CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·64796-64804
·
IF 5.6
Zhenghuang Quan,Zhoufu Wang,Hao Liu,Yan Ma,Shen Zhou,Pingtao Fang,Chao Shu
Yttrium oxide is widely recognized as a critical refractory material for superalloy purification smelting, owing to its high melting point, excellent vacuum chemical stability, and low alloy wettability. However, its inherent brittleness and high thermal expansion coefficient lead to poor thermal shock resistance, which severely restricts its practical industrial applications. To address this limitation, this study utilized La 3+ /Nb 5+ co-doping to fabricate Y 2 O 3 -based composites and systematically investigated their phase structure, microstructure, and overall properties. XRD Rietveld refinement and density functional theory (DFT)-based first-principles simulations confirmed that La 3+ preferentially substitutes Y 3+ at the Y1 lattice site, while Nb 5+ occupies the Y2 site, inducing significant lattice distortion and generating cation vacancies for charge balance. Microstructural observations revealed that co-doping triggers bimodal grain growth-characterized by small, loosely bonded grains with low Nb 5+ content and large grains containing intergranular pores attributed to high Nb 5+ substitution-resulting in increased apparent porosity but enhanced material toughness. Mechanical and thermal shock tests showed that while room-temperature flexural strength decreases, thermal shock resistance is drastically improved. When the La 3+ /Nb 5+ co-doping molar ratio was Y 2 O 3 : La 2 O 3 : Nb 2 O 5 = 1:0.050:0.050 (corresponding to the YLN10 sample), the composite exhibited the optimal overall performance: its room-temperature flexural strength reached 45.57 MPa, residual strength retention after thermal shock was 58.43 %, and elastic modulus retention was 87.91 %, effectively balancing mechanical properties and thermal shock stability. These improvements are primarily attributed to pore-mediated thermal stress dissipation and crack deflection effects. This work demonstrates that La 3+ /Nb 5+ co-doping is an effective strategy to balance the mechanical rigidity and thermal shock stability of Y 2 O 3 , providing a valuable reference for optimizing refractory materials for high-temperature superalloy smelting.
研究领域:
材料科学
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无机非金属材料
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高温功能陶瓷
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固态化学
·
计算材料学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yee-Shin Chang,Tai-Chen Kuo
ASr(YDy) 2 O 4 phosphors co-doped with La 3+ and Zn 2+ ions, prepared using a solid-state reaction method. The incorporation of La 3+ and Zn 2+ ions influences the crystal structure, surface morphology, and luminescent characteristics. X-ray diffraction analysis confirms a phase transition from SrY 2 O 4 to SrLa 2 O 4 with La 3+ substitution, while scanning electron microscopy reveals particle growth and morphological changes. The introduction of Zn 2+ enhances crystallinity and increases luminescence intensity at characteristic Dy 3+ emission peaks. Thermal quenching analysis demonstrates stable luminescence at elevated temperatures, indicating excellent thermal stability. The combined effects of La 3+ and Zn 2+ co-doping improve optical properties and material durability, making these phosphors promising for advanced photonic and lighting applications requiring high luminescent efficiency and thermal stability.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Metals
·
2026
·Vol. 16
·期 1
·
IF 2.5
Ning Zheng,Chenliang Peng,Xia Zhu,Weichang Kong,Yang Yang
The efficient recovery of rare earth elements (REEs) from low-concentration mine tailwater is crucial for resource sustainability. In this study, a novel composite adsorbent, sesame stalk biochar-supported zirconium phosphate (sBC/ZrP), was synthesized for the selective adsorption and recovery of La3+as a representative REE. The material was characterized using SEM-EDS, BET, XRD, FTIR, and XPS. Batch adsorption experiments were conducted to evaluate the effects of pH, coexisting ions, and the adsorption kinetics and thermodynamics. The results showed that sBC/ZrP exhibited a high adsorption capacity (up to 185.83 mg/g at 35 °C for 4 h) and strong selectivity for La3+, particularly in the presence of common competing cations, although Al3+demonstrated significant interference. The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm model, indicating monolayer chemisorption, and was determined to be spontaneous and endothermic. The material maintained over 90% adsorption efficiency after five consecutive adsorption–desorption cycles. The mechanism primarily involved complexation of La3+with the P-OH and Zr-O groups on the composite. This work demonstrates that sBC/ZrP is a highly efficient, stable, and reusable adsorbent with significant potential for the recovery of REEs from mining tailwater.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Pengju Xia,Wanyuan Li,Kaiting Wu,Yifeng Lei,Wubin Dai
In the process of studying newfangled phosphor-converted white-light-emitting diodes (pc-wLEDs), some basic and important objectives of phosphor, i.e., high chemical/thermal stability, color rendering index (CRI), and low correlated color temperature (CCT), should pass muster simultaneously. Herein, for the first time, a series of photoluminescence (PL) color-tunable single-phase Ca3Y(GaO)3(BO3)4: Dy3+/Sm3+/La3+ (CYGB: Dy/Sm/La) phosphors with good dispersivity, crystallinity, and size uniformity have been designed and synthesized via a facile solid-state reaction method. Structurally, based on XRD and Rietveld refinements, the tendentious occupations of Dy/Sm/La on the Y3+ site with a 9-coordinated number (CN) over other cationic sites are in line with the facts that the ionic radius and charge difference of Dy/Sm/La are much closer to Y3+ in 9-CN than Y3+ in 7-CN and Ca2+ in both 9- and 7-CN. Spectrally, thanks to the “cool” white PL from 4f–4f transitions of Dy and red-emitting from Sm, polychromatic PL including “warm” white light with high efficiency could be realized in CYGB: Dy/Sm via the regulation of doping content and energy transfer (ET). Intriguingly, the “abnormal” phenomena of zero-thermal-quenching in the range from room temperature (RT) to 573 K were observed, probably owing to the synergistic effects of electron–phonon coupling, ET, and structural defects. Moreover, by tridoping La3+ to legitimately adjust the site environments, the PL of both Dy/Sm could be further tuned because they all include hypersensitive transitions that are closely related to the crystal field environment. Finally, as a proof-of-concept fabrication, the pc-wLED assembled by a combination of the composition-optimized CYGB: Dy/Sm/La and an n-UV LED chip via remote “capping” packaging shows attractive performances, indicating its potential as an efficient phosphor for n-UV wLEDs.
研究领域:
材料科学
·
光学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6543-6549
·
IF 3.591
Ziqi Zhang,Xiang Ni,Kaida Yao,Siqi Zhang,Yang Liu,Yueqiu Sun,Xiangzhi Wang,Weimin Huang,Yan Zhang
Titanium has been applied to implants over the last decades due to its excellent biocompatibility and mechanical properties. However, there are still some drawbacks for titanium and its alloys to overcome. Thus, in this study, a novel electrochemical synthesis process has been developed to fabricate TiO2 nanotube array, hydroxyapatite and rare-earth (La3+) doped ZIF-8 nanoparticle composite coating, which can enhance the antibacterial and anti-corrosion property on the premise of minimizing the biocompatibility loss of titanium implants. Compared with traditional processing methods, electrochemical machining is more time-saving, energy-saving and environment-friendly. Thus, it provides an alternative way to produce medical implants.
研究领域:
生物材料学
·
医学工程
·
电化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Haiping Wang,Jingtian Zeng,Xin Wang,Xuan Xie,Yiming Hu,Kanjun Sun,Hui Peng,Guofu Ma
Regulating structural and electronic coupling in layered vanadium oxide is crucial for achieving high stability and fast reaction kinetics in aqueous zinc-ion batteries (ZIBs). Herein, we engineer a layered vanadium oxide cathode (LaPVO) through the intercalation of La3+ and in situ polymerized polyaniline (PANI) into the vanadium oxide framework. The La3+ functions as rigid structural pillars that expand and stabilize the interlayer spacing, while the conjugated PANI chains establish continuous electronic pathways and buffer mechanical strain. Through this interlayer regulation, the structural and electronic coupling within the vanadium oxide host is effectively reinforced, thereby accelerating Zn2+ diffusion, enhancing charge transport, and suppressing phase degradation during prolonged cycling. Comprehensive structural and spectroscopic characterizations verify the successful cointercalation of La3+ and PANI, accompanied by an increased V4+ content and pronounced interfacial charge redistribution. Owing to the synergistic structural-electronic regulation, the LaPVO cathode delivers a high reversible capacity of 358 mAh g–1 at 0.3 A g–1 and exhibits remarkable cycling stability, retaining 331 mAh g–1 after 200 cycles and 209 mAh g–1 after 1000 cycles. In addition, LaPVO demonstrates outstanding rate capability with minimal capacity decay under high current densities. Density functional theory calculations reveal strengthened Zn2+ adsorption, an increased density of electronic states near the Fermi level, and reduced Zn2+ migration energy barriers, providing fundamental insight into the experimentally observed performance enhancement. This work establishes a general and effective interlayer engineering strategy for designing robust vanadium-based cathodes, offering new opportunities for grid-relevant aqueous ZIBs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 4
·287
·
IF 2.8
Tang Ruxuan,Chen Yuan-Bin,Su Xiuyuan,Tang Ling
With the rapid development of 5G/6G mobile communication technology, microwave dielectric materials are facing increasingly strict performance requirements. As core fundamental materials for modern communication systems, performance optimization of microwave dielectric ceramics has become a research hotspot. Addressing the limitations of single-phase ceramic materials, dense microwave dielectric ceramics of (Nd 1- x La x ) 2 [Zr 0.89 (Bi 0.5 Ta 0.5 ) 0.11 ] 3 (MoO 4 ) 9 ( x = 0.01, 0.03, 0.05, 0.07) were prepared by the conventional solid-state reaction method. The experimental process involved 550 °C pre-sintering followed by gradient sintering at 600–725 °C (4 h holding time). X-ray diffraction (XRD) analysis confirmed that all samples exhibited trigonal crystal structure with \(R\overline{3} c\) space group. The lattice parameters were obtained by Rietveld refinement method. Scanning electron microscopy (SEM) characterization indicates that compactness has a significant impact on the dielectric constant ( ε r ) and the quality factor ( Q × f ). Raman spectroscopy analysis indicated strong associations of ε r and Q × f values with characteristic peak shifts and full width at half maximum ( FWHM ), respectively. When sintered at 675 °C, the NLZBTM ( x = 0.03) ceramics exhibited exceptional comprehensive performance: ε r = 11.24 ± 0.02, Q × f = 116,914 ± 5738 GHz, and τ f = − 37 ± 1.5 ppm/℃. The bond property analysis based on the P–V–L theory shows that the ionicity of the Nd/La–O bond makes the greatest contribution to εᵣ , while the covalency of the Mo–O bond significantly affects the Q × f value and τ f parameter. It is noteworthy that this material achieves low-temperature sintering at 675 °C while maintaining excellent microwave dielectric properties, demonstrating significant potential as a candidate material for low-temperature co-fired ceramics (LTCC).
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高影响因子
CATALYSIS TODAY
·
2014
·
IF 3.309
Huiling Li,Aojie Deng,Junli Ren,Changyu Liu,Wenju Wang,Feng Peng,Runcang Sun
One of the most promising strategies for furfural production is to extract continually the target product from the aqueous solution utilizing organic solvents. With the aim to develop an ecologically viable catalytic pathway for furfural production without the addition of mineral acids, we presented a modified biphasic system using a solid acid (SO 4 2− /TiO 2 -ZrO 2 /La 3+ ) as catalyst for producing furfural from xylose. Different kinds of aprotic organic solvents (DMSO, DMF and DMI) in water phase and 2-butanol in organic phase (MIBK) were investigated as reaction media. Furfural yield and xylose conversion efficiency were dependent on the amounts of aprotic organic solvents and 2-butanol, the solid/liquid ratio, and the volume ratio of the organic phase and the aqueous phase as well as the reaction temperature and time. As a result, DMI showed the best performance on improving furfural yield during the furfural production. 3563.3 μmol of furfural/g of xylose with 97.9% xylose conversion efficiency was obtained after 12 h at 180 °C when the volume ratios of water to DMI and MIBK to 2-butanol were 8:2 and 7:3, respectively.
研究领域:
生物化学
·
催化化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ziyi Jiang,Xintong Cao,Enrou Mei,Ye He,Jiapeng Yang,Zhaoping Chen,Yang Li,Xiaojuan Liang,Weidong Xiang
Perovskite quantum dots (PQDs) are widely used in the backlight field of liquid crystal displays (LCDs) due to their narrow-band emission and high color purity. However, their high cost and insufficient stability seriously restrict the industrialization process. This study innovatively adopted the environmentally friendly Pb(OH)2 to replace the traditional PbBr2 lead source, successfully reducing the raw material cost by nearly 50%. At the same time, it significantly improved the optical performance of CsPbBr3@glass by reducing the formation of bromine vacancies. By further introducing La3+, the prepared La3+@CsPbBr3@glass achieved a PLQY increase from 48 to 86%, and maintained a PL intensity of 87% under harsh conditions (60 °C, 90% RH, and continuous exposure to 8000 nit blue light for 40 days), breaking through the stability bottleneck. The color gamut of the CsPbBr3&CsPbBr1I2@glass@PET light conversion film developed on this basis is 94.75% of the NTSC 1953 standard and 70.74% of the Rec.2020 standard. When they are applied to LCD screens, they significantly enhance color performance. It provides an efficient, stable, and low-cost industrial solution for quantum dot film technology.
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DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Qiaoyun Liu,Yifeng Yu,Changjiang Liu,Yuhang Liu,Liangjie Yuan,Zheng Wang,Aixi Yu
Lanthanum (La) compounds have attracted much attention because of low toxicity and biocompatibility. In this study, a series of La-doped magnesium phosphate composites bone repair materials (LMPCs) were prepared by the precursor method, in which the molar ratio of lanthanum was 1%, 3% and 5%, respectively. The results of X-ray powder diffraction, scanning electron microscope and compressive strength test show that La-doped magnesium phosphates (LMPs) synthesized by the precursor method have uniform particle distribution, high purity and excellent degradability. In vitro research results show that LMPCs exhibited reliable biosafety and excellent bioactivity. The introduction of lanthanum enhances the antibacterial activity of Escherichia coli and Staphylococcus aureus of the composite. Furthermore, the combined system of released La 3+ and Mg 2+ is more conducive to promoting the proliferation of mesenchymal stromal cells (MSC) and angiogenesis of human umbilical vein endothelial cells (HUVECs) when the content of lanthanum is 3% (referred to as LMPC-2). By up-regulating the expression of alkaline phosphatase (ALP) and Runt-related transcription factor 2 (RUNX2), LMPC-2 is prominent in promoting osteogenic differentiation, and mineralized calcium deposition in vitro . Moreover, the results of micro-CT, H&E and Masson staining confirmed the beneficial effect of the combined system of La 3+ and Mg 2+ on the repair of rat skull defects in vivo . These achievements will provide new strategies for improving the biological activity of LMPCs and provide reference value for bone repairing in the clinic.
研究领域:
生物材料
·
生物医学工程
·
组织工程
·
骨再生
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Huabei Qi,Ding Zhou,Xiaohui Li,Wei Jing,Weiwei Li,Jiayue Xu
Nanocrystalline powders and pressureless sintering (NC-PLSH) were used in a H 2 atmosphere to fabricate 4 at.% La 3+ doped (Tb x Lu 0.96−x ) 2 O 3 magneto-optical transparent ceramics. La 3+ was utilised as a sintering aid, and Lu 3+ was used as a phase stabiliser . A component of the (Tb x Lu 0.96−x La 0.04 ) 2 O 3 magneto-optical material was designed and investigated based on powder sinterability and green compact sintering. Transparent (Tb x Lu 0.96−x La 0.04 ) 2 O 3 ceramics were obtained by using a one-step sintering process in H 2 atmosphere, without the need for subsequent hot isostatic pressing . The in-line transmittance of the as-polished 4 at.% La 3+ :(Tb 0.8 Lu 0.16 ) 2 O 3 ceramic was 79% at 1400 nm. The measured Verdet constant at wavelengths of 633 nm and 1064 nm was 354 rad/(T·m) and 100.2 rad/(T·m), respectively. The required length of the (Tb 0.8 Lu 0.16 La 0.04 ) 2 O 3 ceramics was 63% less than that of Tb 3 Ga 5 O 12 ceramics.
研究领域:
材料科学
·
陶瓷学
·
光学材料
·
磁光学
·
固体物理
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DOI
高影响因子
E-POLYMERS
·
2016
·Vol. 17
·期 3
·243-248
·
IF 0.812
Weidong Han,Bin Ding,Mira Park,Fuhai Cui,Su-Hyeong Chae,Hak-Yong Kim
Poly(vinyl pyrrolidone) (PVP)/La 3+ /Zr 4+ precursor nanofibrous membranes (LZPNM) with various Zr contents were synthesized via a simple electrospinning method. By controlling the Zr incorporation, the tensile properties of precursor membranes dramatically change from 0.77 to 1.73 MPa. Meanwhile, the average diameters of precursor nanofibers increase with the increase of Zr contents (from 283 to 535 nm). In addition, flexible La 2 O 3 -ZrO 2 nanofibrous membranes (LZNM) were obtained by calcination of corresponding precursor membranes. Furthermore, the structures and morphologies of the precursor membranes were investigated using X-ray powder diffraction analysis (XRD) and field-emission scanning electron microscopy (FE-SEM). The surface functional groups and thermal properties of the precursor membranes were measured via Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA).
研究领域:
材料科学
·
纳米技术
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）