Article
Chemistry, Physical
D. Kasprowicz, K. Jaroszewski, P. Gluchowski, E. Michalski, A. Majchrowski
Summary: Single crystals of Bi2ZnOB2O6 doped with Er3+ and Yb3+ ions were grown using the Kyropoulos method, exhibiting high values of nonlinear optical coefficients and efficient luminescence of Er3+ ions. The study investigated the structure, vibrational, and luminescent properties of the crystals for the first time, revealing the potential for use in integrated new-generation laser devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Applied
Binbin Jiang, Lihe Zheng, Dapeng Jiang, Handi Yin, Jiangang Zheng, Qiuhong Yang, Guofeng Cheng, Liangbi Su
Summary: Ytterbium and rare earth ions codoped CaF2-SrF2 single crystals were fabricated and their optical properties were analyzed, showing potential applications in high-power solid-state lasers. The study confirmed the effects of different rare earth ions on the crystal structure and optical performance.
JOURNAL OF RARE EARTHS
(2021)
Article
Materials Science, Ceramics
M. Elisa, S. -M. Iordache, A. -M. Iordache, I. C. Vasiliu, C. E. A. Grigorescu, B. A. Sava, L. Boroica, A. V. Filip, M. C. Dinca, C. Bartha, N. de Acha, C. Elosua Aguado
Summary: Phosphate glasses doped with Eu, Er, Yb-Er, and Dy were prepared using a wet-route processing method, followed by XRD, UV-Vis, FTIR, and Raman spectroscopy analysis. Different doping ions showed varied effects on the luminescence spectra, with a decrease in emission intensity observed as temperature increased.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Andrei Novitskii, Illia Serhiienko, Sergey Novikov, Yerzhan Ashim, Mark Zheleznyi, Kirill Kuskov, Daria Pankratova, Petr Konstantinov, Andrei Voronin, Oleg A. Tretiakov, Talgat Inerbaev, Alexander Burkov, Vladimir Khovaylo
Summary: In this study, the addition of rare-earth elements into the Bi-O charge reservoir layer of BiCuSeO results in an increase in charge carrier concentration and effective mass. The electronic transport properties are significantly improved in a wide temperature range. The substitution also leads to a noticeable decrease in lattice thermal conductivity. The maximum zT value obtained for the Bi0.92La0.08CuSeO sample is nearly 30% higher than that of pristine BiCuSeO.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Ceramics
Xin Li, Jiangkun Cao, Mokang Huang, Mingying Peng
Summary: Bismuth (Bi) doped glasses and fibers have gained attention for their broad and long lived near infrared (NIR) emission. Codoping rare earth ions is a feasible way to modulate the NIR emission properties of Bi, but limited success have been achieved. By investigating nonactive rare earth (RE) codoped aluminoborate glasses, it is found that the addition of nonactive RE ions changes the glass structure and optical basicity, altering the optical properties of Bi.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
XueFeng She, Huai Zhang, ZhenLong An, JingSong Wang, QingGuo Xue
Summary: The study found that an increasing La2O3 content decreases the polymerization degree of RE slag, leading to the appearance of additional crystal phases, reduced crystallization temperature, and enhanced crystallization of the RE phase.
CERAMICS INTERNATIONAL
(2021)
Review
Chemistry, Inorganic & Nuclear
Daniele Paderni, Luca Giorgi, Vieri Fusi, Mauro Formica, Gianluca Ambrosi, Mauro Micheloni
Summary: Rare earth elements (REEs) are a group of elements playing critical roles in modern applications, with scientists showing strong interests in their new applications. However, the development of chemical sensors suitable for selective sensing of REE ions remains a challenging task due to their complicated coordination properties.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
O. Smitiukh, O. Marchuk, Y. M. Kogut, V. O. Yukhymchuk, N. Mazur, G. L. Myronchuk, S. M. Ponedelnyk, O. Cherniushok, T. O. Parashchuk, O. Y. Khyzhun, K. T. Wojciechowski, A. O. Fedorchuk
Summary: In this study, the effect of rare earth doping (Pr, Eu, Yb) on the crystal structure and optical properties of Ag3AsS3 crystals was investigated. The analysis showed that the rare earth elements are located in the Ag sites of the crystal lattice. The increase in second harmonic generation intensity was attributed to the decrease in bandgap and increased electron-phonon interaction in rare-earth-doped Ag3AsS3 crystals. The results suggest that rare-earth-doped Ag3AsS3 crystals have potential applications in non-linear optical devices in the infrared frequency range.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Physical
N. M. Yitzhak, O. Girshevitz, A. Haran, A. Butenko, M. Kaveh, I. Shlimak
Summary: Raman spectra of monolayer graphene samples were measured, and it was found that the positions of Raman lines are redshifted in free-standing samples, which is caused by irradiation with protons or helium ions. This redshift is attributed to an electronic mechanism for changing the graphene structure, depending on the charge and velocity of the incident ions.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
H. T. Haile, F. B. Dejene
Summary: In this study, the structural, morphological, and photoluminescence properties of Y2SiO5:Ce3+ thin films deposited by pulsed laser deposition at varying oxygen deposition pressures were investigated. It was found that higher oxygen deposition pressures led to increased photoluminescence intensity, and the size of the nanoparticles deposited in the films ranged from 0.39 to 0.55 μm. The maximum average activation energy was obtained for films deposited at 1.5 mTorr, with a value of 0.438 eV.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
J. M. Santos, J. A. daSilva-Santos, A. J. S. Silva, L. de los Santos Valladares, N. O. Moreno
Summary: The rare earth iron garnets R3Fe4.9Al0.1O12 (R = Sm, Gd) were successfully synthesized and characterized in this work, showing that the inclusion of Al instead of Fe slightly decreases the temperature of magnetic ordering. The samples displayed different crystallite sizes and morphology, with the structural analysis indicating a cubic garnet structure. Raman spectroscopy revealed the presence of vibrational modes related to the garnet structure and spin-phonon coupling behavior near the Neel temperature. Magnetization measurements confirmed a ferrimagnetic order with slightly lower T-N compared to undoped ferrite garnets.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Tatyana B. Bekker, Alexey A. Ryadun, Alexey V. Davydov, Vladimir P. Solntsev, Veronika D. Grigorieva
Summary: Single crystals of undoped and rare-earth-doped Ba-12(BO3)(6)[BO3][LiF4] were grown from high-temperature solutions. The luminescence of these crystals at specific excitation wavelengths shows potential for converting LED emissions into white light.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Environmental Sciences
Marta Sevillano-Gonzalez, Javier Gonzalez-Salamo, Francisco J. Diaz-Pena, Cintia Hernandez-Sanchez, Sergio Catalan Torralbo, Airan Rodenas Segui, Javier Hernandez-Borges
Summary: This study reveals the presence of microplastics in the digestive tracts and gonads of Diadema africanum sea urchins from Tenerife, Canary Islands, Spain. The microplastics identified were mainly microfibers, fragments, and films, with blue and translucent white being the predominant colors. The study also showed that the microplastics composition varied between the two sampling points, but not between the different tissues examined.
MARINE POLLUTION BULLETIN
(2022)
Article
Nuclear Science & Technology
Suvendu Kumar Barik, Abhiram Senapati, S. Balakrishnan, K. Ananthasivan
Summary: Sodium aluminium phosphate (NAP) glass has been found to be an optimal choice for immobilizing minor actinides. The addition of rare-earths and Al2O3 significantly modifies the structure of the glass. Increasing dopant concentration improves the glass's melting point, glass transition temperature, and thermal stability, while decreasing its fragility. The addition of rare-earths enhances the strength of the glass up to a certain concentration, beyond which the rigidity of the structure decreases.
PROGRESS IN NUCLEAR ENERGY
(2022)
Review
Chemistry, Multidisciplinary
Ping Chen, Wei Han, Mei Zhao, Jianwei Su, Zexin Li, Dongyan Li, Lejing Pi, Xing Zhou, Tianyou Zhai
Summary: 2D rare earth materials have shown fascinating luminescence, magnetism, and electric properties with potential applications in next-generation devices. This review focuses on crystal structures, synthesis methods, properties, and novel photodetector constructions using RE elements, highlighting the importance of exploring new compounds and broadening applications in this field.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
T. Zhezhera, P. Gluchowski, M. Nowicki, M. Chrunik, A. Majchrowski, K. M. Kosyl, D. Kasprowicz
Summary: An efficient near-infrared quantum cutting process was achieved in Bi3TeBO9:Nd3+ phosphors through cooperative down-conversion of Bi3+ and Nd3+ ions. The near-infrared emission of Nd3+ ions was enhanced by Bi3+ ions in the microcrystalline powders doped with various concentrations of Nd3+ ions. The luminescent properties of the powders were studied, and the mechanisms of energy relaxation were discussed.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
M. Kowalczyk, M. Kaczkan, A. Majchrowski, M. Malinowski
Summary: The study compared the optical excitation and emission spectra of trivalent europium (Eu3+) ions in Bi2ZnOB2O6 in both crystal and glass phases, finding strong orange-red emissions in both phases. The results suggest that Eu3+:BZBO has the potential to be a promising emitter of orange-red luminescence in both crystal and glass phases.
Article
Chemistry, Physical
M. A. Carpenter, E. K. H. Salje, M. B. Costa, A. Majchrowski, K. Roleder
Summary: The study analyzed the order parameter coupling associated with the first order, improper ferroelastic transition in PbZrO3, showing that the coupling between two order parameters via common strains may contain contributions from higher order terms. The elastic and anelastic properties of the material change as the transition point is approached, exhibiting softening, discontinuous stiffening, and further stiffening in the stability field of the orthorhombic structure. Additionally, the absence of softening due to certain terms implies a slow relaxation time for changes in the order parameters in response to induced shear strain.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
A. Brenier, A. Majchrowski, E. Michalski
Summary: The study investigated the optical phenomena in biaxial crystals using a polarimetric method and an interferential conoscope, showing that optical activity in crystals changes the phase difference, involving the influence of orbital angular momentum.
Article
Chemistry, Multidisciplinary
Jaroslaw Kaluzny, Aleksandra Swietlicka, Lukasz Wojciechowski, Slawomir Boncel, Grzegorz Kinal, Tomasz Runka, Marek Nowicki, Oleksandr Stepanenko, Bartosz Gapinski, Joanna Lesniewicz, Paulina Blaszkiewicz, Krzysztof Kempa
Summary: This paper confirms the fascinating tribological phenomenon of carbon nanotubes (CNTs) observed at the nanoscale through macroscale experiments and investigates the influence of CNT structure on the lubricity of various polymers. It proposes the use of machine learning techniques combined with molecular and supramolecular recognition to design superlubricants.
Article
Chemistry, Physical
Dariusz Kajewski, Irena Jankowska-Sumara, Jae-Hyeon Ko, Jeong Woo Lee, Syed Furqan Ul Hassan Naqvi, Rafal Sitko, Andrzej Majchrowski, Krystian Roleder
Summary: Lead zirconate (PbZrO3) has been a topic of research for many years, with its antiferroelectric properties being questioned recently. It has been found that PbZrO3 doped with Nb exhibits complex domain structures in phases below the Curie temperature (T-C). One of these phases self-organizes at a constant temperature and transforms into a lower phase after several minutes. This isothermal transition was investigated through various measurements, including dielectric, pyroelectric current, and Raman scattering. Discontinuities in permittivity and pyroelectric current were observed, and Raman spectra confirmed the link between these discontinuities and the isothermal transition between two intermediate phases. The ordering process in the lead sublattice, stimulated by thermal fluctuations, is believed to be the driving force behind this peculiar phenomenon.
Article
Optics
Wioletta Dewo, Vitaliy Gorbenko, Anton Markovskyi, Yuriy Zorenko, Tomasz Runka
Summary: In this study, Mn2+ and Mn2+,Ce3+ doped single crystalline films of Tb3Al5O12 (TbAG) garnet were grown on Y3Al5O12 substrates using a liquid-phase epitaxy method. The performance of these films as photoluminescence converters in white light emitting diodes was investigated. The photoconversion properties of the doped TbAG films were studied in relation to film thickness and activator content. High spatial resolution luminescence spectra measurements and Raman spectroscopy studies were conducted to assess the electronic transitions and vibrational bands in the films and substrate.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Multidisciplinary
Federica Solano, Pascale Auban-Senzier, Iwona Olejniczak, Boleslaw Barszcz, Tomasz Runka, Pere Alemany, Enric Canadell, Narcis Avarvari, Nicolas Zigon
Summary: This article reports the use of sulfur-enriched ligands in coordination polymers, which exhibit enhanced conductivity upon chemical oxidation with various transition metals. The oxidation process was confirmed by X-ray diffraction experiment, and the conductivity and electronic properties were analyzed using spectroscopy measurements and calculations.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Optics
T. Zhezhera, P. Gluchowski, M. Nowicki, M. Chrunik, A. Majchrowski, D. Kasprowicz
Summary: Enhanced near-infrared emission at 1531 nm of Er3+ ions excited by Bi3+ and/or Yb3+ ions was observed in Bi3TeBO9:Yb3+/Er3+ phosphors. The synthesis of microcrystalline powders of Bi3TeBO9:Er3+, Bi3TeBO9:Yb3+, and Bi3TeBO9:Yb3+/Er3+ by means of the modified Pechini method was confirmed by XRD measurements. The low phonon energy of the Bi3TeBO9 matrix was revealed by mu-Raman investigations. Energy transfer from Bi3+ ions or Yb3+ ions to Er3+ ions resulted in the enhanced emission at 1531 nm in the Bi3TeBO9:Yb3+/Er3+ system. The potential use of Bi3TeBO9:Yb3+/Er3+ powders as spectral converters in photovoltaic devices was indicated by the results.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Marcin Kowalczyk, Marcin Kaczkan, Andrzej Majchrowski, Michal Malinowski
Summary: The spectroscopic properties of Eu3+-doped Bi12SiO20 (BSO) were studied and compared with Eu3+-doped Bi12GeO20 (BGO). Luminescence was observed due to the excitation of Eu3+ at the D-5(0) and D-5(1) levels. The Judd-Ofelt theory was used to calculate radiative lifetimes, omega parameters, and other transition probabilities. The strongest luminescence observed was attributed to the D-5(0) -> F-7(0) transition at 578 nm, similar to BGO sillenite.
Article
Materials Science, Multidisciplinary
K. Roleder, G. Catalan, A. M. Glazer, J. S. Baker, J. -H. Ko, F. H. Naqvi, S. B. Junaid, A. Majchrowski, Z. Trybula, J. Zareba, I. Lazar, D. Kajewski, J. Koperski, A. Soszynski
Summary: We have discovered a low-temperature polar phase in PbZrO3 below 270 K. The temperature dependence of polarization was determined by measuring pyroelectric current changes after poling the single crystal or ceramic in a DC electric field. This phenomenon was observed in both single crystals and ceramics, which may be related to the presence of polar (ferrielectric) antiphase boundaries within the antiferroelectric phase. The transition point was confirmed by changes in domain structure and anomalies in dielectric permittivity and losses in naturally grown single crystals and ceramic samples.
Article
Chemistry, Physical
Iwona Lazar, Roger William Whatmore, Andrzej Majchrowski, Anthony Mike Glazer, Dariusz Kajewski, Janusz Koperski, Andrzej Soszynski, Julita Piecha, Barbara Loska, Krystian Roleder
Summary: Intensive investigations have revealed the strong correlation between the piezoelectric properties of PbZr1-xTixO3 (PZT) materials and their ABO(3) perovskite structure, especially at the Morphotropic Phase Boundary (MPB). Undoped PZT single crystals with low Ti content exhibit similar piezoelectric properties to doped PZT ceramics, with a tricritical point observed near x ~ 0.06. These findings provide important insights into the performance of PZT materials.
Article
Materials Science, Multidisciplinary
Krystian Roleder, Andrzej Majchrowski, Iwona Lazar, Roger W. Whatmore, A. Mike Glazer, Dariusz Kajewski, Janusz Koperski, Andrzej Soszynski
Summary: The origin of the strong piezoelectric phenomenon in PZT perovskites is still not fully understood. Studies have shown that the enhancement of the piezoelectric properties in this material is related to a change in the distribution of domains with monoclinic symmetry, which are easily polarized and rotated under the action of an electric field.
Article
Materials Science, Multidisciplinary
Maria A. Kniazeva, Alexander E. Ganzha, Irena Jankowska-Sumara, Marek Pasciak, Andrzej Majchrowski, Alexey Filimonov, Andrey Rudskoy, Krystian Roleder, Roman G. Burkovsky
Summary: The Perovskite solid solutions PbHfO3-PbSnO3 were studied to understand the formation mechanisms of incommensurate phases. The study used x-ray diffuse scattering signal to quantify the evolution of susceptibilities related to different distortion modes. The experimental results showed a linear dependence of ferroelectric stiffness in the cubic phase and a shift in the susceptibility maximum to a nonzero wave vector in the intermediate phase.
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
