JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 22
·1-13
·
IF 2.8
Ma Kangrui,Wu Jiawen,Wei Derong,Chen Jin,Rong Xuanting,Ding Ruyun,Gu Jia,Ma Xuetiao,Zheng Hui
With the development and use of the electronic and electrical equipment, solving electromagnetic pollution has become a top priority for human health. In this work, ternary co-doped (Ca 2 ⁺, Cu 2 ⁺, Sn 4 ⁺) ions were incorporated into M-type hexagonal barium ferrite (Ba 1-x Ca x Fe 11.6 Cu 0.2 Sn 0.2 O 27 ), and the effects of varying Ca 2 ⁺ doping levels on the crystal structure, surface morphology, and electromagnetic characteristics were thoroughly investigated. Structural characterizations confirms that Ca 2+ substitutes Ba 2+ sites, decreasing the grain size and lattice values while increasing the lattice strain. At x = 0.15, the Ba 1-x Ca x Fe 11.6 Cu 0.2 Sn 0.2 O 27 ferrite achieves the maximum value of saturation magnetization of 67.7 emu/g, the highest RL min value of -44.2 dB@14.3 GHz and effective absorption bandwidth of 3.04 GHz, showing potential as an effective material for absorption applications.
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CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Tao Yang,Zuhua Zhang,Huajun Zhu,Xuan Gao,Chendong Dai,Qisheng Wu
High-magnesium nickel slag (HMNS) has shown the potential as precursor in the production of alkali-activated materials (AAMs). This study re-examines the suitability of HMNS by comparatively investigating the reactivity of four different sourced HMNSs and analyzing impacts of the magnesium sources in HMNS on the reaction products of AAMs. Results show that the cooling way plays a determinant role of their mineral compositions. The air-cooled HMNSs contain only ∼30 wt% glassy phases, while the water-quenched one is dominantly amorphous. The reactivity of HMNS determined by the dissolution tests correlates well with the calculated depolymerization degree of glasses. HMNS indeed exhibits lower reactivity than the precursors commonly used for AAMs production, such as fly ash and blast furnace slag . In the HMNS samples in the sodium hydroxide solution, M-S-H, C-S-H and hydrotalcite are the main reaction products. The OH − ions in the aqueous system react with Mg 2+ to form the brucite, indicating that there is still a volume expansion risk if sodium hydroxide is used as activator. In comparison, only M-S-H and C-S-H gels are coexistent in the samples leached in the sodium silicate solution, because of the kinetic hindrance of soluble silicates for the formation of hydrotalcite and brucite.
研究领域:
材料科学
·
硅酸盐化学
·
无机非金属材料
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固废资源化
·
建筑材料
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Shu Li,Zhanmin Cao,Zhongnan Guo,Wenxia Yuan,Fan Sun,Hongmei Wang
This article reports a new perovskite compound Ca 6 Sb 2 O 11 . The X-ray powder diffraction technique was used to analyze its crystal structure. The results show that Ca 6 Sb 2 O 11 has a tetragonal structure with the I 4/ m space group, and the lattice parameters are a = b = 5.658 (1) Å, c = 7.984 (1) Å, α = β = γ = 90°. It exhibits a typical A 4 B' 2 B″ 2 X 12- x anoxic multi-perovskite structure with rock-salt ordering of the B-site cations. The compound's chemical composition and valence states were characterized through scanning electron microscopy-energy dispersion spectrum (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). The presence of oxygen vacancies was confirmed by electron paramagnetic resonance (EPR) spectroscopy. A chemical and structure transition temperature and the full melting temperature of Ca 6 Sb 2 O 11 were measured, with values of 1515 ± 3 K and 1720 ± 3 K, respectively. The density functional theory (DFT)-electron structure calculation results show that Ca 6 Sb 2 O 11 is an indirect wide-band gap (∼4.47 eV) semiconductor material , which agrees well with the experimental value (∼4.38 eV) obtained through diffuse reflection spectroscopy (DRS). Moreover, the top of the valence band and bottom of the conduction band are mainly contributed to by O-2p and Ca-3d states, respectively.
研究领域:
材料科学
·
固体化学
·
计算物理
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LANGMUIR
·
2021
·
IF 3.882
Liang Pan,Guoxi Li,Zhaoyang Wang,Dongbao Liu,Weikang Zhu,Chunyi Tong,Rilong Zhu,Shilin Hu
To reduce the corrosion of Q235 steel, environment-friendly and efficient N-doped carbon dots (N-CDs) were synthesized using 4-amino salicylic acid (4-ASA) and l-histidine (l-His) as precursors. The corrosion inhibition behavior of N-CDs for Q235 steel in 1 M HCl solution was systematically investigated using a weight-loss experiment, an electrochemical test, and corrosion morphology. Results showed that N-CDs could effectively inhibit the corrosion of Q235 steel, and the inhibitory efficiency reached 93% at 50 mg L–1. Quantum chemistry and molecular dynamics were used to study the inhibition mechanism of N-CDs. The results demonstrated that N-CDs exhibited a strong adsorption force on metal and the adsorption process followed the Langmuir adsorption isotherm, indicating physical/chemical mixed adsorption.
研究领域:
材料科学
·
环境科学
·
电化学
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Haining Ji,Dongqing Liu,Haifeng Cheng
Vanadium dioxide (VO 2 ) is a remarkable thermochromic material for application in adaptive infrared camouflage due to the reversible phase transition that is coupled with an abrupt change in infrared optical properties . However, the relatively high phase transition temperature and the unclear infrared optical modulation characteristics in the mid-infrared and far-infrared regions largely restrict its practical applications. Here, W-doped VO 2 nanoparticles were successfully prepared to reduce the transition temperature. When the effective doping amount of W was 1.70%, the transition temperature decreased to 43.2 °C. Importantly, the infrared properties of W-doped VO 2 nanoparticles were studied in both MWIR (3–5 μm) and LWIR (8–14 μm) thermal atmospheric windows, for the first time, which exhibited significant infrared optical changes, with emissivity variation of Δε = 0.17 and Δε = 0.28, respectively. These favorable results further promote the development of the adaptive camouflage.
研究领域:
材料科学
·
光学工程
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Tian-Tian He,Chun-Li Hu,Ya-Ping Gong,Jiang-Gao Mao,Fang Kong
In this work, we present a targeted design strategy that combines Group IIIA metal cation and fluorine anion to simultaneously enhance the band gap and birefringence in selenite-based system. Three new ultraviolet (UV) transparent selenite fluorides, SrAl(SeO3)F3 (1), BaAl(SeO3)F3(H2O)0.25 (2), and ZnGa(SeO3)2F (3), were successfully synthesized under mild hydrothermal conditions. Remarkably, all three compounds exhibit wide band gaps as well as large birefringence. In particular, ZnGa(SeO3)2F (3) demonstrates a pronounced birefringence value of 0.176 at 546 nm, representing the highest birefringence reported among all known selenites with a band gap above 5.0 eV. Theoretical investigations indicate that the strong optical anisotropy is predominantly attributed to the stereochemically active lone-pair electrons of Se(IV) cations. The [Zn2O8] dimers and the infinite [GaO4F]∞ chains in ZnGa(SeO3)2F (3) crucially facilitate the optimal spatial arrangement of [SeO3] groups. This study expands the structural diversity of selenite fluorides and provides an effective pathway for designing high-performance birefringent crystals suitable for UV applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 37
·期 1
·19
·
IF 2.8
Liang Jiran,Yu Yong,Bai Yunfei,Zhang Yingfu,Wu Tong,Zhang Dequan,Lei Dangyuan
Vanadium dioxide (VO 2 ) exhibits optical regulation properties in the solar band through a thermally induced insulator-to-metal phase transition near 68 ℃. Tungsten doping can decrease the VO 2 phase transition temperature ( Tc ) to near room temperature and enhance its applicability in smart windows for building energy saving. The optical regulation performance of tungsten-doped VO 2 (W-VO 2 ) is crucial for its smart window applications and varies with doping concentration. In this work, W-VO 2 nanoparticles were synthesized via a facile one-step hydrothermal method, and the effects of W doping on the Tc and particle morphology were systematically analyzed. This approach achieved a low Tc and improved optical performance without complex post-processing. The optical performance in the solar band was investigated with different doping concentrations ranging from 0.0 at to 2.0 at%. The sizes of the W-VO 2 nanoparticles ranged from 34.9 to 45.2 nm in diameter. The Tc decreased with increasing doping concentration and reached as low as 29.9 ℃ upon heating at a doping concentration of 2.0 at%. The W-VO 2 /PVP composite films exhibited excellent thermochromic performance. The luminous transmittance reached 52.71% and the solar modulation efficiency was up to 11.75% at a doping concentration of 1.0 at% and a volume fraction of 1.29%. These results demonstrate the potential of VO 2 nanoparticles in energy-saving smart window applications as a high-performance, low-cost material.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 22
·36739-36745
·
IF 5.6
Peilin Qing,Ning Guan,Yang Yang,Huizi Qiu,Weishuang Fang,Huaicheng Xiang,Ying Tang,Jie Li,Liang Fang
Crystal structure refinement and Raman spectroscopy were performed on Ca 3 M 2 Ga 2 GeO 12 (M = Ti, Sn, Zr) garnet-structured ceramics to explore the relationships between crystal structure, phonon modes, and microwave dielectric properties . The Ca 3 Ti 2 Ga 2 GeO 12 , Ca 3 Sn 2 Ga 2 GeO 12 , and Ca 3 Zr 2 Ga 2 GeO 12 ceramics were obtained by sintering at 1325–1475 °C for 6 h, and good microwave dielectric properties were achieved: ε r = 15.04, 9.53, and 11.89; Q × f = 59,515 GHz, 49,355 GHz, and 45,587 GHz; and τ f = −47.3 ppm/°C, −52.3 ppm/°C, and −43.0 ppm/°C, respectively. M 4+ (M = Ti, Sn, Zr) cations entirely occupied the octahedral site, leading to an average underbonding between cations and anions, a weak rattling effect, and measured ε r values deviating from theoretical values. The packing fraction and Raman FWHM (A 1g mode) correlated highly with the Q × f values. The negative τ f values were derived from the large positive temperature coefficient of permittivity ( τ ε ) and the temperature coefficient of ionic polarizability ( τ αm ).
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Mao-Yin Ran,Sheng-Hua Zhou,Bingxuan Li,Wenbo Wei,Xin-Tao Wu,Hua Lin,Qi-Long Zhu
Simultaneous regulation and control of non-linear second-harmonic-generation (SHG) coefficients (deff) and linear birefringence (Δn) of non-centrosymmetric (NCS) crystals is a crucial aspect of improving the non-linear optical (NLO) performance, yet it remains a huge challenge in modern laser techniques and science. Herein, a series of melilite-type oxide-derived NCS oxychalcogenides, Sr2MGe2OS6 (M = Mn, Zn, and Cd), are successfully designed and synthesized through a facile partial isovalent chemical substitution strategy. These isostructural compounds crystallize in the tetragonal NCS space group P4̅21m (no. 113) and feature unique two-dimensional Cairo pentagonal tiling layers composed of heteroligand [GeOS3] and tetrahedral [MS4] asymmetric building units (ABUs). Compared to the parent melilite-type oxides, the derived title compounds not only successfully realize the phase matchability transformation [i.e., from non-phase-matching (NPM) to phase-matching (PM)] but also greatly improve the IR-NLO performance (especially, simultaneously boosting deff and Δn). Sr2CdGe2OS6 exhibits the best comprehensive performance among oxychalcogenides, including a wide PM cutoff edge (>525 nm), a strong deff (0.8 × AgGaS2), a giant laser-induced damage threshold (19.2 × AgGaS2), a large band gap (3.62 eV), as well as a broad transmission cutoff region (0.28–12.0 μm). Furthermore, highly distorted [GeOS3] ABU in this melilite-type structure is proved to be the profitable bifunctional NLO-active unit, which can contribute to the search and design of novel IR-NLO crystals with a large Δn and a strong deff based on the experimental results and theoretical calculations. This work demonstrates the first examples of PM melilite-type oxychalcogenides and offers new perspectives on the phase matchability transformation through the partial isovalent chemical substitution approach, which will play a constructive role in the future design of high-performance IR-NLO heteroanionic materials.
研究领域:
材料科学
·
光学
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CRYSTENGCOMM
·
2021
·Vol. 24
·期 1
·95-106
·
IF 3.545
Yunping Zhoujin,Yang Tao,Panpan Zhou,Sean Parkin,Tonglei Li,Ju Guo,Faquan Yu,Sihui Long
Addition of methyl group(s) to either or both aromatic rings of fenamic acid (FA) afforded three FA derivatives (1–3), designed to investigate the effect on the polymorphic behavior of these compounds exerted by substitution. A relatively comprehensive polymorph screen led to the discovery of four polymorphs for compound 3, for which substitution took place on both aromatic rings, in contrast to the production of either two or one form(s) for compounds 1 and 2, both of which are mono-substituted. The observation indicated that both substitution position and pattern are important in the polymorphism of these compounds. The thermal properties of each system were investigated by differential scanning calorimetry (DSC). Conformational scans and Hirshfeld surface analyses were performed to study the mechanism of polymorphism and the intermolecular interactions contributing to the stability of each crystal form.
研究领域:
药物化学
·
晶体学
·
材料科学
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MICROBIAL PATHOGENESIS
·
2021
·
IF 3.738
Wenmin Yang,Minqiang Liu,Xi Yu,Yu Huang,Jie Zeng,Yongdong Dai,Hongping Luo,Qinqin Huang,Lin Fan,Jianping Xie
Mycobacterium tuberculosis ( Mtb ) infection is the major cause of tuberculosis. Mtb regions of difference (RD) genes are vital for survival of the pathogen within hosts and for the attenuation of the bacillus Calmette–Guérin vaccine. However, the function of most RD proteins largely remains unexplored. In the present study, we focused on Rv1515c, an RD6 member from M. tuberculosis , and characterised it as a cell surface-associated protein that functions in disrupting the cytokine profile and promoting endoplasmic reticulum stress-mediated apoptosis . Rv1515c expression in M. smegmatis , a nonpathogenic species, resulted in enhanced resistance of the bacterium to various in vitro stressors (such as low pH, sodium dodecyl sulfate , oxidative pressure, and nitrogen intermediate) and its cellular survival within macrophages. Our study is the first to identify the role of Rv1515c in the physiology and pathogenesis of mycobacterium .
研究领域:
微生物学
·
免疫学
·
传染病学
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PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Chengyan Gao,Guojun Zhou,Yawen Deng,Qiufeng Shi,Lei Wang,Haijie Guo,Jianwei Qiao
Eu 2+ -activated phosphors are prominent candidates for next-generation solid-state lighting, but their performance is often limited by incomplete Eu 3+ reduction and poor thermal stability. Herein, we present a universal strategy combining a two-step synthesis with charge compensation to simultaneously stabilize Eu 2+ centers and suppress parasitic Eu 3+ . Initially, M 2 SiO 4 :Eu 2+ ( Pnma ) precursors were synthesized to promote effective Eu 2+ incorporation. Subsequent P 5+ co-doping induces charge-compensated substitution (Si 4+ →P 5+ ). This structural evolution yields the target phosphor phases: the yellow-emitting Li 2 SrSi 0.96 P 0.04 O 4 :Eu 2+ ( P 3 1 21) and the green-emitting Li 2 BaSi 0.96 P 0.04 O 4 :Eu 2+ ( P 6 3 cm ) with excitation/emission maxima at 394/580 and 365/520 nm, respectively. Importantly, the heterovalent substitution facilitates the Eu 3+ →Eu 2+ reduction and optimizes the defect distribution. Consequently, the photoluminescence quantum yield (PLQY) is significantly enhanced from 26% to 78% for Li 2 SrSi 0.96 P 0.04 O 4 :Eu 2+ and from 32% to 83% for Li 2 BaSi 0.96 P 0.04 O 4 :Eu 2+ , along with improved thermal stability (93.3%@450 K). Fabricated near-UV pumped white light-emitting diodes (LEDs) incorporating these phosphors demonstrate superior color rendering ( Ra = 91.1) and stable electroluminescence across varying currents. The robust Eu 2+ stabilization and charge compensation paradigm paves the way for rational design of high-performance phosphors for advanced lighting.
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