JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shaozheng Wang,Jingang Guo,Ruiting Hou,Lanlan Tian,Hui Zhang,Qingming Chen,Yule Li
The peculiar physical properties of La x Ca 1- x MnO 3 , such as the paramagnetic-ferromagnetic phase transition and colossal magnetoresistance, become prominent near the metal-insulator transition temperature (T MI ). Precise control of the T MI is essential for promoting applications in fields like magnetic sensing and magnetic storage, and for advancing fundamental research and material development in emerging areas such as multifunctional heterostructures and complex strongly correlated electronic structures. In this study, La 0.7 Ca 0.3 MnO 3 , a composition known for its sharp metal-insulator transition, was selected as the research subject. Using the sol-gel method, we partially substituted the A-site La element with six rare earth elements (Nd, Sm, Eu, Gd, Dy, Er) to investigate the relationship between the T MI , structural parameters, and the type of doping elements. Our results indicate that for a given doping element, the T MI decreases with increasing doping amounts and shows a linear relationship with the average ionic radius of the A-site. Notably, the slope of the linear equation decreases linearly with the reduction in the ionic radius of the doping element. Based on these observations, we proposed a relational formula between the T MI and the ionic radius of the doped element, as well as the average ionic radius of the A-site. Additionally, our formula can estimate the T MI for Sr 2+ doping, which shifts the transition to higher temperatures. These findings reveal the relationship between T MI and crystal structure variations, offering a promising pathway for the design and regulation of T MI in lanthanum-based manganites.
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Materials Today Sustainability
·
2024
·
IF 7.1
Jie Zhu,Tongxin Qu,Shengli Niu,Jisen Liu,Sitong Liu,Jie Geng,Zihao Yang,Abulikemu Abulizi
The development of reusable heterogeneous catalysts with acid-base bifunctions employing low-cost oil as a raw material is critical for optimizing the biodiesel synthesis process. In the present study, Sr–La/wollastonite bifunctional catalysts with the different Sr/La atomic ratios are synthesized using a straightforward impregnation technique. The results show that the Sr 7 La 3 /wollastonite catalyst establishes a biodiesel yield of 95.35% upon initial use and 85.14% after the fifth cycle of reuse, under the transesterification conditions of a catalyst content of 8 wt.%, methanol to oil molar ratio of 15, reaction duration of 3 h, and reaction temperature of 150 °C. The biodiesel yield of 91.62% is obtained even after the addition of 5 wt.% oleic acid, and the catalyst maintains a high biodiesel yield (>80%) for three reused cycles, which illustrates the good resistance to free fatty acids (FFAs). Meanwhile, the process parameters for transesterification are optimized utilizing Response Surface Methodology combined with Box-Behnken Design (RSM-BBD). With a methanol to oil molar ratio of 17.7 and a catalyst content of 6.4 wt.%, biodiesel yield is 96.08% at 149 °C for 3 h. This study revealed the enormous potential of the Sr–La/wollastonite bifunctional catalyst in biodiesel production.
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Chemical Physics Impact
·
2024
·
IF 3.8
Mingzhang Liang,Anze Shui,Mei Cai,Hulei Yu
Semiconductor photocatalysis is an efficient technique to degrade the pollutants from wastewater. Herein, the doping of elements and the construction of heterojunctions are used to expand the visible light region and improve the transfer of photogenerated electrons-holes. The La-ZnO/BiOCl (LZB) heterojunction has been synthesized via the hydrothermal method. Furthermore, LZB-0.30 heterojunction is found to possess the optimal photodegradation efficiency of 100 % for RhB solution under the visible light within 45 min. Its degradation rate is ten times faster than that of La-ZnO, owing to positive development of photostimulated charge carriers. In addition, the results demonstrate that LZB-0.30, as an ideal photocatalyst, has great potential applications in the treatment of contaminants, providing a feasible strategy for environmental protection.
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Small
·
2025
·
IF 12.1
Yi Wan,Wenrui Wei,Lin Li,Liang Wu,Haiying Qin,Xianxia Yuan
Reduced energy barrier induced enhanced oxygen evolution reaction (OER) kinetics can be achieved by implementing an efficient electrocatalyst. Herein, positive effect of lanthanum (La) single-atom modified hollow carbon sphere (HCS) support on OER activity of high-entropy sulfide (HES) material (FeCoNiCrCuAl)S has been reported. Briefly, La single-atom boosts the aggregation of electrons at adjacent Fe, Co, Ni, Cr, and Cu sites and dissipation of electrons at Al site in HES material, facilitating reconstruction of electronic structure and down-shifting their d-band center away from Fermi level, resulting in reduced adsorption energy of OER intermediates. As developed (FeCoNiCrCuAl)S@La-HCS depicts high OER performance with an overpotential of only 297 mV at 100 mA cm −2 , surpassing (FeCoNiCrCuAl)S@HCS (324 mV) and commercial RuO 2 catalyst (419 mV). This work provides an insight into the integration of single atom with high-entropy sulfide toward efficient oxygen evolution.
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PubMed
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Journal of Environmental Chemical Engineering
·
2024
·Vol. 12
·期 2
·112109
·
IF 7.4
Nguyen Tien Hoang
In this study, a novel Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La (denoted as SnO 2 -Sb@Ni-La(H)) was successfully prepared by hydrothermal method . The fabricated SnO 2 -Sb@Ni-La(H) electrode exhibited the superior electrocatalytic properties: high oxygen evolution potential (2.34 V vs. SCE), low charge transfer resistance (73.4 Ω cm −2 ), and highest degradation efficiency of benzoic acid (BA) ( k BA = 0.112 min −1 ), compared with other electrodes. The degradation rate of BA on the SnO 2 -Sb@Ni-La(H) was 3.6-fold, 4.7-fold, and 7-fold higher than that of SnO 2 -Sb@Ni-La(T), Ti/TiO 2 Blue, and Ti/SnO 2 -Sb, respectively. The study showed that •OH was the main radical contributing to pollutants degradation and the first-order degradation rate of organic pollutants in electrochemical oxidation (EO) process depends on their reactivity towards •OH ( k •OH,OP ), except for the case of methyl orange (MeO). Among the proposed combination methods, the combination of adsorption and electrochemical oxidation (rGO + EO process) exhibited excellent performance: the first-order degradation rate of P-nitrosodimethylaniline ( k RNO ) in (rGO + EO) process increased by 1.42-fold, compared with the EO process alone. This can be explained by the synergy effect from adsorption of RNO on rGO and the degradation of RNO during the EO process. The hydrothermal deposition combined with thermal decomposition can significantly improve the physical and electrochemical oxidation properties of the Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode: k RNO increased by 3.5-fold, compared with that of 1-time deposition by hydrothermal deposition. In addition, the effect of some operating parameters was investigated, including pH, current density, cathode size and distance of electrodes. This study provided a new method to prepare high-performance Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode and proposed some methods to improve the removal efficiency of the pollutants.
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Materials Today Physics
·
2023
·
IF 11.5
Ya-Xiang Han,Chun-Li Hu,Bing-Xuan Li,Jiang-Gao Mao
Aliovalent substitution is an effective route to design new nonlinear optical (NLO) crystals. Using SrCdSiS 4 as a parent compound, two new infrared NLO lanthanide thiosilicates, namely LnLiSiS 4 (Ln = La and Ce), have been successfully obtained through aliovalent substitution. Interestingly, these compounds exhibit [LiSiS 4 ] 3- layers composed of vertex- and edge-shared LiS 4 and SiS 4 tetrahedra that significantly different from the [LnSiS 4 ] 3- layers composed of edge-shared LnS 6 trigonal prisms (or LnS 7 monocapped trigonal prisms) and SiS 4 tetrahedra in other ALnSiS 4 (A = K, Rb, Cs, Ln = lanthanide) compounds with larger sized alkali cations. LnLiSiS 4 (Ln = La and Ce) also achieve balanced properties for good infrared NLO materials: largest SHG response among all known thiosilicates (2.0 and 2.1 × AgGaS 2 @ 2 μm for LaLiSiS 4 and CeLiSiS 4 respectively) with phase matching ability, high laser induced damage threshold (14 and 9 times of AgGaS 2 ), wide bandgap (3.71 and 2.92 eV), wide infrared transmission range (0.35–18 μm) and good thermal stability above 700 °C. This work not only enriches the structure chemistry of lanthanide thiosilicates, but also provides an efficient route to design new high performance IR NLO materials.
研究领域:
材料科学
·
晶体化学
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 10
·1-9
·
IF 2.584
Meng Ke,Li Wenhua,Tang Xingui,Guo Xiaobin,Liu Qiuxiang,Jiang Yanping
Ferroelectric materials with the typical perovskite structure are widely used in capacitors, ultrasonic devices, oil drilling, transducers, and other fields. Lead-lanthanum-zirconium-titanate ceramics co-doped with Sn and Ba , have been widely investigated. However, there is little attention has been focused on the dielectric properties of barium-lanthanum-zirconium-titanate. Thus, in this work, Sn doped Ba 0.955 La 0.03 Zr 0.02 Ti 0.98 O 3 ferroelectric ceramics were prepared via a classical high-temperature solid state reaction. Scanning Electron Microscopy (SEM) was used to observe the surface appearance of ceramics. The X-ray diffraction (XRD) patterns at room temperature, indicate that the ceramics are well crystallized. Impedance properties and dielectric properties reflect the characteristic of typical high temperature dielectric relaxation behavior. The conductive activation energy and the relaxation activation energy are obtained through the calculation of the Arrhenius law. The fitting results show that the dielectric relaxation behavior at high-temperature, was related to the oxygen defect. The electrical modulus verified the partial short-range carrier migration, also contribute to the high-temperature dielectric properties.
研究领域:
材料科学
·
固态物理
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Materials Today Physics
·
2025
·
IF 9.7
Qi Zhou,Jisheng Liang,Min Yao,Xiaoyang Wang,Zhengniu Pan,Shiyuan Zhao,Zhongwei Zhang,Jie Gao,Jun-liang Chen,Sijing Zhu,Lei Miao
BiSb alloys are promising thermoelectric materials for Cryogenic power generation with an optimal operating temperature range of 60 ∼ 300 K. Although the thermoelectric properties of n-type BiSb polycrystalline materials doped with metallic elements are generally enhanced, but the mechanisms underlying these improvements remain incompletely understood. Motivated by the high valence-electron activity and large atomic radius of La, we investigate the thermoelectric properties of La doped polycrystalline Bi 85 Sb 15-x La x (x = 0 ∼ 0.5), supplemented by density functional theory (DFT) calculations. The results indicate that La doping slightly increases the band gap and promotes conduction-band convergence, thereby optimizing the electronic structure. Consequently, the Bi 85 Sb 14.6 La 0.4 sample exhibits a high power factor of 3315 μW m −1 K −2 at 213 K. The higher Seebeck coefficient is attributed to an increased density of states effective mass induced by La doping. The enhanced electrical conductivity primarily results from La induced optimization of the electronic structure and grain-growth driven increases in carrier mobility. In addition, the accompanying lattice strain and microscopic morphological defects of La doping effectively suppress the lattice thermal conductivity to ∼0.79 W m −1 K −1 at 273 K. Consequently, this a peak ZT of ∼0.40 at 243 K and an average ZT of ∼0.34 in the range of 153 K ∼ 303 K. Our work offers a promising route to improving the thermoelectric performance of BiSb materials and extending their effective operating range at low temperatures.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·3274-3280
·
IF 2.22
Du Kang,Zou Zheng-Yu,Song Xiao-Qiang,Fan Jun,Lu Wen-Zhong,Lei Wen
Novel Ca RE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) microwave dielectric ceramics were prepared using solid-state reaction sintered at 1350–1400 °C for 5 h. CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) possessed an apatite structure with the P 6 3 /m space group. The lattice parameters a , b and c ; theoretical density and unit cell volumes of CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) gradually decreased when RE changed from La to Er, and a pure phase was formed at all compositions. The ε r , Q × f , and τ f values of the CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) ceramics were related to the total ionic polarizability, packing fraction, and polyhedral distortion of RE/Ca(2)O 7 , respectively. The optimal microwave dielectric properties of the CaRE 4 Si 3 O 13 ceramics ( ε r = 13.37, Q × f = 18,600 GHz, and τ f = − 17.8 ppm/°C) were obtained at RE = Er.
研究领域:
材料科学
·
物理学
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Yue Wang,Long Zhang,Sijie Zhang,Shuyue Li,Xingyan Wang,Wenhao Liu,Feng Yang,Xueyi Liu,Yi Hao,Ruixia Gao,Sicen Wang,Jingang An
Bacterial infections pose a severe global health threat with rising mortality, driving the need for alternative therapies. Chemodynamic therapy (CDT), which converts endogenous H2O2 into lethal hydroxyl radicals (•OH) via Fenton reactions, offers a promising solution. Copper peroxide (CuO2) nanodots have recently attracted considerable research interest because of their capacity to generate H2O2. Despite this advantage, their practical use in antibacterial applications is severely limited by their poor stability. In this study, we developed a near-infrared (NIR)-triggered nanoplatform, LA-CP@Fe3O4, by encapsulating CuO2-loaded iron tetraoxide nanoparticles with the phase-change material lauric acid (LA). This system synergistically combines a Fe2+/Fe3+-Cu+/Cu2+ dual-metal catalytic network for enhanced •OH generation with NIR-triggered photothermal activation (a photothermal conversion efficiency of 39.21%), allowing spatiotemporally controlled therapeutic release while stabilizing CuO2 nanodots. In vitro, the platform achieved 99.9% bactericidal efficiency via self-supplied H2O2 and targeted ROS generation. In vivo, it exhibited excellent biocompatibility, accelerated wound healing with an 88.0% reduction in wound area by day 7, and effective NIR-triggered antibacterial activity. These results collectively establish a groundbreaking approach for precision antibacterial therapy with strong clinical translation potential.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 3
·e70653
·
IF 4.2
Bowen Yin,Haoran Ren,Weijia Guo,Chongyang Zhang,Xingchen Zhang,Yutian Lu,Hui Zhang,Zhenxing Yue
Aluminum nitride (AlN) ceramics are widely used in high-power electronic devices due to their excellent electrical insulation, high thermal conductivity, and chemical stability. Doping with rare-earth oxides is a common modification method for AlN ceramics that enhances sintering behavior and thermal conductivity but simultaneously alters defect states, thereby affecting electrical properties. The evolution of these defects and their influence on electrical transport and heat conduction remain unclear. Herein, the defect behavior, electrical insulation, and thermal conduction of Y 2 O 3 , La 2 O 3 , and Sm 2 O 3 -doped AlN ceramics are systematically compared. A combination of direct current (DC) conductivity, electrochemical impedance spectroscopy (EIS), dielectric spectroscopy, and thermally stimulated depolarization current (TSDC) analyses confirms a pronounced defect “cleaning effect” induced by rare-earth dopants, with an efficiency ranking of Sm > La > Y. The results reveal that oxygen substituting for nitrogen sites and aluminum vacancies dominate the low- and high-temperature conduction processes, respectively. The influence of rare-earth doping on thermal conductivity is also evaluated. Notably, the samples doped with 4 wt% Y 2 O 3 exhibit the best electrical insulation and the highest thermal conductivity. This work provides important insights into achieving synergistic optimization of the electrical and thermal properties of AlN ceramics through defect engineering.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Fan Wang,Hongyu Zhou,Yinsheng He,Wenyue Zheng
High-entropy alloys (HEAs) are characterized by localized atomic-scale lattice distortions that can regulate the adsorption of intermediates during electrocatalysis. However, conventional 3 d HEAs exhibit limited atomic size mismatch, leading to insufficient lattice distortion and weak strain effects, which restrict adsorption tuning and spin-dependent electronic regulation for the oxygen evolution reaction (OER). Herein, a large-radius rare-earth element, lanthanum (La), was incorporated into a multicomponent HEA via a transient high-temperature shock strategy, suppressing phase separation and enabling a metastable single-phase LaFeCoNiMnMo HEA. Structural analysis confirms that La incorporation enhances lattice distortion and induces pronounced strain effects. The catalyst exhibits excellent OER performance, delivering an overpotential of 190 mV at 10 mA cm −2 and stable operation for 95 h. Magnetic measurements reveal that strain drives spin-state evolution, increasing the effective magnetic moment and spin polarization. Density functional theory (DFT) calculations demonstrate that strain induced by lattice distortion breaks the local crystal-field symmetry and modulates d -orbital splitting, leading to optimized adsorption energetics of oxygenated intermediates. This strain-spin-electronic structure coupling lowers the reaction energy barrier and accelerates OER kinetics. This work establishes a strain-driven spin-state regulation mechanism and provides a strategy for designing advanced electrocatalysts via rare-earth-induced electronic and spin modulation.
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