CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jinyang Li,Wenye Deng,Yan Xue,Ni Ai,Kai Ding,Xianghui Chen,Pengjun Zhao,Aimin Chang,Yongxin Xie
This study used the solid-phase method to prepare thermosensitive perovskite ceramics, La 0.9 B 0.1 AlO 3 (B = Pr, Nd, Sm). The XRD and EDS results indicated that all components presented a single phase and all elements were uniformly distributed, formed a good solid solution. The SEM results clearly illustrated that the doped elements had enhanced the surface morphology, resulting in more uniform grain formation. The TEM results showed that linear defects were present, which led to an uneven stress distribution; consequently, this enhanced the carrier transport. The alternating current (AC) impedance showed that the grain boundary resistance determined the overall complex impedance and exhibited a different conductive mechanism with increasing temperature, from polariton to ion conduction. With the introduction of Nd 3+ , the conductivity of La 0.9 Nd 0.1 AlO 3 increased and its temperature range increased from 600 – 1400 °C to 100–1500 °C. In La 0.9 Sm 0.1 AlO 3 , the presence of Sm 2+ enhances the aging stability by elevating the oxygen vacancy concentration and the aging drift rate (ΔR/R0) was found to be lower than 2 %. In addition, DFT-based calculations were performed to investigate the property changes in the crystal structure and energy band structure of pure and doped LaAlO 3 . This study demonstrated an effective way to improve the performance of high-temperature thermistor materials using different doping strategies.
研究领域:
材料科学
·
陶瓷
·
电子陶瓷
·
固体化学
·
计算材料科学
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产品关联
DOI
高影响因子
VACUUM
·
2025
·
IF 3.9
Shaojun Shi,Panye Jin,Zhixiong Huang,Jialei Kou,Hongmei Ji,Wenyu Yin,Xiaoyan Tang,Han Mao
With the development of sodium ion battery which is considered as the alternative of lithium ion battery, better performance is required. However, its poor structure stability and rate capability due to the Jahn–Teller distortion of Mn 3+ and poor charge transfer between transition metal and oxygen-ion limit its application. Here, Sm-doped P2-type layered oxide Na 0.67 Li 0.1 Mn 0.62 Fe 0.18 Cu 0.09 Sm 0.01 O 2 with spherical secondary hierarchy was obtained through microwave-assisted method. Pure P2-shaped layered oxide is obtained. And the tiny shift of the diffraction spectrum indicates the effect of doping. The electrochemical performance of the doped oxide improves obviously. Even at a high current density of 1.0A g −1 , the capacity is still as high as 60.3 mAh g −1 , much higher than that of undoped one. The cycle stability is also improved. Electrochemical impedance spectroscopy (EIS) and Distribution of relaxation times (DRT) are taken to further study the mechanism. It reveals that the doped samarium not only serves as the pillar to stable the structure of the layered oxide, but also makes faster charge transfer between transition metal ions and oxide ions due to the Multielectron structure of samarium. Thus, such Sm-doping strategy may offer a solution toward the application bottleneck of layered oxides for sodium-ion batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Jiatong Liu,Qingfeng Li,Yang Yang,Weishuang Fang,Huaicheng Xiang,Ning Zhang,Ning Guan,Jian Li,Ying Tang,Liang Fang
Two novel microwave dielectric ceramics, AgLnMo 2 O 8 (Ln = Sm, Yb), with low permittivity and sintering temperatures, were successfully obtained through the traditional solid-phase synthesis method. XRD analysis coupled with Rietveld refinement confirmed that the as-obtained sample possesses a single-phase tetragonal scheelite-type crystal structure with space group I 4 1 / a . The superior microwave dielectric responses were secured at 825 °C for AgSmMo 2 O 8 ( ε r = 11.74, Q × f = 89,000 GHz, τ f = −47.44 ppm/°C) and 800 °C for AgYbMo 2 O 8 ( ε r = 13.29, Q × f = 73,000 GHz, τ f = −36.54 ppm/°C). Bond valence and Raman analyses demonstrate that Ag + is locally compressed whereas Ln 3+ is underbonded (rattling) at shared dodecahedral sites. The compressed Ag + contributes to the negative τ f values, whereas the smaller Yb 3+ exhibits a more intense rattling effect than Sm 3+ , causing a higher permittivity, elevated loss, and a positive τ f shift. Both ceramics exhibited excellent chemical compatibility with silver-based electrodes, with no new phases observed during co-firing. A cylindrical dielectric resonator antenna was simulated with a resonance frequency of 4.067 GHz and a bandwidth of 289 MHz, using the AgSmMo 2 O 8 ceramic material. The outstanding performance suggests that AgLnMo 2 O 8 (Ln = Sm, Yb) ceramics may be promising candidates for LTCC technologies and C-band antennas.
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·
IF 6.3
Yao-Dong Liu,Kang Du,Xiao-Qiang Song,Chang-Zhi Yin,Jia-Qing Yang,Yi-Yang Cai,Ming-Fei Chen,Ya-Qing Hu,Zi-Hang Chen,Gui-Xin Zhang,Wen-Zhong Lu,Wen Lei
In this study, CaY 2- x M x Ge 3 O 10 ( M = Sm, Yb) ceramics with a P 2 1 /c space group were synthesised. Sm 3+ can fully substitute Y 3+ , whereas the solid solubility limit of Yb 3+ lies between 0.4 and 0.5. The corrected dielectric constant ( ε r-corr ) follows the trend of ε r-cal predicted based on the P-V-L theory, but is different with α D T / V m in CaY 2- x Sm x Ge 3 O 10 (1.2 ≤ x ≤ 2), where significant reductions in distortion of [YO 7 ] (Ave( δ Y − O )). The Q×f values, varying from 43,360±220 GHz to 113,620±680 GHz, are primarily governed by U t , P.F . , and E a . The τ f , varying from −9.6±0.1 ppm/°C to −217.6±2.0 ppm/°C, is influenced by both Ave( δ Y − O ) and fractional contribution of Ge−O bonds to overall susceptibility ( χ (Ge−O)/ χ ). Notably, CaY 1.6 Yb 0.4 Ge 3 O 10 ceramics exhibit a near-zero τ f (−9.6±0.1 ppm/°C) with ε r = 10.36±0.01 and Q×f = 92,540±560 GHz. CaY 1.7 Yb 0.3 Ge 3 O 10 achieves high Q×f of 113,620±680 GHz. CaY 0.8 Sm 1.2 Ge 3 O 10 ceramic demonstrates ε r = 10.31±0.01, Q×f = 50,510 ± 250 GHz, and τ f = −217.6±2.0 ppm/°C.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 9
·806
·
IF 4.5
Yifei Wang,Ruoxin Li,Bin Jia,Jun Liu,Guojie Zhang
Low-temperature sintering flue gas contains both nitrogen oxides (NOx) and carbon monoxide (CO), requiring bifunctional catalysts for concurrent pollutant abatement. Herein, CuSmTi composite oxides with an identical nominal composition were synthesized via impregnation, mechanical grinding, and sol–gel methods to examine the effects of preparation route on their structure, surface properties, and catalytic performance in coupled NH3-SCR and CO oxidation. CuSmTi-SG exhibited the best performance, achieving >40% NOxconversion at 125 °C, complete NOxand CO conversion at 200 °C, and nearly 100% N2selectivity over 100–300 °C, with stable performance over 24 h. It possessed a higher surface area (131.4 m2g−1), pore volume (0.230 cm3g−1), and smaller TiO2crystallite size (8.5 nm) than the other catalysts. Spectroscopic analyses showed that sol–gel synthesis altered the surface electronic states of Cu and Sm species, resulting in a higher Cu+fraction and greater amounts of medium-to-strong Lewis acid sites and labile surface oxygen species. In situ DRIFTS indicated that CO oxidation proceeded predominantly via a Mars–van Krevelen mechanism over Cu+sites, whereas NH3-SCR mainly followed an Eley–Rideal pathway. CO and NH3preferentially interacted with different surface sites, resulting in limited mutual inhibition. These results demonstrate that the preparation route can modify the structure and surface chemistry of CuSmTi catalysts without changing their nominal composition, thereby affecting their performance in low-temperature NOxand CO abatement.
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DOI
高影响因子
VACUUM
·
2026
·
IF 4.3
Zhipeng Jing,Aimin Liu,Xiaoqing Lu,Zihao Xu,Jinhui Wang,Fengguo Liu,Xianwei Hu,Zhenkun He,Zhongning Shi
Samarium-iron (Sm-Fe) permanent magnets represent a significant class of magnetic materials whose comprehensive magnetic properties are comparable to those of NdFeB magnets, and serve as one of the principal raw materials for producing the fourth-generation rare earth magnetic material SmFeN. In this study, Sm(CF 3 SO 3 ) 3 and FeCl 2 were dissolved in a solvated ionic liquid composed of 1,3-dimethyl-2-imidazolidinone (DMI) and LiNO 3 , and attempts were made to electrodeposit Sm-Fe alloy films at room temperature. The electrochemical behaviors of Sm(III) and Fe(II) in this ionic liquid were investigated using cyclic voltammetry. Furthermore, Sm-Fe films were electrodeposited from a DMI-LiPF 6 -Sm(CF 3 SO 3 ) 3 -FeCl 2 electrolyte, and the influence of deposition potential and metal salt molar ratio on the microscopic morphology of cathodic plating were investigated. The results indicate that the co-deposition of Sm with Fe can be achieved in this system, in which the reduction of Sm(III) proceeds via a two-step mechanism. The reduction of Sm(III) to Sm(II) is a diffusion-controlled irreversible process, with a diffusion coefficient of 5.34 × 10 −9 cm 2 /s at 333 K. The main phase identified in the cathode product was Sm 2 Fe 17 , in which the mass fractions of Sm and Fe were 32.57% and 19.80%, respectively. When the molar ratios of Sm(CF 3 SO 3 ) 3 to FeCl 2 were set at 20:1 and 60:1, Sm-Fe films with smooth and flat surfaces were successfully obtained by electrodeposition at potentials of −2.4 V and −2.6 V (vs. Ag).
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xiong Wang,Lingwei Zeng,Mengjia Chen,Zhouxi Li,Hu Zhou,Jianxian Zeng,Guoqing Liu,Tao Pang,Xiangcheng Wang,Yi Luo,Jianfeng Tang,Daqin Chen
Impurity doping is considered as a promising route to endow many functional materials with eminent properties, which may extend their applications in many research fields. As for the optical materials, great endeavors have been devoted to the fluorides over the past years, lanthanide orthovanadates receive less attention and focus. Herein, t-LaVO 4 :Ln 3+ (Ln = Eu, Dy, Sm, Tb) nanorods have been modified by the ZrOCl 2 addition, which are prepared through a hydrothermal synthesis technology. XRD, ICP, TEM, FT-IR and luminescence spectroscopy are employed to characterize the product. The morphology and luminescence performance of t-LaVO 4 :Ln 3+ nanorods could be modulated by deliberately control the ZrOCl 2 content. The average length and width of the nanorods decreases along with the increase of the ZrOCl 2 content. With regulating the content to 4 mol%, luminescence intensity are enhanced for several times and the decay lifetimes are prolonged to a certain extent. The growth mechanism and luminescence enhancement are discussed in detail. This report facilitates a novel approach for luminescence enhancement and widens the horizon for growth mechanism of LaVO 4 -based nanocrystals induced by impurity doping.
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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
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Qing-Gang Yue,Sheng-Hua Zhou,Bingxuan Li,Xin-Tao Wu,Hua Lin,Qi-Long Zhu
Multinary rare-earth chalcogenides with d-block transition metals have attracted considerable attention owing to their intriguing structural architectures and promising practical applications. In this work, three quaternary rare-earth sulfides, Ba4RE2Cd3S10 (RE = Sm, Gd, or Tb), have been obtained by the high-temperature solid-state method. These compounds are isostructural and belong to the noncentrosymmetric orthorhombic space group Cmc21 (No. 36). The basic structural unit contains unique two-dimensional anionic [RE2Cd3S10]8– layers, which are separated by Ba2+ cations. Remarkably, Ba4Sm2Cd3S10 exhibits a high second-harmonic-generation intensity (1.8 times that of AgGaS2) and a significantly higher laser-induced damage threshold (14.3 times that of AgGaS2), which is the first case possessing an infrared (IR) nonlinear optical (NLO) property in the quaternary AE/RE/TM/Q (AE = alkaline-earth metals; RE = rare-earth metals; TM = d-block transition metals; and Q = chalcogen) systems. Moreover, theoretical investigations of the structure–property relationship indicate that the combined action of various types of NLO-active units makes the main contribution to the SHG activity. This discovery may shed light on broadening the frontiers of IR-NLO materials.
研究领域:
材料化学
·
无机化学
·
非线性光学
·
固态化学
·
理论与计算化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 6
·8773-8778
·
IF 5.532
Xin Kang,Xiaohui Li,Xiaoyi Chen,Bo Gao,Pengjun Zhao,Zhaoyang Chen,Wenwen Kong,Aimin Chang
In this study, a series of novel negative temperature coefficient thermistor materials based on A 2 Ti 2 O 7 ( A = Sm, Eu, Y) titanate ceramics have been developed for high-temperature applications. The A 2 Ti 2 O 7 ( A = Sm, Eu, Y) ceramics showed cubic pyrochlore structures with dense morphology in X-ray diffraction and scanning electron microscopic analyses. These ceramics showed typical NTC characteristics in a wide temperature range of 673–1473 K, accompanied by resistance drift rates of 2.71%, 1.63%, and 4.95% for 400 h of ageing at 1173 K. The proposed ceramics have high resistivity and thermal constants B that ensure their better sensitivity at high temperatures and also show unique oxygen insensitivity. These properties outperform those of traditional high-temperature NTC materials composed of perovskite-type or scheelite-type ceramics, making A 2 Ti 2 O 7 ( A = Sm, Eu, Y) ceramics promising candidates for fabricating high-temperature NTC thermistors.
研究领域:
材料科学
·
陶瓷
·
电子材料
·
热电材料
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Lixia Chen,Nan Wang,Qiuhua Ma,Qiuling Chen
Sm 3 + /Sr 2+ -co-doped Bi 5 FeTi 3 O 15 (BFTO) nanocrystals were hydrothermally synthesized and embedded into a TeO 2 -based magneto-optical (MO) matrix using a melt-quenching technique. original BFTO nanocrystals exhibited 30–50 nm- hexagonal platelet-like morphology, which reduced to 20–35 nm after Sm 3+ /Sr 2+ doping due to lattice distortions and strain effects. The X-ray diffraction confirmed the crystal structure, while Raman and X-ray photoelectron spectra revealed charge redistribution and local asymmetry. Critically, Electron Paramagnetic Resonance analysis directly confirmed the presence of increased oxygen vacancies. These combined factors enhance the nonlinear optical (NLO) and chiroptical responses. The optimized 2 mol% Sm 3+ /Sr 2+ - Bi 5 FeTi 3 O 15 doped BFSS2 showed the highest third-order nonlinear susceptibility (χ (3) = 8.44 × 10 −11 esu), nonlinear refractive index (n₂ = 5.82 × 10 −10 m 2 /W), and nonlinear absorption coefficient (α 3 = 4.5 × 10 −11 m/W), demonstrating strong two-photon absorption (TPA) and Kerr nonlinearity. Photoluminescence spectra exhibited intense red emission at 610 nm and 645 nm, with BFSS2 achieving the highest circulary polarized luminescence (CPL) dissymmetry (g lum = −0.85) due to enhanced electric dipole –magnetic dipole interactions. Magnetic circularly polarized luminescence (MCPL) was significantly enhanced by Fe 2+ /Fe 3+ charge transfer and spin-orbit coupling. BFSS2 also exhibited the highest saturation magnetization (M s = 28 emu/g) and Verdet constant (28.3 rad/T·m at 633 nm), confirming strong magneto-chiral effects. These findings highlight the synergy of structural asymmetry, charge redistribution, and MO coupling in optimizing CPL, MCPL, and NLO properties, making BFSS2 a promising candidate for chiral photonic and magneto-optical applications.
研究领域:
材料科学
·
光子学
·
非线性光学
·
磁学
·
纳米材料
·
固态化学
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产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 23
·9228-9233
·
IF 1.938
Fen-fang Deng,Cong Ding,Yu Wang,Wen-ting Li,Li-li Liu,He Li
Samarium doped cerium dioxide (CSO) nanostructures possessing a shell-like morphology were synthesised by a simple hydrothermal method. A novel nanocomposite membrane, comprising of CSO nanostructures, chitosan (CH) and a room temperature ionic liquid (RTIL) was deposited onto an indium-tin oxide (ITO) electrode for developing a DNA biosensor related to the breast cancer gene. The properties of the CSO and nano-composite membrane were studied by thermogravimetry (TG), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The hybridization capacity of the DNA biosensor was studied by differential pulse voltammetry (DPV) using [Fe(CN)6]3−/4− as an indicator. Under optimal conditions, the fabricated DNA biosensor could quantify a wide range of target DNA concentrations over the range of 1 × 10−13 to 1 × 10−6 M with good linearity (R = 0.9981) and a low detection limit of 1.56 × 10−14 M (3σ). Results showed that the fabricated shell-like CSO nanostructures and RTIL could enhance the electrical conductivity synergistically, which has great potential application in sensitive electrochemical biosensors.
研究领域:
材料科学
·
生物化学
·
电化学
·
癌症诊断
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）