Article
Engineering, Electrical & Electronic
Jiali Song, Zhi Wang, Yu Gao
Summary: Different annealing temperatures were used to prepare nanocrystalline Li0.35Ni0.3Fe2.35O4 ferrites through sol-gel auto-combustion method. The annealing temperature significantly affected the structure and magnetic properties of the synthesized Li-Ni ferrites, leading to an increase in grain size. The changes in saturation magnetization and coercivity were related to the occupation of ions in the crystal lattice and the size of the grains after annealing.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Chuan Chen, Qiang Zhang, Tianhao Yao, Hongkang Wang
Summary: This study reports a novel synthesis of shuttle-shaped NiCuZn ferrites through electrospinning and subsequent sintering, and systematically investigates the microstructural evolution and its effect on magnetic properties upon annealing at temperatures ranging from 500 to 1000 degrees C. The results show that the crystallite size decreases and the grain size increases with increasing sintering temperature, leading to an upward trend in saturation magnetization until a certain point where the crystalline structure and morphology change, resulting in lowered saturation magnetization.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Fangyi Huang, Hua Su, Qin Zhang, Xiaohui Wu, Yulan Jing, Yuanxun Li, Xiaoli Tang
Summary: The effect of Ti substitution on the microwave dielectric properties and structural characteristics of CaMgSi2O6 ceramics was investigated. It was found that the increase in Ti content led to the formation of CaTiO3, and the permittivity was correlated with ionic polarizability. The quality factor and temperature coefficient of resonant frequency were significantly influenced by lattice stability. Lattice energy and cation bonding also affected the microwave dielectric properties, and adjusting these parameters improved the performance of the ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
M. S. Raja Seetharaman, P. Sivagurunathan
Summary: In this study, spinel ferrite nanoparticles with the chemical formula of MgxCo1 - xFe2O4 (x = 0.3, 0.5, 0.7) were successfully synthesized using the co-precipitation method. The structural, functional, morphological, and magnetic properties of the magnesium cobalt ferrite nanoparticles were discussed. The synthesized materials exhibited potential as high-density recording media applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Susmita Rabha, Pamu Dobbidi
Summary: Development of (1-x) MgTiO3 (MTO)-x SrTiO3 (STO) composite ceramics and tuning of temperature coefficient of resonant frequency (tau(f)) near to zero through solid state reaction method have been reported. The physical diffusion of MTO and STO crystals together to form a single crystal structure without any chemical interaction was observed. An increase in dielectric constant with STO content was obtained, while the temperature-dependent dielectric constant exhibited significant dispersion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Yalagala Sandeep, T. Rambabu, Laxminarayana Kunja, Oimang Borang, G. Aravind, Aparna Dode, V Nathanial
Summary: Nano-crystalline particles of erbium-substituted Ni-Zn ferrites were successfully synthesized by sol-gel autocombustion method. The size and lattice parameters of the particles decreased with increasing Erbium ion concentration. The electrical and magnetic properties exhibited variations with frequency and Er3+ concentration.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Minal Gupta, Omkar V. Rambadey, Pankaj R. Sagdeo
Summary: This study investigates the correlation between the effect of R-cation radii and the structural, vibrational, optical, and dielectric properties of rhombohedral rare earth aluminates. The results show that the decrease in R-cation radii leads to structural distortion, an increase in energy bandgap, and a decrease in dielectric constant.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
K. Iben Nassar, N. Rammeh, S. Soreto Teixeira, M. P. F. Graca
Summary: This study investigates the effects of substituting La with Pr on the electrical and magnetic properties of the compound La2-xPrxNiMnO6. The results show that Pr doping leads to a decrease in dielectric constant and the presence of relaxation phenomenon. Moreover, the electrical conductivity follows the Arrhenius law, and the Curie temperature decreases with increasing Pr content.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Condensed Matter
Mehrnoush Nakhaei, Davoud Sanavi Khoshnoud
Summary: Nanoparticles of ReFeO3 orthoferrites were successfully synthesized and their structural, magnetic, and electrical properties were thoroughly investigated. The study revealed that SmFeO3 shows a ferromagnetic trend, while the other compounds exhibit weak ferromagnetic behavior. The magnetic behaviors of the nanoparticles were discussed based on the magnetization of Re and Fe sublattices and a core-shell model.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Engineering, Electrical & Electronic
Md. Harun-Or-Rashid, M. Nazrul Islam, M. Arifuzzaman, A. K. M. Akther Hossain
Summary: The effects of sintering temperature on the properties of polycrystalline Ni0.3Cu0.2Zn0.5Fe2O4 and Ni0.3Cu0.2Zn0.5Sc0.05Fe1.95O4 compounds have been thoroughly studied. It was found that the different sintering temperatures and scandium doping levels have significant impact on the structural, morphological, magnetic, dielectric, and electrical characteristics of these spinel ferrites. The investigated ferrites exhibit potential for various practical applications due to their high initial permeability, low magnetic loss, and low electrical conductivity across a wide frequency range.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Zhe Xiong, Xing Zhang, Zixuan Fang, Wenjuan Wu, Lezhong Li, Bin Tang, Shuren Zhang
Summary: By doping with (Al0.5Nb0.5)(4+) in Ca0.61Nd0.26TiO3 material, the quality factor of the samples was increased by nearly 60%. Subsequently, samples in the x range of 0-0.12 formed a single perovskite-structured phase, with a decrease in grain size as x increased, leading to a decline in dielectric constant and electrical conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
R. E. El shater, A. W. Awad, E. K. Abdel-Khalek, H. H. El-Bahnasawy, T. M. Meaz, Ehab A. Okba
Summary: Two ferrite series, one consisting of nanosize samples prepared by co-precipitation and the other consisting of bulk samples sintered at 1000 degrees C, were synthesized and analyzed. The nanomaterials exhibited larger crystallite size, theoretical density, and porosity compared to the bulk materials. Aggregation of nanoparticles was observed in the nanoscale samples, while the bulk specimens had limited surface area. Raman spectroscopy confirmed the presence of the spinel phase and variations in cation occupation ratios. Optical characterization indicated that the absorption cutoff frequency decreased with increased chromium content. The average optical bandgap was 3.6 eV for nanosamples and 4.6 eV for bulk materials. The strongest photoluminescence emission was observed at wavelengths between 415 and 460 nm, with red-shifted emission peaks in both bulk and nanoscale materials. Sintering resulted in an increase in photoluminescence.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
R. Brahem, Z. Raddaoui, M. Bourguiba
Summary: The research investigates the effect of rare earth ions on LRCSM manganites, showing that Er-doped compounds exhibit a better dielectric behavior and potential applications in electronic devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Xingyu Chen, Yeqing Guan, Zhaolin Zhong, Fenglin Wang, Wei Li, Haijun Mao, Zhuofeng Liu, Weijun Zhang
Summary: The effect of Zr4+ substitution for Ti4+ on the phase evolution and microwave dielectric properties of (Cu1/3Nb2/ 3)0.25Ti0.75-xZrxO2 ceramics was investigated. With the increase of Zr substitution, the ceramics showed a phase transition from a tetragonal rutile phase to an orthorhombic srilankite phase. The Zr substitution greatly influenced the microstructure of the ceramics, particularly for compositions where x > 0.1. The microwave dielectric properties of the ceramics were closely related to the phase transition process, with the optimum properties obtained at x = 0.3.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Jie Li, Haokai Su, Yahui Sun, Gang Wang, Feng Gao, Xuening Han, Zheng Liang, Qiang Li
Summary: In this study, Zn2+-substituted Li2MgSiO4 ceramics were synthesized using a solid-state method, with the addition of LiF sintering aid to improve their microwave dielectric properties. The substitution of Zn2+ ions increased grain size and uniformity, impacting the densification of the ceramics. Optimal bulk density and excellent microwave dielectric properties were achieved with a Zn2+ ion content of x=0.10.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Xiaofei Wang, Chao Zhang, Guozhong Zang, Shijie Lv, Liben Li
JOURNAL OF ALLOYS AND COMPOUNDS
(2015)
Article
Materials Science, Multidisciplinary
Xiaofei Wang, Guozhong Zang, Qiubo Hu, Chao Zhang, Shijie Lv, Liben Li
Article
Materials Science, Multidisciplinary
Xiaofei Wang, Qiubo Hu, Guozhong Zang, Chao Zhang, Liben Li
MATERIALS CHEMISTRY AND PHYSICS
(2017)
Article
Physics, Condensed Matter
Xiaofei Wang, Qiubo Hu, Guozhong Zang, Chao Zhang, Liben Li
SOLID STATE COMMUNICATIONS
(2017)
Article
Materials Science, Ceramics
Xiaofei Wang, Qiubo Hu, Guozhong Zang, Chao Zhang, Liben Li
CERAMICS INTERNATIONAL
(2018)
Article
Materials Science, Multidisciplinary
Xiaofei Wang, Qiubo Hu, Chao Zhang, Guozhong Zang, Dandan Wang, Fengzi Zhou, Liben Li
MATERIALS RESEARCH EXPRESS
(2018)
Article
Chemistry, Physical
Xiaofei Wang, Shijie Lv, Chao Zhang, Qiubo Hu, Liben Li
JOURNAL OF ALLOYS AND COMPOUNDS
(2013)
Article
Physics, Condensed Matter
Xiaofei Wang, Mengle Sun, Chao Zhang, Liben Li, Qingdong Chen
SOLID STATE COMMUNICATIONS
(2013)
Article
Physics, Condensed Matter
Xiaofei Wang, Zhaowu Wang, Qiubo Hu, Chao Zhang, Dandan Wang, Liben Li
SOLID STATE COMMUNICATIONS
(2019)
Article
Physics, Multidisciplinary
Qiubo Hu, Dahu Chang, Jianfeng Su, Ruirui Sun, Dongmei Zhang, Xiaofei Wang
Article
Physics, Condensed Matter
Qiu-Bo Hu, Xiang-Yang Guo, Xiu-Yun An, Jia Liu, Feng Shan, Chun-Juan Tang, Zhi-Yu Min, Xiao-Fei Wang
Summary: Lead-free xBiFeO(3)-(1-x)BaTiO3-SrTiO3 solid-solution ceramics were synthesized and their structure, dielectric, and ferroelectric properties were studied. It was observed that the dielectric relaxation process triggered by polar nanoregions (PNRs) related to the Fe2+/Fe3+ valences may cover the relaxation process induced by oxygen vacancies (OVs) at specific temperatures. The changes in relaxation peak heights indicated that the concentration of PNRs increased while the concentration of OVs decreased with increasing annealing temperature and BiFeO3 content. Cole-Cole diagram analysis suggested that the dielectric relaxations were influenced by changes in grain interior, grain boundary, and the electrode/ceramic interface.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Yanglei Ou, Xiaofei Wang, Qiubo Hu, Yinmin Li, Fengzi Zhou, Liben Li
Summary: By calculating the activation energy, analyzing XPS energy spectrum, and conducting oxygen treatment experiment, we investigated the origin of high temperature dielectric relaxation behavior of ST-xZS ceramics. We concluded that the relaxation in pure ST ceramics is caused by the migration of Vo. However, as the ZS content increases, the relaxation related to Vo migration gradually transforms into the influence of Ti4+ ion polarization, and the possible causes of relaxation behavior dependence are analyzed in detail.
INTEGRATED FERROELECTRICS
(2023)
Article
Physics, Applied
Xiaofei Wang, Qiubo Hu, Zhenhao Wang, Fengzi Zhou, Liben Li
Summary: Lead-free solid-solution ceramics were successfully synthesized and their structure, dielectric, and energy storage properties were studied. The research revealed a high-temperature dielectric relaxation behavior and analyzed the causes of energy storage behavior in a specific composition material.
MODERN PHYSICS LETTERS B
(2022)
Article
Physics, Applied
Tianyang Liu, Xiaofei Wang, Congcong Li, Bowen Shen, Mingyan Yao, Xinyang Pei, Yahui Yang, Yanglei Ou, Zhaofei Zhu, Liben Li
Summary: SLTO ceramics with giant dielectric constant were prepared by the traditional solid-state method and the temperature-dependent dielectric constant was studied. Two sets of relaxation peaks were observed at different temperature ranges, corresponding to relaxation processes related to oxygen vacancy migration and Sr or Ti defects at different frequencies.
MODERN PHYSICS LETTERS B
(2021)
