Article
Materials Science, Ceramics
Xuefei Wang, Yuxin Fan, Guoqiang Luo, Rong Tu, Qiang Shen, Lianmeng Zhang
Summary: With the increasing application rate of multilayer ceramic capacitors (MLCCs) in small electronic devices, there is a need for the use of barium titanate (BaTiO3) raw material with small particle size and excellent dielectric properties. In this study, small cubic phase Y-doped BaTiO3 (BYT) nanoparticles were prepared using a hydrothermal method, and highly dielectric tetragonal phase BYT ceramics were prepared based on this method. The results demonstrate that the 50 nm cubic phase BaTiO3 powder can meet the needs of next-generation high-capacity MLCCs, providing a reference for small cubic phase BaTiO3 as a dielectric material for high-capacity MLCCs.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Md Kashif Shamim, Anand Ranjan, Santosh Kumar, Shekhar Kumar, Seema Sharma
Summary: Lead-free polycrystalline 0.75 BiFe 1-xMn xO3-0.25BaTiO3 (x = 0.00, 0.01, 0.02 and 0.03) ceramics were synthesized via high temperature solid state reaction technique. Mn doping was found to affect the structure, ferroelectric and magnetic behavior of the BF-BT ceramics. The study revealed that the crystal structure remained unchanged with increasing Mn concentration. The average crystallite size increased with Mn concentration. The ferroelectric polarization decreased, while leakage current density increased with increasing Mn concentration. The presence of multivalence states of Fe/Mn/Ti resulted in lattice distortion and significantly affected the magnetic behavior of the ceramics.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Ritesh Verma, Ankush Chauhan, Khalid Mujasam Batoo, Muhammad Hadi, Emad H. Raslan, Rajesh Kumar, Muhammad Farzik Ijaz, Abdulaziz K. Assaifan
Summary: The synthesis of vanadium-doped BCZT ceramic oxides was reported in this paper, confirming the existence of a solubility limit of V in BCZT ceramics. Analysis revealed the influence of crystal structure and formation of oxygen vacancies on the luminescence and electrical properties of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Khalid Mujasam Batoo, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Muhammad Hadi, Omar M. Aldossary, Y. Al-Douri
Summary: This study reported the synthesis of Gd and Nb co-doped BT ceramic oxides and investigated their structural and electrical properties. Various analysis techniques were used to characterize the samples, revealing the influence of Gd and Nb doping on the electrical properties of the ceramic materials, which were found to improve with increasing dopant concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jing Shi, Rizhuang Dong, Jiayi He, Daowei Wu, Wenchao Tian, Xiao Liu
Summary: This study investigated the structural, dielectric, and ferroelectric properties of lead-free ceramics based on the ternary system of BaTiO3 (BT). It was observed that the dopant concentration influenced the structural evolution from tetragonal to pseudocubic phase. The dielectric response showed diffusive peaks and relaxor behavior, indicating a transition from ferroelectric to relaxor state. The ceramics exhibited slim polarization hysteresis loops and electrical inhomogeneities caused by excessive dopant addition, leading to degraded electric breakdown strength. The oxygen vacancy hopping mechanism was proposed to explain the diffuse dielectric response at high dopant concentrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Wei Ziqin, Xia Xiang, Li Qin, Li Guorong, Chang Jiang
Summary: Developing a composite bioactive piezoelectric material that can generate electrical signals and induce mineralization and deposition is of great significance. In this study, barium titanate and calcium silicate were used to prepare a barium titanate/calcium silicate composite ceramic, which showed both piezoelectric properties and the ability to induce mineralization. This provides a new choice for bone repair materials.
JOURNAL OF INORGANIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xiaoqin Ke, Zhengkai Hong, Qianqian Ma, Xin Wen, Zhiguo Wang, Sen Yang, Lixue Zhang, Dong Wang, Longlong Shu, Qian Deng, Shengping Shen, Xiaobing Ren, Yunzhi Wang
Summary: Flexoelectric materials, such as ferroelectrics, have the potential to be used in actuators and sensors due to their ability to generate polarization in response to a strain gradient. However, the flexoelectric coefficients of most dielectrics are too small for practical use. In this study, we demonstrate that by doping BaTiO3 with BaZrO3, the flexoelectric coefficient can be significantly enhanced through tuning the first-order paraelectric-ferroelectric phase transition, providing a general design method for achieving high flexoelectric coefficients in a wide range of ferroelectric systems.
Article
Materials Science, Multidisciplinary
Jianwei Zhao, Stephen D. Funni, Emily R. Molina, Elizabeth C. Dickey, Jacob L. Jones
Summary: Under the application of an external voltage, high electric field concentrations develop around the interdigitated electrode edges inside multilayer ceramic actuators (MLCAs). The local inhomogeneity in the electromechanical response is caused by the spatial distribution of the local electrical field. By utilizing synchrotron-based high-energy X-ray diffraction (XRD), the structural changes in partially electroded Nb-doped PbZrxTi1-xO3 samples as a function of applied electric field were investigated. The results show that the domain switching behavior and phase transitions are spatially dependent across the inactive regions in partially electroded samples, especially near the electrode edge and the tetragonal composition near the morphotropic phase boundary (MPB).
Article
Chemistry, Analytical
Dongcai Zhang, Yaodong Yang, Wei-Feng Rao
Summary: Digital light processing (DLP) technology is a promising 3D printing technology for efficient manufacturing of complex ceramic devices. This paper optimizes the printing process and validates the use of the device as a force sensor and magnetic sensor.
Article
Engineering, Environmental
Yang Li, Yi Liu, Mingyang Tang, Jingwen Lv, Fukang Chen, Quan Li, Yan Yan, Fei Wu, Li Jin, Gang Liu
Summary: A two-step strategy has been proposed in this study to enhance the energy storing performance of lead-free ferroelectric ceramics, which includes adjusting the ratio of chemical elements and optimizing the preparation process, and has been proven to significantly improve the energy storage performance, especially achieving superhigh energy storage density for a new ceramic material under high electric field.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Chen Zhang, Zixin Zhou, Zhuming Tang, Didier Ballo, Chun Wang, Gang Jian
Summary: The Sc2O3 doped Ba(Zr0.1Ti0.9)O-3 ferroelectric ceramics were investigated for their microstructure, domain structure, dielectric and ferroelectric properties. It was found that Sc2O3 doping decreased the grain size, while both 90 degrees and 180 degrees ferroelectric domains coexisted in the ceramics. The phase transition temperature and dielectric permittivity maximum decreased with increasing Sc2O3 content, but the relative dielectric constant temperature stability was improved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Multidisciplinary
Ankur Sood, Margaux Desseigne, Atul Dev, Lionel Maurizi, Anuj Kumar, Nadine Millot, Sung Soo Han
Summary: Stimulating cells with electrical cues is an important method to interact with biological systems, and it has been widely used in clinical practices for various pathological ailments. Among the piezoelectric materials, colloidal perovskite barium titanate (BaTiO3) has gained substantial interest due to its high dielectric constant, excellent ferroelectric properties, and acceptable biocompatibility. BaTiO3 nanoparticles (BaTiO3 NPs) have shown great potential in biomedical applications and wearable bioelectronics, making them a promising platform for personal healthcare. This review discusses the nanostructured piezoelectric bio interface of BaTiO3 NPs in applications such as drug delivery, tissue engineering, bioimaging, bioelectronics, and wearable devices, with emphasis on the fabrication methods and surface modifications of BaTiO3 NPs. It highlights the utility of BaTiO3 NPs as active devices and their potential in the field of nanomedicine for biomedical applications.
Article
Materials Science, Ceramics
Sushrisangita Sahoo, Abhinav Yadav, K. P. Andryushin, P. K. Mahapatra, R. N. P. Choudhary
Summary: The (Gd1-xBax)(Fe1-xTix)O-3 ceramics with different compositions (x = 0.0-0.4) were systematically investigated for their structural transformation, ferro-paraelectric and magnetic ordering induced dielectric phase transitions, multiferroic properties, relaxation and conduction mechanisms. The chemical route was used for material synthesis. Rietveld refinement revealed a structural transformation from orthorhombic to mixed phase for x > 0.2. The analysis of FESEM micrographs indicated a decrease in grain size with the increase in BT in the composition. Dielectric anomalies were explained based on ferroelectric-paraelectric phase transition, polarization induced by a spin reorientation, and antiferromagnetic ordering. The multiferroic properties were studied through various plots. The compositions x = 0.1-0.3 showed improved magnetic properties, making them suitable for spintronic devices. The composition x = 0.3 exhibited a maximum magneto-electric coupling coefficient of 4.77 mV/cm.Oe, making it suitable for magnetoelectric coupling devices.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Agata Lisinska-Czekaj, Dionizy Czekaj
Summary: This paper presents the results of X-ray photoelectron studies and X-ray diffraction analysis on electroceramic thin films deposited on stainless-steel substrates. The layer-type structure of the thin films, prepared using the sol-gel method, maintained a perovskite-type phase after thermal treatment.
Article
Chemistry, Physical
Damien Brault, Thomas Richardot, Philippe Boy, Philippe Belleville, Franck Levassort, Maxime Bavencoffe, Bijun Fang
Summary: Lead-based materials are widely used in piezoceramics due to their high electromechanical properties. However, due to environmental concerns, the use of lead in electronic devices is restricted. Therefore, this study focuses on the development of lead-free ceramics for piezoelectric-based devices. A new sol-gel method was used to synthesize doped barium titanate, which resulted in ceramics with good electromechanical properties. These findings provide a potential method for the processing of lead-free piezoelectric thick films.
Article
Materials Science, Multidisciplinary
Irena Jankowska-Sumara, Przemyslaw Gwizd, Andrzej Majchrowski, Andrzej Soszynski
MATERIALS CHEMISTRY AND PHYSICS
(2020)
Article
Physics, Applied
Irena Jankowska-Sumara, Ewa Markiewicz, Andrzej Majchrowski, Andrzej Soszynski, Maria Podgorna
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Spectroscopy
Katarzyna Pytlakowska, Karina Kocot, Barbara Hachula, Michal Pilch, Roman Wrzalik, Maciej Zubko
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2020)
Article
Physics, Condensed Matter
I Jankowska-Sumara, M. Pasciak, M. Kadziolka-Gawel, M. Podgorna, A. Majchrowski, K. Roleder
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Chemistry, Physical
Irena Jankowska-Sumara, Mariola Kadziolka-Gawel, Maria Podgorna, Andrzej Majchrowski, Krystian Roleder
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Irena Jankowska-Sumara, Marek Pasciak, Maria Podgorna, Andrzej Majchrowski, Milos Kopecky, Jiri Kub
Summary: Pb(Zr1-xSnx)O-3 single crystals were characterized using x-ray diffraction to study the structure of two intermediate phases between antiferroelectric and paraelectric phases. The lower-temperature intermediate phase is characterized by incommensurate displacive modulations in the Pb sublattice, while the higher temperature intermediate phase is characterized by distortions of the oxygen sublattice primarily in the form of anti-phase tilts of the oxygen octahedra. Additionally, structured diffuse scattering was observed in the paraelectric phase along Γ-M and M-R lines indicating high-temperature correlated disorder of Pb ions and octahedral rotations.
Article
Crystallography
Przemyslaw Gwizd, Dorota Sitko, Irena Jankowska-Sumara, Magdalena Krupska-Klimczak
Summary: The electrocaloric effect (ECE) in BaTiO3 ceramics, both pure and doped with Eu3+ ions, was investigated. Positive ECE was observed around the phase transition point, while abnormal negative ECE was detected in the doped ceramics above the phase transition temperature, possibly due to defects from fixed local polarization of defect dipoles.
Article
Chemistry, Physical
Krzysztof Ziewiec, Miroslawa Wojciechowska, Irena Jankowska-Sumara, Aneta Ziewiec, Slawomir Kac
Summary: This work investigated the microstructure, phase composition, mechanical properties, and thermal stability of a two-component melt-spun Ni55Fe20Cu5P10B10 alloy. The results showed differences in properties compared to traditionally produced melt-spun alloys of similar composition. Properties in this composite are inherited from the amorphous state of precursor alloys used in two-component melt spinning processing.
Article
Materials Science, Ceramics
Irena Jankowska-Sumara, Jae-Hyeon Ko, Andrzej Majchrowski
Summary: Pb(Hf1-xSnx)O-3 single crystals with x = 0.08 were characterized using single-crystal X-ray diffraction and Raman scattering. Information about the structure of two intermediate phases and the optical phonons in the crystals were obtained. The study also revealed the control of soft modes on phase transitions in antiferroelectric phases.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
A. O. Diachenko, M. P. Trubitsyn, M. D. Volnianskii, I. Jankowska-Sumara, Ye. V. Skrypnik, M. M. Koptiev
Summary: The lithium-sodium tetragermanate glass LiNaGe4O9 was prepared by fast quenching the melt and devitrified under the control of differential scanning calorimetry. The electrical conductivity of the glass showed a sharp increase near the glass transition temperature T-g and dropped significantly after crystallization. Charge transfer in LiNaGe4O9 glass and polycrystal was attributed to the motion of Li ions.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2021)
Article
Chemistry, Physical
Magdalena Krupska-Klimczak, Przemyslaw Gwizd, Irena Jankowska-Sumara, Dorota Sitko, Piotr Jelen
Summary: The study shows that Eu3+ doping has an impact on the structure and properties of BaTiO3 ferroelectric ceramics, including a slight decrease in Curie temperature and the appearance of new modes. Additionally, the ferroelectric properties depend on both doping and microstructure, while the electrocaloric effect changes with doping.
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
Chemistry, Physical
Jan Suchanicz, Marcin Was, Michalina Nowakowska-Malczyk, Dorota Sitko, Kamila Kluczewska-Chmielarz, Krzysztof Konieczny, Grzegorz Jaglo, Piotr Czaja, Bartosz Handke, Zofia Kucia, Patryk Zajac, Klaudia Lyszczarz
Summary: Fe- and Mn-modified Na0.5Bi0.5TiO3 ceramics were synthesized by solid-state reaction method, and their crystal structure, dielectric and thermal properties were investigated. The results showed that the addition of Fe/Mn and poling had effects on the crystal structure and properties, and some mechanisms of structural evolution and property improvement were revealed.
Article
Chemistry, Physical
Magdalena Krupska-Klimczak, Irena Jankowska-Sumara, Przemyslaw Gwizd, Marceli Koralewski, Andrzej Soszynski
Summary: In this study, the ferroelectric properties of Pb5Ge3O11 single crystals modified by Ba ions were investigated. The measurements showed that Ba doping significantly affected all the measured parameters, resulting in the lowering of Curie temperature, gradual diffusion of phase transition, and decrease in polarization values and coercive field. The overall electrocaloric effect (ECE) decreased due to the reduction in polarization. However, the expanded range of phase transition occurrence (up to 30 K) could be beneficial for applications.
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)