Article
Physics, Multidisciplinary
Zhenhua Liu, Jian Dong, Tingting Liu, Jiaxiao Wang, Xiaodong Si, Jia Lin, Yongsheng Liu
Summary: This paper investigates the magnetocaloric properties, phase transition, and critical behavior of Mn5Ge3-xZnx (x = 0.1, 0.2, and 0.3) compounds fabricated by the arc-melting method. The Curie temperature and magnetic entropy change decrease with Zn doping. The normalized curves of universal behavior demonstrate second-order transitions in the Mn5Ge3-xZnx alloys, consistent with the analysis of Landau coefficients and the Banerjee criterion. The critical behavior of this series was studied using modified Arrott plots, Kouvel-Fisher method, and critical isotherm curves to explore the properties near the phase transition.
Article
Materials Science, Multidisciplinary
M. S. Anwar, Imad Hussain, S. N. Khan, P. Fournier, Bon Heun Koo
Summary: In this paper, the critical behavior of Ba1.9Pr0.1FeMoO6 double perovskite related to magnetocaloric effect is reported. A maximum magnetic entropy change of |Delta S-M(max)| similar to 0.68 Jkg(-1)K(-1) and a relative cooling power of RCP -62 Jkg(- 1) were observed under an applied field of H = 2.5 T. The critical exponents for the second order phase transition from paramagnetic to ferromagnetic state were determined as beta = 0.45, gamma = 0.84, and delta = 2.91. These values indicate that the sample obeys mean field model and Widom scaling relation. The collapse of different isothermal magnetization data into two branches below and above TC further confirms the authenticity of the critical exponents.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Abir Hadded, Jalel Massoudi, Sirine Gharbi, Essebti Dhahri, A. Tozri, Mohamed R. Berber
Summary: This study investigates the spin dynamics, magnetocaloric effect, and critical behavior of ferrimagnetic spinel Cu1.5Mn1.5O4 near the magnetic phase transition temperature. The compound exhibits cluster-glass-like behavior at 40K and undergoes a second-order magnetic phase transition from paramagnetic to ferrimagnetic at TC = 80K. The magnetocaloric properties of Cu1.5Mn1.5O4 are influenced by electron interactions and magnetoelastic coupling, making it a promising candidate for magnetic refrigeration applications.
Article
Materials Science, Multidisciplinary
Jamila Dhahri, Ramzi Lefi, Souhir Bouzidi, Manel Essid, Fahad Abdulaziz, Amal H. Alsehli, Marwah M. Alsowayigh
Summary: In this article, we investigate the critical behavior of La0.7Ba0.2Ca0.1Mn1-xSnxO3 samples (x = 0.00 and 0.01) near the PM-FM phase transition. We determine the critical parameters through an iterative process using modified Arrott plots and confirm them using other techniques such as the Kouvel-Fisher method and critical isotherm. Our findings show that the samples undergo a second-order phase transition and the accuracy of the critical exponent parameters is demonstrated.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Ceramics
Zhuojia Xie, Zhengguang Zou, Xinyu Jiang, Weijian Zhang
Summary: The effects of K+ doping on the structure, magnetic characteristics, magnetocaloric properties, and critical behavior of LNSKMNO ceramics were investigated. The results showed that K+ doping influenced the structure and magnetic behavior of the ceramics, leading to temperature-dependent magnetic phase transition.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
R. Skini, H. Baaziz, A. Tozri, M. Abdel-Hafiez, A. Hassan
Summary: The study on La0.8K0.2MnO3 nanoparticles reveals a discrepancy in magnetic entropy maximum values due to the presence of an extrinsic effect associated with nanometric grain size. The critical exponents obtained are close to the mean-field theory, indicating long-range interaction between spins.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Souhir Bouzidi, Mohamed Hsini, Sonia Soltani, Manel Essid, M. A. Albedah, Hafedh Belmabrouk, J. Dhahri
Summary: In this study, the critical behavior and magnetocaloric effect (MCE) simulation of La0.75Ca0.1Na0.15MnO3 (LCNMO) compound at the second order ferromagnetic-paramagnetic phase transition were investigated. The optimized critical exponents, beta = 0.48 and gamma = 1, were obtained using the Kouvel-Fisher method, suggesting that the Mean Field Model (MFM) is a suitable model for analyzing the MCE in the LCNMO sample. The isothermal magnetization M(H, T) and magnetic entropy change -Delta S-M(H, T) curves were successfully simulated using the Arrott-Noakes equation of state, Landau theory, and MFM, allowing for estimation of magnetic entropy variation in a wide temperature range.
Article
Physics, Applied
Ankita Singh, Padmanabhan Balasubramanian, Mohd Anas, Rinku Kumar, P. D. Babu, C. M. N. Kumar, Wojciech Tabis, V. K. Malik
Summary: The study on polycrystalline NdFe0.5Mn0.5O3 revealed complex magnetothermal properties, including peak magnetic entropy change at specific temperatures and magnetic fields, as well as distinctive features of magnetic heat capacity at different temperatures.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Xiaojun Yang, Junxiao Pan, Shijiang Liu, Xiangyu He, Mao Yang
Summary: Systematic investigations were performed on the magnetic properties of Yb14MnSb11, a ferromagnetic Kondo lattice compound in the underscreened limit with high thermoelectric efficiency. The localized nature of the ferromagnetism in Yb14MnSb11 was confirmed by the Rhode-Wohlfarth ratio (RWR) of 1.01 and the predicted Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction. Detailed analyses revealed a second-order ferromagnetic phase transition with three-dimensional critical behavior. Additionally, magnetocaloric effect and cooling power were calculated to be 0.772 J kg-1 K-1 and 16.43 J kg-1 at 5 T, respectively.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Multidisciplinary Sciences
M. A. Islam, A. K. M. Akther Hossain
Summary: The magnetic properties, magnetocaloric effect, and critical analysis of non-stoichiometric Co1+xCrxFe2-xO4 (x = 0.125, 0.250, 0.375, and 0.500) were studied. The synthesized samples showed single-domain behavior. The presence of Cr3+ influenced the magnetic moment, exchange interaction, magnetocrystalline anisotropy constant, and microwave frequency. The samples exhibited second-order magnetic phase transitions and improved magnetocaloric properties compared to stoichiometric cobalt ferrite.
Article
Materials Science, Ceramics
Qingwei Wang, Bowen Lv, Qiong Wu, Xiukun Hu, Xinyao Luo, Jieyang Fang, Nengjun Yu, Hangfu Yang, Minxiang Pan, Hongliang Ge
Summary: In this study, we investigated the critical behavior and magnetocaloric effect of RCrO3 (R = Gd, Dy) polycrystals synthesized by solid-state sintering. The heat capacity fitting curves showed that GdCrO3 and DyCrO3 followed the 3DXY and 3D-Ising models, respectively. Analysis of heat capacity curves, field cooling and zero-field cooling curves revealed two magnetic phase transitions in the samples, with specific transition temperatures for each material. The maximum magnetic entropy change and relative cooling efficiency under a 50 kOe magnetic field were also measured for both samples.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
P. V. Prakash Madduri, S. N. Kaul
Summary: Experimental evidence is presented for the transformation of 'zero-field' para-magnetic (PM)-chiral glass and PM-spin glass transitions into a single PM-ferromagnetic (FM) phase transition at applied magnetic fields in Ni5Al3/NiO nanoparticle compacts. The study accurately determines the critical exponents and characteristic temperatures of the system, showing that the nanoparticle system behaves as a three-dimensional isotropic nearest-neighbor Heisenberg ferromagnet.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xiaojun Yang, Junxiao Pan, Kexi Sun, Yongpeng Shi, Leiming Cao, Shijiang Liu, Weizhuo Gai, Dongliang Chu, Mao Yang
Summary: A comprehensive investigation of the magnetic critical properties and the magnetocaloric effect of the ferromagnetic Weyl semimetal candidate Co2-xZrSn (x approximate to 0.41) single crystals was carried out. The results show that the magnetic properties cannot be described by the mean-field model, with critical exponents suggesting three-dimensional long-range magnetic coupling. The study also reveals a second-order phase transition and the reliability of the deduced critical exponents.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Nawel Khedmi, Khadhraoui Salha, Mohamed Hsini
Summary: In this article, we studied the critical behavior at the ferromagnetic-paramagnetic phase transition in Tb2Rh3Ge alloy and generated the corresponding magnetization curves using Landau theory. The optimized critical exponents were found using the Kouvel-Fisher method and successfully simulated the magnetic entropy change curves.
BULLETIN OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Yong Li, Shuangjiu Feng, Qingrong Lv, Xucai Kan, Xiansong Liu
Summary: By utilizing dc/ac magnetic measurements, the investigation on MnCr2O4 revealed the presence of spin-glass behavior, magnetocaloric effect, and critical behavior. The coexistence of spin-glass component and long-range ferrimagnetic order was demonstrated, along with the reentrant character of spin glass at low temperatures. The study also discussed the magnetocaloric effect in MnCr2O4 and obtained critical exponents close to the mean-field model.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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)