SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhidong Jin,Jinbo Zhao,Lin Liu,Fei Liu,Zhou Wang,Fenglong Wang,Jiurong Liu,Yue Mou,Lili Wu,Xiao Wu
Water vapor greatly interferes with gas sensing characteristics of metal oxide semiconductors (MOS). Consequently, for the first time, Nd 2 O 3 -loaded In 2 O 3 porous nanorods were synthesized which exhibited excellent H 2 S sensitivity along with prominent humidity-independent characteristics, whereas pristine In 2 O 3 without Nd 2 O 3 showed deteriorated H 2 S sensing features under increasing ambient humid conditions in a wide operating temperature range. The mechanism of humidity-independent H 2 S sensing properties was researched via X-ray photoelectrons spectroscopy (XPS), in-situ Fourier Transform infrared spectroscopy (in-situ DRIFTS) and the corresponding gas sensing measurements, which is in close relations with the inhibition of chemisorbed oxygen and scavenging hydroxyl groups on In 2 O 3 surface induced by surficial Nd 2 O 3 component. This strategy poses a cutting-edge comprehending of temperature-dependent humidity-interference on MOS, paves a novel route for fabricating H 2 S sensors with exceptional sensitivity, selectivity and anti-humidity properties, which will be quite conducive for real-time exhaled breath analyses in disease diagnosis.
研究领域:
材料科学
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传感器技术
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医学诊断
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Ling,Peng Liao,Jiawei Zhu,Jianxin Wu,Caiwei Hu,Xianke Zhang,Jujun Yuan,Zuzhou Xiong,Xiurong Zhu,Chuicai Rong
Metal–organic framework (MOF) derivatives have emerged as promising candidates for designing lightweight, high-performance electromagnetic wave absorption (EMWA) materials owing to their tunable porosity, compositional diversity, and structural flexibility. In this study, a hybrid material (Nd/Fe-MOF) comprising Nd- and Fe-based MOFs was constructed via ion-exchange engineering based on an MOF-plus-MOF strategy, involving partial exchange between Nd³⁺ and Fe³⁺ ions. The subsequent pyrolysis of Nd/Fe-MOF yielded a particle-decorated bundle-like Nd 2 O 3 /Fe@C nanocomposite, which exhibited an exceptional EMWA performance with a minimum reflection loss (RL min )of −60.13 dB and an effective absorption bandwidth (EAB) of 5.0 GHz at a thin thickness of 1.8 mm. Moreover, Nd 2 O 3 /Fe@C also displayed an enhanced absorption with an EAB of 2.1 GHz (5.2–7.3 GHz) at low-frequency C band. This outstanding EMWA behavior can be attributed to the optimized impedance matching induced by the introduction of Nd 2 O 3 , and the prolonged propagation paths of EMW caused by the bundle-like structure. In order to present the practical application, CST simulation showed that the reduction value of radar cross section (RCS) of Nd 2 O 3 /Fe@C could reach up to 32.6 dB m² compared to the pure perfect electric conductor (PEC) substrate. Therefore, this study demonstrates the feasibility of employing ion-exchange engineering for the optimization of electromagnetic parameters and the subsequent development of high-efficiency rare earth–based absorbers.
研究领域:
材料科学
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纳米技术
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电磁学
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微波工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qiang Hu,Tongqing Chen,Lingling Yan,Junhui Yi,Hongxin Cai,Liang Chen,Lingli Wang
A series of Nd 2 O 3 -decorated ZnO nanosheets were successfully synthesized through a facile hydrothermal approach for n-butanol sensing applications. The results demonstrate that Nd 2 O 3 modification significantly improves the sensing performance. The optimal sensor with 7.5 wt% Nd 2 O 3 loading (denoted as Nd2) achieves a high response of 1503.73 toward 100 ppm n-butanol (68 times higher than that of pure ZnO), along with a rapid recovery time of 3 s and a low detection limit of 500 ppb. Furthermore, the sensor exhibits excellent selectivity against common volatile organic compounds (VOCs) and long-term stability. Comprehensive performance analyses reveal that the performance enhancement originates from the synergistic effect of two fundamental mechanisms: the formation of Nd 2 O 3 /ZnO heterojunctions that effectively modulate the electron-depletion layer, and the increased oxygen vacancy concentration that promotes surface redox kinetics. This work not only highlights the application potential of Nd 2 O 3 /ZnO heterostructures in n-butanol detection, but also provides a feasible material design strategy for developing high-performance gas sensors.
研究领域:
材料科学
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传感器与传感技术
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纳米材料
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气体检测
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环境监测
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanfen Liu,Wei Fan,Yu Bai,Zhicheng Yi,Baixu Zhu,Tiexiong Su
To improve the thermophysical performance of hafnate ceramics, we designed and synthesized two innovative high-entropy rare-earth hafnate ceramics, namely (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) 2 Hf 2 O 7 and (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Yb 0.2 ) 2 Hf 2 O 7 . The factors influencing their thermophysical properties were illustrated. Both ceramics exhibited a pure pyrochlore structure and displayed a favorable long-term phase stability at high temperature. Compared with the single-component La 2 Hf 2 O 7 , the high-entropy (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Yb 0.2 ) 2 Hf 2 O 7 material exhibited superior mechanical properties, including enhanced hardness (11.77 ± 0.33 GPa) and fracture toughness (2.23 ± 0.12 MPa·m 1/2 ) values, in addition to a high thermal expansion coefficient (11.1 × 10 −6 K −1 at 1100 °C) and a low thermal conductivity (1.31 W·m −1 ·K −1 at room temperature). The significantly higher thermal expansion coefficient of this ceramic is primarily attributed to the reduced electronegativity difference between its cations and anions, as well as its lower Debye temperature. Furthermore, the large mass and radius differences among the doped cations serve as key phonon scattering sources, effectively lowering the thermal conductivity without compromising the structural stiffness of the material. This work clarifies the pivotal role of elemental diversity and ionic size mismatch in synergistically modulating the thermophysical properties of hafnates, offering a novel material design paradigm for advanced thermal barrier coatings.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Su Li,Tianqi Jiao,Zhenyue Yu,Xiao Wu,Chunlin Zhao,Hao Yan,Min Gao,Cong Lin
The effects of amphoteric substitution on the piezocatalytic performance of Ba(Ti 0.2 Zr 0.2 Sn 0.2 Nb 0.2 Me 0.2 )O 3 (Me = Nd, Yb) high-entropy perovskite oxides (HPOs) were systematically investigated through the comprehensive structural characterizations and spectroscopic analysis. In contrast to Yb, which exclusively occupies the B-site, Nd exhibits the distinctive amphoteric behavior by simultaneously substituting at both A- and B-sites, inducing significant lattice distortion and localized charge imbalance that promotes the oxygen vacancy formation for charge compensation. These oxygen vacancies play multiple crucial roles in enhancing piezocatalysis, enabling the Nd-doped HPOs to exhibit an exceptional Rhodamine B (Rh B) degradation rate constant of 36.08 × 10 −3 min −1 , a 3.72-fold enhancement compared with the Yb-doped counterpart. The high configurational entropy in HPOs suppresses element segregation and phase decomposition, ensuring structural stability over multiple degradation cycles. This synergistic effect between amphoteric doping and entropy stabilization provides a new strategy for the environmental remediation via enhanced piezocatalysts.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xi Peng,Qi Ni,Guilin Wei,Fuxin Liu,Xiaoyan Shu,Fen Luo,Congcong Ding,Xirui Lu
The treatment of high-level radioactive waste with trialkyl phosphine oxide (TRPO) results in radioactive residues, necessitating the effective management of TRPO process waste to protect the environment. In this study, TRPO waste was immobilized in Gd 2 Zr 2 O 7 for the first time using solid-state reactive sintering at 1300 °C. XRD and Raman analysis results demonstrate that the waste solubility exceeds 50 wt .%, indicating a high incorporation capacity. With increasing TRPO waste addition, the pyrochlore phase initially transitioned to fluorite before reverting to pyrochlore. Valence state analysis suggests that fluorite-to-pyrochlore transition was driven by redox reactions of Ce at high temperatures, where Ce 4+ was reduced to Ce 3+ . The incorporation of Ce 3+ into the A-site of Gd 2 Zr 2 O 7 led to an increase in the r A /r B ratio, reaching a range of 1.46 to 1.78. In sample N5 (50 wt .% waste content), a Vickers hardness of 12.03 GPa was achieved, corresponding to the largest grain size and highest densification. Leaching experiments indicated that the normalized leaching rates of Nd and Ce after 42 d were both 10 -6 g·m -2 ·L -1 . These results suggest that variable valence elements in TRPO waste significantly influence the Gd 2 Zr 2 O 7 structure, and that samples synthesized under low-temperature sintering conditions exhibit excellent mechanical and chemical stability.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yi Zhou,Zhidong Pan,Yanmin Wang,Youjun Lu,Xiangyu Li,Shanjun Ke
Neodymium tungstate materials (i.e., Nd 2 WO 6 , Nd 2 W 2 O 9 , and Nd 2 (WO 4 ) 3 ) as novel allochroic inorganic pigments were synthesized by a solid-state reaction method. The pigments were characterized by X-ray diffraction, UV–visible–NIR spectrophotometry and colorimetry. The results show that the pigment with a monoclinic phase of Nd 2 (WO 4 ) 3 displays noticeable color changes from purple to blue, and then to gray under varying illuminants with a maximum color difference (Δ E∗ ) of 13.58. A relationship between crystal structure characteristics and allochroic function was investigated, and the corresponding mechanism was analyzed based on the Judd-Ofelt model and the crystal structure of the pigments. It is revealed that a lower symmetry in the Nd 3+ crystal environment and a higher covalency increase the probability of 4 f electronic transitions and illuminant sensitivity, thereby enhancing the allochroic effect.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Chunchun Li,Guobin Zhu,Deqin Chen,Jibran Khaliq
The growing demand for faster and more reliable wireless communication has increased the need for microwave dielectric ceramics with high performance and thermal stability. In this paper, we synthesized Bi1–4x(LaxNdxSmxEux)VO4 ceramics (0.025 ≤ x ≤ 0.1) via a conventional solid-state method at a low firing temperature range of 740–860 °C. Structural analysis was conducted using X-ray diffraction, high-resolution transmission eleectron microscopy, and Raman spectroscopy and showed a composition-driven phase transition from monoclinic scheelite (space group: I2/a) to tetragonal zircon (space group: I41/amd) near x ≈ 0.075, with a mixed-phase region observed at relatively lower substitution levels. This structural change had a direct influence on the dielectric properties: the permittivity (εr) decreased from 66.98 at x = 0.025 to 19.85 at x = 0.1, while the quality factor (Qf) increased from 7904 to 16240 GHz. A nearly temperature-stable point was identified at x = 0.055, where τf reached +8.42 ppm/°C, which is attributed to a compensation effect arising from A-site cation rattling. Far-infrared analysis confirmed that phonon absorptions dominate the dielectric response in the microwave region. To validate practical applicability, a microstrip patch antenna fabricated from the x = 0.055 ceramic achieved a return loss of −22.5 dB at 2.46 GHz, along with 98.8% radiation efficiency and a peak gain of 5.22 dB. These results highlight that controlling the multi-ion substitution and their ratios provides an effective strategy for tuning the phase composition and dielectric performance in BiVO4-based ceramics, which has a strong potential for ISM-band communication devices and emerging wireless technologies.
研究领域:
材料科学
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微波介质材料
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陶瓷工程
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无线通信
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电子材料
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Tao Jiang,Ming Cheng,Yujiao Wang,Shaoqiang Guo,Wentao Zhou,Yafei Wang
The selective removal of neutron-absorbing fission products from spent nuclear fuel is critical for enhancing neutron economy and enabling efficient recycling. In this work, we present a novel two-step dry reprocessing strategy that integrates NH 3 /HCl gas mixture treatment with liquid Sn extraction to achieve phase-selective separation of Sm, Nd, Ru, Rh, and Pd from simulated U 3 O 8 -based spent fuel. Thermodynamic analysis and experimental validation reveal that decomposition of NH 4 Cl at elevated temperatures serves as the generator of NH 3 /HCl gas mixture capable of selectively chlorinating Sm 2 O 3 and Nd 2 O 3 into soluble chlorides while reducing U 3 O 8 to UO 2 and converting RuO 2 , Rh 2 O 3 , and PdO to their metallic states (Ru, Rh, Pd). Subsequent dissolution tests in LiCl-KCl confirm that Sm and Nd are almost completely removed, with chlorination efficiencies of nearly 100%, while uranium loss can be minimized by controlling direct NH 4 Cl contact. The coupled liquid Sn extraction at 1173 K enabled the recoveries of metallic Rh, Rh, and Pd with a promising extraction efficiency. This integrated approach significantly simplifies the partitioning of key neutron poisons (Sm, Nd, Ru, Rh, Pd) compared to conventional aqueous or pyrochemical routes, reduces secondary waste, and preserves uranium in its UO 2 form.
研究领域:
核化学
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放射化学
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核燃料循环
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材料化学
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湿法冶金
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热力学分析
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Ting Jiang,Zhihao Wang,Zhuoheng Yu,Wei Wen
Willemite is a low dielectric constant ceramic that is well suited for millimeter-wave applications. This study explores the improvement of the dielectric properties of Zn1.8SiO3.8 ceramics by doping with Nd2O3 at molar fractions of 2%, 4%, 6%, and 8%, with the goal of enhancing their application in microwave filters. The phase structure, morphology, and vibrational modes of the samples were analyzed by using XRD, SEM, Raman, and IR spectroscopy. Additionally, their dielectric constants, quality factors, and temperature coefficients were measured. The results indicate that the ceramic sample doped with 6 mol % Nd2O3 and sintered at 1225 °C maintains a stable dielectric constant and achieves a high Q × f value of approximately 130,000 GHz, exhibiting significantly enhanced dielectric properties compared to pure Zn1.8SiO3.8 ceramics. Based on the optimized Zn1.8SiO3.8 −6 mol % Nd2O3 ceramic system, a band-pass filter with a center frequency of 5.15 GHz and a bandwidth of 200 MHz was designed and fabricated. Experimental results demonstrate that the filter exhibits a low insertion loss of −0.62 dB and a return loss exceeding −20 dB, highlighting its strong potential for 5G communication applications. This study demonstrates the effectiveness of rare earth doping in optimizing the performance of microwave dielectric materials and provides new ideas for the design of high-performance dielectric filters.
研究领域:
材料科学
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微波工程
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陶瓷材料
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无线通信
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 52
·期 1
·1318-1326
·
IF 5.6
Xinhao Song,Sha Wu,Ni Wang,Tongliang Liang,Yu Guo,Changzheng Hu,Laijun Liu,Liang Fang
Tetracycline hydrochloride (TCH), as a widely used antibiotic, poses an increasingly serious environmental residue problem, necessitating the development of efficient and environmentally friendly degradation technologies. Herein, a series of tungsten bronze-structured Ba 2-x Sr 3+x NdNb 7 Ti 3 O 30 (BSNNT, x = 0, 0.2, 0.4, 0.6) submicron powders was prepared using high-temperature solid-state sintering. The performance and mechanism of tribocatalytic degradation of TCH were systematically investigated. The results indicated that as the Sr 2+ doping concentration increased, the lattice distortion of BSNNT worsened, and its ferroelectric properties considerably improved. The sample with x = 0.6 demonstrated the best performance, with a residual polarization (P r ) of 1.946 μC/cm 2 and a TCH degradation rate reaching 93.67 % within 120 min. Further introduction of metal coatings (Ni, Cu, and Zn) revealed that Zn coating considerably promoted the generation of active material, achieving a degradation rate of 97.86 % within 60 min. Electrochemical impedance spectroscopy, electron paramagnetic resonance, and fluorescence spectroscopy confirmed that •OH, •O 2 − , and h + were the primary active species in the catalytic reaction and that the Zn coating stabilized radical generation. Furthermore, cycling stability tests showed that the BSNNT (x = 0.6) catalyst maintained a degradation efficiency of 94 % after five cycles, demonstrating excellent stability and practical application potential. This study provided new insights into the application of ferroelectric materials in the degradation of environmental pollutants and laid a theoretical foundation for the development of efficient and environmentally friendly TCH treatment technologies.
研究领域:
环境科学
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材料化学
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催化
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铁电材料
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污染物降解
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Yun Lv,Yanhong Wang,Yaling Dou,Ang Li,Jinkui Tang,Olga S. Volkova,Alexander N. Vasiliev,Hongcheng Lu
We report the synthesis and magnetic properties of three rare-earth magnetic compounds RE2O2CN2 (RE = Nd, Dy, Gd) with a frustrated triangular spin–lattice, as well as their thermal stability and Fourier transform infrared (FTIR) spectroscopy. The magnetic susceptibility results show paramagnetic behavior with no long-range order (LRO) down to 2 K in Nd2O2CN2 and Dy2O2CN2 due to spin frustration, which are further confirmed by the specific heat measurements, despite the large Curie–Weiss temperature for strong intralayer interaction through the RE–O–RE pathway (RE = Nd, Dy). While Gd2O2CN2 with a large spin exhibits LRO at 2.7 K, which should be caused by the non-negligible interlayer interactions. The field-dependent magnetization curves show a linear increase up to 7 T for Nd2O2CN2 and Gd2O2CN2, which are far from their saturation. While the magnetization of Dy2O2CN2 increases linearly below 3 T, then slowly increases to saturation, and the magnetization value is 6.62 μB at 7 T. Our work provides promising magnetic triangular lattice systems to further investigate frustration and quantum magnetism in rare-earth magnetic systems.
研究领域:
凝聚态物理
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材料化学
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磁性与磁性材料
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量子材料
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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）