen vacancies on the surface of SmCeO x , which have a strong interaction with Ru and thus Ru preferentially occupies the oxygen vacancies. This experimental observation is also supported by the DFT calculation result that Ru species adsorbed on the oxygen vacancy has a low adsorption energy .
研究领域:
催化
·
化学工程
·
材料科学
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高影响因子
CHEMICAL PAPERS
·
2020
·Vol. 74
·期 11
·3987-3993
·
IF 1.68
Pan Binfeng,Zhang Zhimin,Lu Xuchen
Abstract The reaction between rare earth oxychloride (REOCl) and water was investigated. X-ray diffractometer, volumetric titrations, FTIR spectrograph and scanning electron microscope were used to determine the reaction process and the reaction products. It was found that the reaction could be concluded as follows: 5REOCl(s) + 5H 2 O(l) = 2RE 2 (OH) 5 Cl(s) + RE 3+ (aq) + 3Cl − (aq). Based on this reaction, a new method for determining the purity of anhydrous rare earth chloride was proposed. Compared with the conventional method, the maximum absolute error decreased from 22 to < 1% and the maximum relative error decreased from 111 to < 4% under the experimental conditions. Graphic abstract
研究领域:
化学
·
材料科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xiaoyu Song,Xianxian Wang,Xuewen Xu,Xin Liu,Xiaoli Ge,Fanbin Meng
The Sr 2 CaWO 6 : RE 3+ (RE = Dy, Sm and Eu) phosphors with the unusual emissions corresponding to the magnetic-dipole (MD) transition were synthesized via a sol-gel process. The crystal structure, electronic properties, photoluminescence excitation and emission spectra, and fluorescence lifetimes of the as-prepared samples were investigated. X-ray diffraction analysis confirmed that Sr 2 CaWO 6 crystallized in the monoclinic structure with the centrosymmetric monoclinic space group (P2 1 /n). The indirect band gap for Sr 2 CaWO 6 was 4.24 eV, which was calculated within the framework of density functional theory (DFT). The phosphors could be excited by the ultra-violet (UV) light at 280 nm, and exhibited characteristic emissions corresponding to the MD transitions for different RE 3+ ions. The WO 6 groups in the host lattice can absorb UV light efficiently, and then transferred the energy to activator ions. The results indicated that the doped rare earth ions occupied the centrosymmetric site in Sr 2 CaWO 6 lattice. With increasing the concentration of the dopants , the local symmetry of the activator ions can be effectively changed, which resulted in the enhancement of the characteristic emissions dominated by the electric-dipole (ED) transitions of the doped RE 3+ . The Sr 2 CaWO 6 : Sm 3+ phosphor exhibited near white emission under radiation of 280 nm.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Journal of Advanced Dielectrics
·
2023
·
IF 3.1
Chaofeng Wu,Wen Gong,Jinfeng Geng,Jianye Cui,Lipeng Mi,Jingkai Nie,Qiang He,Jiajiu Li,Fang-Zhou Yao
Mn O 2 -modified Pb 0 . 9 6 2 5 Sm 0 . 0 2 5 ( Mg 1 / 3 Nb 2 / 3 ) 0 . 7 1 Ti 0 . 2 9 O 3 ceramics were prepared via a solid-state reaction approach. Results of detailed characterizations revealed that the addition of Mn O 2 has influence on the grain size, and all samples exhibit a pure perovskite structure. As the content of manganese increases, the volume of tetragonal phase increases. The ceramics with 1.5 mol.% Mn O 2 show a high electro-strain of 0.151% at 2 kV/mm. Therefore, this study provides a new insight into the role of Mn O 2 addition in tailoring the electrical properties of the Sm-PMN-PT ceramics by acceptor doping.
研究领域:
材料科学
·
电子工程
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高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Yu Deng,Yi Zhang,Yigang Ding
Recovery and separation of rare earth elements was highly crucial but difficult. In this study, a well-designed new ionic liquid named as benzyltributylammonium decanedioate ([N 444Bn ] 2 [SA]) was developed to extract rare earths and separate Sm(III) from the spent SmCo magnets in acetate medium for the first time. To exhibit the superiority of acetate medium, the extraction of Nd(III) and La(III) in three different media were comparatively investigated under different conditions, including equilibrium time, initial pH of aqueous solution, rare earth concentration, extractant concentration, salting-out agent concentration and extraction temperature. The results revealed that the better extractabilities of La(III) were observed in acetate medium rather than those in chloride medium (i.e., 97.6% versus 78.6%), which may be attributed to the low-hydrated nature of acetate ions. Importantly, the back-extraction experiments indicated that 91.4% Nd(III) can be stripped from [N 444Bn ] 2 [SA] by using 1.5 mol/L HOAc, revealing the outstanding reusability of ionic liquid in the industrial separation-stripping cycles. Furthermore, the ion association mechanism was proposed to describe the extraction behavior and confirmed by the slope analysis and FT-IR characterizations in three media. In terms of the SmCoCu mixture separation, the maximal separation factor of Sm(III)/Co(II) was calculated as 3078 in simulated solution. Impressively, the recovery of Sm(III) from the actual SmCo magnets by our dicarboxylate-type ionic liquid was also successfully achieved with a recycling rate of 96.8% and a Sm(III)/Co(II) selectivity of 148, which exhibited the potential application in the separation of Sm(III) from the spent SmCo magnets.
研究领域:
化学工程
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材料科学
·
环境科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·3274-3280
·
IF 2.22
Du Kang,Zou Zheng-Yu,Song Xiao-Qiang,Fan Jun,Lu Wen-Zhong,Lei Wen
Novel Ca RE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) microwave dielectric ceramics were prepared using solid-state reaction sintered at 1350–1400 °C for 5 h. CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) possessed an apatite structure with the P 6 3 /m space group. The lattice parameters a , b and c ; theoretical density and unit cell volumes of CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) gradually decreased when RE changed from La to Er, and a pure phase was formed at all compositions. The ε r , Q × f , and τ f values of the CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) ceramics were related to the total ionic polarizability, packing fraction, and polyhedral distortion of RE/Ca(2)O 7 , respectively. The optimal microwave dielectric properties of the CaRE 4 Si 3 O 13 ceramics ( ε r = 13.37, Q × f = 18,600 GHz, and τ f = − 17.8 ppm/°C) were obtained at RE = Er.
研究领域:
材料科学
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物理学
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高影响因子
JOURNAL OF STRUCTURAL CHEMISTRY
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2022
·Vol. 63
·期 6
·845-853
·
IF 1.004
Chen X.,Gao R. -L.,Li B.,Wang H. -M.
Abstract Reaction of SmCl 3 ·6H 2 O with 3 equiv. of dihydroxodiphenylarsonium chloride [Ph 2 As(OH) 2 ]Cl resulted in the first structurally characterized lanthanide complex of organoarsinate [Sm(μ-O 2 AsPh 2 ) 3 ]. Single crystal X-ray diffraction reveals that this complex belongs to the trigonal system, \(R\bar{3}\) space group, with a = 24.077(3) Å, b = 24.077(3) Å, c = 10.708(1) Å, β = 120°, V = 5375.8(1) Å 3 and Z = 6. This homoleptic compound features a 1D polymer arrangement in which two Sm atoms are bridged by three diphenylarsinate [Ph 2 AsO 2 ] – ligands under syn,syn μ 2 –η 1 :η 1 bridging mode. The coordination number of Sm center is 6, giving an almost perfect octahedron geometry. The antibacterial activity of [Sm(μ-O 2 AsPh 2 ) 3 ] is much weaker than the free ligand [Ph 2 As(OH) 2 ]Cl.
研究领域:
无机化学
·
生物化学
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Wenxuan Wang,Shan Hu,Zihan Liu,Zelang Jian,Wen Chen
The NASICON-type (Na 1+x Zr 2 Si x P 3-x O 12 , 0≤x ≤ 3) sodium-ion solid state electrolyte (SSE) has emerged as an alternative for liquid electrolyte due to its good chemical/electrochemical stability, high thermal stability and high safety. However, the insufficient ionic conductivity and poor understanding of Na + transport mechanism hinder the further development of sodium-ion SSE. Herein, we report Sm modified Na 3+x Zr 2-x Sm x Si 2 PO 12 (0≤x ≤ 0.4) electrolytes with a highest ionic conductivity of 2.25 × 10 −3 S cm −1 at 25 °C when x = 0.2. The introduction of Sm element adjusts the Si/P ratio in NASICON phase and densifies the electrolyte pellets by formation of Na 3 Sm(PO 4 ) 2 . To get a deep insight into the enhanced mechanism of Na + transport in grains, low-temperature electrochemical impedance spectra (LT-EIS) and Jonscher's power law relationship are employed to analyze the electrical behavior of grains. The results demonstrate that the regulation of Si/P ratio can evoke lower migration energy, more charge carrier concentration and higher hopping frequency , which synergistically improve the ionic conductivity in grains.
研究领域:
材料科学
·
电化学
·
储能
·
固体离子学
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高影响因子
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