Article
Chemistry, Physical
Bhagyashree Mohanty, S. Bhattacharjee, S. N. Sarangi, N. C. Nayak, R. K. Parida, B. N. Parida
Summary: In this study, a single-phase material 50BLFO-50BST was successfully synthesized with good crystallinity and optical properties. The investigations of dielectric, impedance, and modulus properties suggest the material has potential electromagnetic characteristics. The material is identified as a promising candidate for magnetic storage devices based on the room temperature ferromagnetic parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Zakaria Chchiyai, Fatima El Bachraoui, Youssef Tamraoui, El Mehdi Haily, Lahcen Bih, Abdelilah Lahmar, Jones Alami, Bouchaib Manoun
Summary: In this study, ceramics with perovskite structure of compositions Ba1-xBixTi1-xFexO3 were synthesized and characterized using various techniques. The increase of BiFeO3 content led to two phase transitions, UV-vis absorption spectra revealed electronic transitions, and impedance results suggested the contribution of grain boundary to total conductivity.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Erman Eloge Nzaba Madila, Steeve Rousselot, Maxime Rioux, Mickael Dolle, Adam Duong
Summary: New compounds Na2Co6Mn2(PO4)(6) and Na2Co6Ni2(PO4)(6) with monoclinic structures were successfully synthesized by solid-state method. The particles have homogeneous compositions and their band gap energies were determined to be 1.78 eV and 1.86 eV, respectively. Both compounds exhibit acceptable ionic conductivity.
SOLID STATE SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Randeep Kaur, Anumeet Kaur
Summary: A solid state reaction technique was used to synthesize a series of solid solution materials, and their structures were analyzed using X-ray diffraction and Raman spectroscopy. The experimental results showed that these samples all exhibited ferroelectric and magnetic characteristics at room temperature, with specific phase transition temperatures. The impedance and modulus analysis revealed the contributions of bulk and grain boundaries in the samples, and conductivity relaxation was observed in all samples.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Bhagyashree Mohanty, S. Bhattacharjee, N. C. Nayak, R. K. Parida, B. N. Parida
Summary: Investigation of a composite material with magnetostriction and piezoelectric behavior shows promising characteristics for practical device applications, with moderate Curie temperature, high resistivity, and ferromagnetic properties.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Physical
Dingwei Hou, Huiqing Fan, Yanqin Chen, Yuxin Jia, Weijia Wang
Summary: This study investigates the influence of ions with different radii on the performance of high temperature piezoelectric ceramics. Bi-2.99(Li(0.5)Ln(0.5))(0.01)TiNbO9 (BTNO-1LiLn) ceramics were prepared and their microstructure, piezoelectric properties, and electrical conductivity were studied. It was found that the Curie temperature of BTNO-1LiLn increases with decreasing radii of Ln(3+) ions. BTNO-1LiEr exhibited the highest piezoelectric coefficient. Crystal structure analysis and band structure calculations provided insights into the origin and characteristics of BTNO based ceramics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Bhagyashree Mohanty, Nimai C. Nayak, B. N. Parida, R. K. Parida
Summary: The lead-free polycrystalline compound 0.5(NdFeO3)-0.5(Ba0.5Sr0.5TiO3) (NFO-BST) was successfully prepared through conventional solid-state reaction route. The compound exhibited a tetragonal structure with a lattice parameter of a = b = 3.99(4) Å, and c = 4.017(2) Å, confirmed by X-ray Diffraction (XRD) and Rietveld Refinement. The sample showed a dielectric constant of 408.32 at 100 Hz frequency at room temperature, making it suitable for microwave absorbers. The compound also displayed ferroelectric and ferromagnetic properties, indicating potential applications in multiferroic devices.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Fatih Erdem Bastan, Muhammad Atiq Ur Rehman, Fatih Ustel
Summary: The substitution of Sr in hydroxyapatite alters its lattice structure and thermal properties, reducing thermal stability and increasing crystal volume.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Anju Kumari, Kavita Kumari, Faheem Ahmed, Adil Alshoaibi, P. A. Alvi, Saurabh Dalela, Mohamad M. Ahmad, Rezq Naji Aljawfi, Piyush Dua, Ankush Vij, Shalendra Kumar
Summary: In this study, the properties of Sm-doped BaTiO3 ceramics were investigated, revealing enhanced spontaneous polarization, high dielectric constant, and semiconductor nature for the Sm-BTO samples, which can be utilized in visible range photon harvesting devices. The magnetic measurements also suggested ferromagnetic ordering at room temperature. Overall, the findings indicate that the properties of BTO ferroelectric ceramic can be modulated through Sm doping.
Article
Optics
Seiya Shimono, Koki Yoshimoto, Yuta Ueda, Yasushi Nanai, Hiroaki Kishimura, Atsushi Aruga
Summary: The study on Eu2+ substituted pollucite phosphors revealed that the emission spectra color shifts from bright blue to bright blue-green with increasing Eu2+ substitution. This tunable luminescence color is attributed to the crystal field splitting effect of Eu2+ ions and vacancies at Cs sites caused by the substitution.
JOURNAL OF LUMINESCENCE
(2021)
Article
Materials Science, Ceramics
Ao Zhang, Huiqing Fan, Dingwei Hou, Xin Meng, Weijia Wang
Summary: CSTANx microwave dielectric ceramics were synthesized through solid-state reaction, and the effects of (Al0.5Nb0.5)4+ co-doping on the microstructure and dielectric behavior were investigated. The results show that (Al0.5Nb0.5)4+ doping enhanced the ordering at B-site and reduced the dielectric loss, resulting in improved temperature stability of relative permittivity and resonant frequency.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Junwu Yu, Yan Wang, Zhaoqin Dai, Faming Yang, Alireza Fallahpour, Bahman Nasiri-Tabrizi
Summary: Both experimental and modeling approaches were employed to examine the solid-state formation mechanisms and structural behavior of nanosized substituted hydroxyapatite powders, using different machine learning techniques such as artificial neural networks and genetic programming. The results showed that the modeling framework was effective in estimating structural features of HA-based bioceramics, with different models providing accurate predictions. The statistical assessments indicated good performance of the models in predicting crystallite size, with low Mean Squared Error values and high Correlation Coefficients.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Biswajit Samanta, P. Anand Kumar
Summary: The solid-state phase transformations, phase stability, and defect structure in the Cr-Zr system were investigated experimentally. The results provide accurate measurements of transition temperatures and the liquidus temperature range of alloys. XRD analysis reveals the lattice parameters and phase fractions of the alloys.
Article
Materials Science, Multidisciplinary
S. K. Ahmed, M. Faishal Mahmood, M. Arifuzzaman, M. Belal Hossen
Summary: Nanoparticles of Cu-Zn-Al-Fe oxides were synthesized using the auto-combusted sol-gel process and the effect of Al3+ substitution on structural, magnetic, and dielectric properties was studied. The addition of Al3+ resulted in increased grain and grain boundary resistance, reducing space charge polarization. Electrical conductivity increased with frequency and saturation magnetization showed an increment with nonmagnetic Al3+ substitution.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Shilpa Kumari, Radheshyam Rai, Pawan Kumar, O. P. Thakur, Ratnamala Chatterjee
Summary: The structural and electrical properties of Pr1-xEuxMnO3 manganites were investigated in this study, revealing a mixed-phase nature and decreasing unit cell volume with increased Eu content. The presence of oxygen vacancies was indicated by low activation energy values, and the grain boundary effect was found to diminish with increasing temperature, attributed to the development of oxygen vacancies during sintering. These defects influenced the impedance at the barrier of the grain and grain boundary interface.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Ceramics
Xu Li, Xiaoyan Dong, Fei Wang, Zhi Tan, Qiming Zhang, Hao Chen, Jingwen Xi, Jie Xing, Huanfu Zhou, Jianguo Zhu
Summary: In this study, the enhancement of energy storage properties in lead-free relaxor ferroelectrics was achieved through component regulation. The materials exhibited high recoverable energy storage density, large energy storage efficiency, and a wide operating temperature range. The excellent energy storage properties were mainly attributed to the suppression of early polarization saturation and the improvement of dielectric breakdown strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Zhi Tan, Jingwen Xi, Jie Xing, Bo Wu, Qiming Zhang, Qiang Chen, Jianguo Zhu
Summary: This study presents a systematic orientational average method using first-principle calculations to estimate the piezoelectric properties of polycrystalline ferroelectric materials. The method bridges the gap between single crystal and polycrystal ferroelectric materials and contributes to the further study of piezoelectric polycrystals. The piezoelectric properties of bismuth layer-structured ferroelectrics (BLSFs) are investigated using this method, revealing the importance of polarization stretching and slipping in BLSFs' piezoelectricity.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Xu Li, Zhi Tan, Jie Xing, Fei Wang, Lixu Xie, Wen Zhang, Ning Chen, Hao Chen, Jianguo Zhu
Summary: By employing a multiscale regulation strategy, this research successfully addresses the issues of early polarization saturation and low breakdown electric field in (Na0.5Bi0.5)(0.7)Sr0.3TiO3-based energy storage materials, resulting in excellent comprehensive performances.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Jie Yin, Xiaoming Shi, Hong Tao, Zhi Tan, Xiang Lv, Xiangdong Ding, Jun Sun, Yang Zhang, Xingmin Zhang, Kui Yao, Jianguo Zhu, Houbing Huang, Haijun Wu, Shujun Zhang, Jiagang Wu
Summary: This study investigates the atomic-scale structure of lead-free relaxor ferroelectric Bi0.5Na0.5TiO3-based system and its relationship to the polar structure evolution and large dynamic electromechanical response. It is found that increased defect concentration is the main driving force for deviating polarizations with high-angle walls, while the driving force for deviating polarizations with low-angle walls changes. The competitive and synergetic equilibrium of anisotropic field versus random field contributes to the giant electromechanical response.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Xiaoyan Dong, Xu Li, Xiuli Chen, Zhi Tan, Jiagang Wu, Jianguo Zhu, Huanfu Zhou
Summary: This study demonstrates the effectiveness of xBNST ceramics with a core-shell structure in improving the breakdown strength, and reveals the intrinsic mechanism for enhancing the breakdown strength via phase-field simulations and first-principles calculations based on density functional theory. The ceramics exhibit comprehensive energy storage performances, providing a feasible way to develop high-performance capacitors for advanced energy storage materials and applications.
Article
Nanoscience & Nanotechnology
Yunting Cheng, Wenchou Fan, Hao Chen, Lixu Xie, Jie Xing, Zhi Tan, Jianguo Zhu
Summary: Potassium sodium niobate (KNN) ceramics are the most promising lead-free piezoelectric ceramics to replace lead zirconate titanate (PZT) ceramics. They have been widely studied for their application prospects in various electronic devices. The aim is to increase Qm while maintaining high piezoelectric activity in ultrasonic devices. The study shows that a KNN-based ceramic with high d33 and Qm can be prepared using a conventional solid-state technique. The formation of defect dipoles helps stabilize the ferroelectric order and hinder polarization rotation.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Hongjiang Li, Lixu Xie, Zhi Tan, Jie Xing, Xu Li, Hao Chen, Fei Wang, Manjing Tang, Jianguo Zhu, Yuan Cheng
Summary: This study suggests a simple approach to achieve excellent piezoelectric performances in potassium sodium niobate (KNN)-based ceramics by optimizing the content of nonstoichiometric Nb5+. Excessive Nb5+ significantly influences the microstructural features and electrical properties of the ceramics, improving their temperature stability. The results show that a high Curie temperature (TC), large electromechanical coupling factor (kp), and high piezoelectric constant (d33) can be simultaneously obtained in the KNN-based ceramics with nonstoichiometric Nb5+.
INORGANIC CHEMISTRY
(2022)
Article
Physics, Applied
Shangyi Guan, Xiaojun Wu, Wei Shi, Yutong Wu, Hongfei Xu, Rong Lang, Yu Chen, Zhi Tan, Jie Xing, Jianguo Zhu, Qiang Chen
Summary: A new type of Aurivillius ferroelectric material (Na0.5Bi0.5)(0.5-x/2)(Li0.5Ce0.5)(x/2)Bi2.5Ti0.5Nb1.5O9 was designed to achieve simultaneous large piezoelectric response and high Curie temperature, by combining the advantages of new-type solid solutions and A-site doping strategy. This material exhibits a large piezoelectric coefficient and high Curie temperature, with good electrical resistivity at high temperatures.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Qifan Chen, Tingting Gao, Rong Lang, Zhi Tan, Jie Xing, Jianguo Zhu
Summary: By doping Bi(Zn2/3Ta1/3)O3 and NaNbO3 in KNN ceramics, materials with high energy storage density and excellent temperature stability are obtained, making them potential lead-free ceramic capacitor materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Ning Chen, Fei Wang, Xu Li, Xinji Yang, Hao Chen, Zhi Tan, Jie Xing, Jianguo Zhu
Summary: A new solid-solution ceramic LC-CBTa-xCBN is fabricated by introducing CBN into CBTa, which demonstrates optimal electrical performance.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Zhi Tan, Hui Zhang, Xiaojun Wu, Jie Xing, Qiming Zhang, Jianguo Zhu
Summary: In this study, the potential for high piezoelectricity in the nonperovskite carbon-boron clathrate ScB3C3 is demonstrated using first-principles calculations. The highly symmetric B-C cage with mobilizable Sc atom constructs a flat potential valley, allowing for easy, continuous, and strong polarization rotation. By manipulating the cell parameter b, the potential energy surface can be flattened to produce an extra-high shear piezoelectric constant d15 of 9424 pC/N. The significance of large polarization and high symmetric polyhedron structure is shown, providing universal physical principles for the search of new high-performance piezoelectrics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Hongjiang Li, Hao Chen, Xu Li, Jie Xing, Wenbin Liu, Zhi Tan, Mingyue Mo, Ning Chen, Manjing Tang, Jianguo Zhu
Summary: A composite material composed of 0.957(K0.48Na0.52)Nb0.94Ta0.06O3-0.04(Bi0.5Na0.5)ZrO3-0.003BiFeO3 (KNNT-BNZ-BFO) matrix and K4CuNb8O23 (KCN) phase was developed using a two-step ball-milling method. The composite material exhibited a high mechanical quality factor (Q(m)) and a decrease in remnant polarization and dielectric constant, as well as an increase in resistivity. This hardening effect can be attributed to the mechanical clamping effect and domain wall pegging at the KNNT-BNZ-BFO/KCN interface.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Yuan Cheng, Yutong Wu, Mingyue Mo, Xu Li, Lixu Xie, Hao Chen, Jie Xing, Zhi Tan, Jianguo Zhu
Summary: In this study, a simple method is presented to broaden the sintering temperature range of KNN-based ceramics by adding appropriate sintering aid Fe2O3, which decreases the sintering temperature sensitivity. The prepared ceramics exhibit a much wider sintering temperature range (-100 degrees C) compared to previous KNN-based ceramics (20-30 degrees C). The ceramics sintered at Ts = 1040 degrees C achieve optimal properties (d33 = 370 pC/N, d3*3 = 447 pm/V, kp = 0.47, TC = 323 degrees C). Impedance characterization shows the origin of enhanced electric and sintering properties is defect-dependent grain growth mechanism. This work provides a feasible and effective method for widening the sintering temperature and obtaining high piezoelectricity in KNN-based material system at the same time.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Jingwen Xi, Hao Chen, Xin Peng, Hongyan Wan, Yihan Lin, Zhi Tan, Jie Xing, Qiang Chen, Jianguo Zhu, Zuo-Guang Ye
Summary: Li/Bi co-substitution enhances the initial polarization and dielectric breakdown strength (BDS) of CaBi4Ti4O15 ceramics, improving their piezoelectricity. Experimental work, first-principles calculations, and finite element simulation are employed to investigate the effect of Li/Bi co-substitution. Stronger spontaneous polarization from lattice distortion and improved grain growth contribute to enhanced initial polarization. Furthermore, changed grain-scale microstructure improves hardness, inhibits local discharge, and higher resistivity suppresses heat generation during the poling process, resulting in a 100% increase in BDS. This work demonstrates an effective strategy for developing enhanced bismuth layer-structured ferroelectrics with improved piezoelectricity for high-temperature applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Xu Li, Jie Xing, Fei Wang, Ning Chen, Hao Chen, Qiang Chen, Zhi Tan, Huanfu Zhou, Jianguo Zhu
Summary: This study demonstrates that by optimizing the composition and fine grain size, dielectric materials with excellent comprehensive energy storage performances can be obtained. The research provides a feasible approach for designing high-performance materials and reveals the mechanisms behind delayed polarization saturation and high breakdown strength.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
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)
