JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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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
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光子学
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非线性光学
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磁学
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纳米材料
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固态化学
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Science China-Materials
·
2021
·Vol. 64
·期 7
·1621-1631
·
IF 8.273
Wang Wenjie,Tian Yunfeng,Liu Yun,Abhishek Nalluri,Li Yitong,Chi Bo,Pu Jian
Sr-Co containing perovskite oxides are prospective air electrode candidates for reversible solid oxide cells (RSOCs). However, their efficiencies are limited by Sr segregation and the high thermal expansion coefficient (TEC) of Co-based perovskites. Herein, La 0.6 Ca 0.4 Fe 08 Ni 0.2 O 3− δ (LCaFN) is tailored as an Sr-Co-free perovskite air electrode for highperformance RSOCs. Compared with La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3− δ (LSFN) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− δ (LSCoF), LCaFN has a high electrical conductivity (297 S cm −1 ), TEC compatibility (11.2 × 10 −6 K −1 ) and improved chemical stability. Moreover, LCaFN has high oxygen reduction reaction (ORR) activity with a low polarization resistance (0.06 Ω cm 2 ) at 800°C. A single-cell Ni-YSZ/YSZ/gadolinium-doped ceria (GDC)/LCaFN-GDC operated at 800°C yields a maximum power density of 1.08 W cm −2 using H 2 as fuel. In the solid oxide electrolysis cell (SOEC) mode, the cell can achieve a current density of approximately 1.2 A cm −2 at 1.3 V with 70% humidity at 800°C. The cell exhibits good reversibility and remains stable in continuous SOEC and solid oxide fuel cell (SOFC) modes. These findings indicate the potential application of LCaFN as an air electrode material for RSOCs.
研究领域:
材料科学
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能源技术
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电化学
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陶瓷学
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燃料电池
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
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IF 4.495
Junlei Qi,Qian Liu,Minghe Cao,Yan Zhao,Hua Hao,Zhonghua Yao,Hanxing Liu
Discovering new materials with high breakdown strength is of great significance for scientific research and industrial applications. Here, we combine experiments and density functional theory (DFT) calculations to report a systematic study of two titanosilicates - A 2 TiSi 2 O 8 (A = Br, Sr) as a family of functional materials with wide band gaps, ultrahigh breakdown strength, and high thermal stability. The A 2 TiSi 2 O 8 materials possess ultrahigh electric breakdown ( E b > 200 kVmm −1 , at 200 ℃), and good temperature stability (the variation of capacitance 3 %, from −100 to 200 ℃). DFT results show that electrons are likely localized in the Si O and Ti O polyhedrons. The electron difference density map and density of states (DOS) results elucidate the wide band gaps in titanosilicate family due to the strong Si O and Ti O bonds, indicating that the semiconductive behaviors are similar. The temperature-dependent structural evolution (from −100 to 500 ℃) is investigated via in-situ Raman spectroscopy .
研究领域:
材料科学
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物理学
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Jiawen Ai,Weize Zhao,Quan Yu,Xiang Qian,Jianhua Zhou,Xinming Huo,Fei Tang
The mass spectrometer is an important tool for modern chemical analysis and detection. Especially, the emergence of miniature mass spectrometers has provided new tools for field analysis and detection. The resolution of a mass spectrometer reflects the ability of the instrument to discriminate between adjacent mass-to-charge ratio ions, and the higher the resolution, the better the discrimination of complex mixtures. Quadrupole ion traps are generally considered as a low-resolution mass spectrometry method, but they have gained wide attention and development in recent years because of their suitability for miniaturization and high qualitative capability. For an ion trap mass spectrometer, the mass sensitivity and resolution can be mutually constrained and need to be balanced by setting an appropriate scanning speed. In this study, a super-resolution U-net algorithm (SR-Unet) is proposed for ion trap mass spectrometry, which can estimate the possible ions from the overlapping ion peaks of low-resolution spectra and improve the equivalent resolution while ensuring sufficient sensitivity and analysis speed of the instrument. By determining the mass spectra of a linear ion trap mass spectrometer (LTQ XL) in Turbo and Normal scan modes, the same unit mass resolution as that at a scan speed of 16,667 Da/s was successfully obtained at 125,000 Da/s. Also, the experiments demonstrated that the algorithm is capable of the mass-to-charge ratio and instrument migration. SR-Unet can be migrated and applied to a miniature mass spectrometer for cruise detection of volatile organic compounds (VOCs), and the identification of VOC species in Photochemical Assessment Monitoring Stations (PAMS) was improved from 31 to 50 species with the same monitoring and analysis speed requirement. Further, super-unit mass resolution peptide detection was achieved on a miniature mass spectrometer with the help of the SR-Unet algorithm, which reduced the full width at half-maxima (FWHM) of bradykinin divalent ions (m/z 531) from 0.35 to 0.15 Da at a scan speed of 375 Da/s and improved the equivalent resolution to 3540. The proposed method provides a new idea to enhance the field mixture detection capability of miniature ion trap mass spectrometers.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
He-Di Yang,Sheng-Hua Zhou,Mao-Yin Ran,Xin-Tao Wu,Hua Lin,Qi-Long Zhu
Oxychalcogenides have gained widespread attention as promising infrared nonlinear optical (IR-NLO) candidates. However, high-performance oxychalcogenides have rarely been reported in the ultraviolet (UV) region owing to the low energy gaps (Eg < 4.0 eV). Herein, two non-centrosymmetric (NCS) oxychalcogenides with one-dimensional (1D) chain structures and wide Eg (>4.3 eV), namely, AEGeOS2 (AE = Sr and Ba), have been discovered by combined experiments and theory calculations as a new source of UV-NLO materials. Significantly, they exhibit excellent comprehensive performance comparable to the commercial UV-NLO material KH2PO4 (KDP), including large phase-matching ranges (>380 nm), sufficient second harmonic generation intensities (0.7–1.1 × KDP), high laser-induced damage thresholds (1.2 × KDP), wide transparent regions (0.26–12.2 μm), and good thermal stability (up to 1100 K). Moreover, systematic structure–activity relationship analysis illustrates that the 1D homochiral helical [GeOS2]2– chains composed of heteroanionic [GeS2O2] units make major contribution to the desirable UV-NLO performance. This work makes the two compounds shine out as new energy in the UV-NLO field and offers a new perspective for the exploration of structure-driven functional oxychalcogenides.
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Advanced Energy Materials
·
2022
·Vol. 12
·期 22
·2200392
·
IF 29.698
Peng Zhong,Kazuaki Toyoura,Lulu Jiang,Lubing Chen,Sara Adeeba Ismail,Naoyuki Hatada,Truls Norby,Donglin Han
A significant hydration and protonic conduction in La 2 NiO 4+ δ -based Ruddlesden–Popper (RP) oxides will enable their use as positrode materials in proton ceramic electrochemical cells (PCECs). Unlike perovskite electrolytes and positrode materials, where protons reside and jump on regular oxide ions, RP oxides such as La 2 NiO 4+ δ may contain oxygen interstitials and offer the possibility that protons locate on and migrate by help of these, suggesting a mechanism by which positrodes may operate by triple conduction. Here, theoretical calculations that support proton migration between interstitial oxide ions in the rock-salt layer via unshared oxide ions in the perovskite layer are reported. Furthermore, water contents of pristine La 2 NiO 4+ δ and La 2- x A x NiO 4+ δ ( A = Ca, Sr, Ba) are reported, showing that hydration increases with the level and basicity of the dopant. Hebb-Wagner blocking electrode measurements show significant partial protonic conductivity in all samples. The effects of doping on hydration and of p H 2 O on the p-type conductivity suggest that protons reside primarily on structural oxide ion, but a role of interstitial oxide ions for dissolution and migration of protons cannot be ruled out in cases with oxygen excess. The results are instructive for further studies and optimization of RP oxides as potential positrode materials for PCECs.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jia Li,Yimin Tang,Xiuwen Wang,Wei Kan,Libin Yang,Xin Jiang,Yukihiro Ozaki,Xiaoxia Han,Bing Zhao
Surface oxygen vacancy defects and energy band defects can be synchronously regulated to accelerate the charge transfer in a semiconductor–molecule system for boosting the surface-enhanced Raman scattering (SERS) performance of a semiconductor. Herein, alkaline earth metal Sr with a low electronegativity and a large atomic radius was selected as a dopant to prepare a Sr-doped TiO2 (SrnTiO2) SERS substrate, in which a simple Sr doping achieves a synchronous regulation of double defects (i.e., surface oxygen vacancy defect and energy level defect of Ti) in TiO2. Abundant surface oxygen vacancies and defect energy levels of Ti are jointly responsible for the greatly enhanced SERS performance of the substrate. On the optimal substrate Sr0.0100TiO2, the minimum detection limit of a nonresonance molecule, 4-mercaptobenzoic acid, can reach 1 × 10–9 M, and the enhancement factor is as high as 9.3 × 106. To the best of our knowledge, this is the highest SERS activity among the reported semiconducting substrates, even comparable to those of precious metals. Moreover, the SrnTiO2 substrate shows an excellent spectral reproducibility and ultrahigh stability, which can withstand the corrosions of strong acid and alkali and even can resist the oxidation of high temperatures for SERS detection.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Leyu Shen,Zhihong Du,Yang Zhang,Xu Dong,Hailei Zhao
Medium-entropy perovskites Sr(Fe α Ti β Co γ Mn ζ )O 3- δ (SFTCM) are investigated as potential cathodes for intermediate temperature solid oxide fuel cell (IT-SOFC). The effects of entropy on crystal structure, thermal expansion coefficients (TEC), electrical conductivity, oxygen surface exchange and bulk diffusion coefficients, electrochemical performance, and long-term stability of SFTCM are systematically investigated. High entropy facilitates the diffusion of oxygen ions but hinders the transmission of electrons. The SFTCM with higher entropy shows a lower TEC, displays suppressed strontium surface segregation, and delivers more stable polarization resistance. Although the catalytic activity towards oxygen reduction reaction was slightly reduced, the maximum power density of the LSGM-supported (250 μm) single cell with SrFe 0.25 Ti 0.25 Co 0.25 Mn 0.25 O 3- δ cathode can still reach 0.85 W cm −2 at 800 °C. All these results suggest that the medium-entropy SFTCM perovskites can be promising cathodes materials for IT-SOFC.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Guohui Wang,Qixin Zhang,Lailai Qin,Kaixuan Tan,Chunguang Li,Lianshun Li,Tinggui Yang,Xiaojuan Liu
A novel metal-organic framework (MOF) material, MIL-100(Fe)-DMA, was synthesized using the solvothermal method. The structure of the MOF was characterized using scanning electron microscopy-energy dispersive X-ray spectroscopy, N 2 adsorption–desorption isotherms, X-ray diffraction analysis, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Mössbauer spectroscopy. Batch adsorption experiments were performed to investigate the effects of initial Sr 2+ and Cs + concentrations, adsorption time, pH, and coexisting cations on the adsorption performance of the material. The adsorption mechanism was further elucidated using adsorption kinetics and isotherm models. The results indicated that the adsorption of Sr 2+ and Cs + does not significantly affect the MOF material structure. As reaction time and initial ion concentration increased, the adsorption capacity of MIL-100(Fe)-DMA for Sr 2+ and Cs + increased rapidly and then gradually reached equilibrium. Optimal adsorption occurred under alkaline conditions, with maximum adsorption capacity observed at pH = 8. The adsorption process for Sr 2+ and Cs + was well described by the pseudo-second-order kinetic model, the Weber–Morris model, and the Langmuir adsorption isothermal model. The adsorption process was mainly identified as monolayer chemical adsorption, influenced by multiple factors. Characterization combined with density functional theory calculations revealed that the unsaturated carboxylic acid groups on the surface of the MOFs play a crucial role in the interaction with Sr 2+ and Cs + .
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Feihu Li,Ying Tang,Jie Li,Weishuang Fang,Laiyuan Ao,Yu Wang,Xiangguang Zhao,Liang Fang
AGe 4 O 9 (A = Ba, Sr) ceramics with hexagonal structure were fabricated by solid-phase reaction. BaGe 4 O 9 sintered at 1060 °C had low ε r ∼9.8, high Q × f ∼78,400 GHz and τ f ∼ -44.2 ppm/°C, whilst SrGe 4 O 9 sintered at 1100 °C exhibited relatively high ε r ∼11.2, low Q × f ∼62,500 GHz and near-zero τ f ∼ -11.7 ppm/°C. The τ f of SrGe 4 O 9 was nearer to zero than that of BaGe 4 O 9 due to the smaller τ ε value and the smaller distortion of the [GeO 6 ] octahedrons. The ‘rattling’ cations at A-site contribute to comparatively high ε r , low Q × f and near-zero τ f values in Sr 1- x Ba x Ge 4 O 9 ceramics. This work presents a new idea of adjusting the microwave dielectric performance (MDP) of ceramics by changing the strength of the rattling effect at A-site.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wen-Zhong Lu,Burhan Ullah,Wen Lei,Tauqeer Ahmad
SrTiO 3 is a quantum paraelectric with cubic symmetry that resists long-range ferroelectricity, but targeted substitution and defect ordering can unlock polar states. Here, we report novel ferroelectricity and high microwave permittivity in a novel Sr (1-1.5 x ) Ce x TiO 3 (SCTO@ x for x = 0.5) (SCTO) solid solution. XRD and Rietveld refinement reveal stabilization of an orthorhombic Pmmm phase, supported by TEM superlattice reflections linked to TiO 6 tilts and antiparallel A-site displacements, while energy landscape analysis confirms this orthorhombic configuration as the strain-relieved ground state. Raman spectra show defect-activated E g and A 1g modes from oxygen-vacancy ordering, and XPS identifies a Ce 3+ /Ce 4+ ↔ Ti 3+ /Ti 4+ redox equilibrium with abundant vacancies. SEM/AFM reveal dense twin-striped grains that grow in size coarsen with sintering, reducing disorder. Dielectric spectra show a low-temperature relaxor response and a high-temperature transition: at 1270 °C both are diffuse and frequency-dependent, whereas at 1300 °C the high-temperature anomaly sharpens into a frequency-independent displacive ferroelectric transition (T C ∼ 449 °C, T CW ∼486 °C), supported by slim P–E loops, higher remanence, and TEM-confirmed domains. The coexistence of relaxor fluctuations with long-range ferroelectric order highlights a crossover from defect-induced short-range polarization to domain-driven coherence, which directly enhances microwave permittivity (ε r ∼82, Q × f∼12800 GHz, and τ f ∼ 205 ppm/°C) by combining soft-mode contributions with reduced extrinsic losses. These findings establish that reduction-controlled defect ordering stabilizes orthorhombic ferroelectricity absent in pristine SrTiO 3 , providing a clear design pathway for functional dielectrics through defect-engineered lattice symmetry.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Tian Duan,Wang Zhe,Zhang Jiaqian,Luo Ying,Zhang Zhenlong,Li Chao,Ye Kai,Peng Chaoliang,Chen Yiming,Lin Wenxue,Zhang Jingyan
This study examines attapulgite-bentonite-pyrite (AB 7 Fe) and zeolite-bentonite-pyrite (ZB 7 Fe) mixtures as buffer and backfill materials for nuclide migration using soil column experiments and COMSOL modeling. The results indicated that ZB 7 Fe possessed higher adsorption capacities for cesium (Cs) and strontium (Sr) compared to AB 7 Fe. Conversely, AB 7 Fe demonstrated superior retardation performance, more effectively slowing nuclide migration. After 1000 years, Cs and Sr concentrations in AB 7 Fe surpassed those in ZB 7 Fe. Additionally, nuclide migration increased with higher initiation pressure, dispersion, and diffusion coefficients. This research is crucial for improving the long-term safety of nuclear waste repositories.
研究领域:
环境科学
·
核废物管理
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