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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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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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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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.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 59
·88866-88881
·
IF 5.19
Xia Xuewen,Li Junqi,Chen Chaoyi,Lan Yuan-Pei,Mao Xisong,Chu Zhiyao,Ning Deyang,Zhang Junshan,Liu Fengyuan
Tuning morphology and doping additional rare earth (RE) cations are potential techniques to promote the photocatalytic performance of ceria (CeO 2 ), evaluating the collaborative effects of morphology and RE dopants is significant for producing high active ceria-based catalysts. So in this work, cubic, polyhedral and rod-like nanoceria doped with 10 mol % La (lanthanum), Y (yttrium), or Sm (samarium) were synthesized by a facile template-free hydrothermal method. Phases, morphologies, oxygen vacancies (OVs) concentration, energy band structure, photo-carriers separation/recombination, and photodegradation ratio toward methylene blue (MB) dye of as prepared ceria were studied. Results show that doped CeO 2 maintains a similar morphology structure with un-doped sample and the band gap narrows slightly. Y-doped nanoceria, with an improved separation and a reduced recombination of photo-excited electrons ( e − ) and holes ( h + ), owns a higher MB photodegradation ratio than that of samples doping with La or Sm, which is measured as 79.04, 84.43, and 85.59% for Y-doped cubic, polyhedral, and rod-like CeO 2 . The collaborative influence of morphology tuning and RE (La, Y, and Sm) doping on photocatalytic performance of nanoceria includes the effects of doped elements and the formation of OVs. The elevation of OVs concentration as well as the separation efficiency of photo-generated e − / h + are suggested to further enhance the photocatalytic performance of ceria.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2023
·
IF 2.8
Li Zezhong,Xu Jing,Liu Zhenlu,Liu Xinyu,Xu Shengming,Ma Yue,Li Qian,Shang Yan
The p–n type Sm 2 WO 6 -Co 9 S 8 heterojunction with two-dimensional coupling interface was successfully synthesized by electrostatic self-assembly. The unique rhombic morphology of Sm 2 WO 6 and Co 9 S 8 nanoparticles also effectively improve the light utilization efficiency. The intervention of Co 9 S 8 enhances the visible light absorption capacity of m 2 WO 6 /Co 9 S 8 . The Sm 2 WO 6 /Co 9 S 8 greatly increases the specific surface area and provides a rich reaction site. Recombination of photogenerated carriers in Sm 2 WO 6 /Co 9 S 8 heterojunctions is effectively inhibited. The p–n type Sm 2 WO 6 -Co 9 S 8 heterojunction results show that the optimized Sm 2 WO 6 /Co 9 S 8 heterojunction exhibits significant hydrogen evolution activity, and the optimal Sm 2 WO 6 /Co 9 S 8 -25 composite has 117.5 μmol hydrogen evolution activity, it’s close to four times Co 9 S 8 , close to 143 times Sm 2 WO 6 . The stability of the composite Sm 2 WO 6 /Co 9 S 8 is the better. Under the built-in electric field induced by p–n heterojunction, using of p–n heterojunction interactions and electron transport modes, the Sm 2 WO 6 /Co 9 S 8 can effectively achieve the remarkable effect of its internal carrier separation. This work also provides new opportunities for studying rare earth element tungstate photocatalysts. Graphical Abstract
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MATERIALS CHEMISTRY AND PHYSICS
·
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.
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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.
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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.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
C.X. Chen,X.Z. Zheng,W.B. Dai,C.Y. Ni,W.Y. Li,D. Wu
As energy consumption intensifies, energy saving and environmentally friendly phosphor-converted white light-emitting diodes (pc- w LEDs) have become the current research hotspots. The garnet-based CaY 2 Al 4 SiO 12 (CYAS) phosphors, with their abundant lattice sites and stable physical properties, are ideal candidates as phosphor hosts. Through comprehensive experimental and theoretical analyses, including XRD/Rietveld refinement and density functional theory (DFT) calculations, it was determined that Bi 3+ /Tb 3+ /Sm 3+ ions preferentially occupy the Y 3+ lattice site. The luminescence properties and thermal stability of CYAS: Bi 3+ /Tb 3+ /Sm 3+ have been extensively investigated. The quantum yield (QY) has been enhanced to 48.3 % due to energy transfer (ET), which is not a significant difference compared to existing phosphors, and by superposition of blue (Bi, 3 P 1 → 1 S 0 ), green (Tb, 5 D 4 → 7 F 5 ), and red (Sm, 4 G 5/2 → 6 H 5/2 ) emission, resulting in tunable spectrum and high-quality, full-spectrum white light emission. Finally, the w LED device with high color rendering index (CRI, 87), high luminous efficiency (LE, 74 lm·W −1 ), and low correlated color temperature (CCT, 4747.56 K) were fabricated by a remote ‘encapsulation’ packaging strategy, suggesting that the phosphor can be applied to high quality white light illumination.
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高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2025
·Vol. 72
·期 12
·6872-6878
·
IF 3.2
Xiyuan Zhang,Wenhua Zou,Junhong Duan
In this study, titanium dioxide (TiO ${}_{{2}}\text {)}$ nanoparticles co-doped with varying ratios of Eu and Sm were synthesized using a hydrothermal method. The energy bandgap ( ${E}_{\text {g}}\text {)}$ and conduction band minimum (CBM) of TiO2 nanoparticles doped with 0.45 at% Sm@0.1 at% Eu were adjusted from 3.43 and −3.95 eV to 3.30 and −3.53 eV, respectively, determined from ultraviolet–visible (UV–Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurements compared to undoped TiO2. CdSe quantum dot-sensitized solar cells (QDSCs) based on TiO2 doped with 0.45 at% Sm@0.1 at% Eu achieved an optimal power conversion efficiency (PCE) of 4.37%. Electrochemical impedance spectroscopy (EIS) revealed that the decrease in chemical capacitance ( ${\textit C}_{\mu }\text {)}$ and the increase in recombination resistance ( ${\textit R}_{\text {rec}}\text {)}$ of QDSCs based on 0.45 at% Sm@0.1 at% Eu-doped TiO2 photoanodes facilitate charge extraction and suppress charge recombination at the TiO2/electrolyte (EL) interface compared to undoped one.
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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.
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