Article
Chemistry, Physical
N. A. Zhuk, N. A. Sekushin, M. G. Krzhizhanovskaya, V. A. Belyy, R. Korolev
Summary: Ni-doped CaCu3Ti4O12 ceramics were synthesized with different compositions and their electrical properties were studied. The samples exhibited high dielectric constant and low dielectric loss, which was attributed to the mechanism of ionic charge transfer predominating at room temperature, leading to significant values of impedance phase at low frequencies.
SOLID STATE IONICS
(2021)
Article
Materials Science, Ceramics
Guixiang Liu, Bo Dai, Yong Ren, Kuibao Zhang, Dengjian Ye, Chunfeng Hu, Weitong Zhang, Shuai Fu
Summary: Dense nickel-zinc (NiZn) ferrite ceramics were successfully fabricated within tens of seconds via spark plasma sintering, resulting in high density and small grain size.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yuanyuan Wang, Hongbo Liu, Tingnan Yan, Jianwei Zhao, Shifeng Guo, Rong Sun, Zhilun Lu, Dawei Wang
Summary: In this study, Nb-doped 0.75SrTiO(3)-0.25BiFeO(3) (ST-BF) lead-free ceramics were designed and synthesized, and the effects of Nb doping on microstructure, dielectric, and electrical properties were investigated. It was found that Nb doping led to changes in crystal structure, grain size, and improved dielectric properties, with the 0.03 Nb-doped ST-BF composition exhibiting low dielectric loss and stable dielectric constant. Impedance spectroscopy analysis showed that Nb doping increased the total resistivity, forming an electrically conductive core and a nonconductive shell with enhanced activation energy.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Md Abu Mosa, M. K. Das, F. Alam, M. N. Khan, S. C. Mazumdar
Summary: The role of co-doping with Ba and Sm in BiFeO3 has been studied, and it is found that co-doped samples have improved dielectric and electric polarization properties. Sm doping notably increases the real part of initial permeability and relative quality factor, as well as the coercivity of Bi0.85Ba0.15FeO3 ceramics. This study is of great importance for the fabrication of magnetoelectric devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Jiangpeng Zhao, Li Sun, Ensi Cao, Wentao Hao, Yongjia Zhang, Lin Ju
Summary: Strontium (Sr) doping in CaCu3Ti4O12 (CCTO) ceramics improves dielectric properties and breakdown electric field, with reduced dielectric loss. This suggests that Sr doped at the Ca2+ site enhances the applicability of CCTO and can be used in future practical research.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Harry Peirson, Juncheng Pan, Yizhe Li, David A. Hall, Andy P. Brown, Rik M. Drummond-Brydson, Steven J. Milne
Summary: An unfilled tungsten bronze-structured ferroelectric ceramic, Ca0.28Ba0.72Nb2O6 (CBN28), was doped with Y3+ to create ceramics with various compositions (Ca0.28Ba0.72)1-3w/2YwNb2O6 [0 <= w <= 0.05]. The substitution of Y3+ for Ca2+/Ba2+ resulted in a minor reduction of the lattice parameter and unit cell volume. Doped ceramics showed changes in permittivity, polarization, and temperature stability, indicating potential for high temperature dielectrics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Zunping Xu, Jinchuan Wang, Yi Chen
Summary: BSTBM ceramics doped with 1 mol% B3+ and x mol% Mn2+ were synthesized using citrate combustion technique. The introduction of B3+ and Mn2+ ions reduces the sintering temperature of BSTBM ceramics to 1200 degrees C. The ceramic sample with x = 0.5 shows homogeneous grain size, low dielectric loss, and large polarization. More importantly, it exhibits excellent electrocaloric properties (adiabatic temperature change, Delta T = 0.86 K, and electrocaloric responsivity, Delta T/Delta E = 0.43 Km MV-1) under an electric field of 20 kV/cm and room temperature. Moreover, for this composition, a high Delta T of 3.08 K and Delta T/Delta E of 0.31 Km MV-1 are obtained under an electric field of 100 kV/cm near room temperature.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Longhai Yang, Wenjie Gao, Jiaxing Wang, Chunxiang He, Gaili Yue, Tao Zhang
Summary: Li-doped Bi2/3Cu3Ti4O12 ceramics were successfully prepared, and the effect of Li doping on the crystal structure and dielectric properties was investigated. Li doping improved the dielectric constant and reduced the dielectric loss in the mid-frequency range. The dielectric response at different frequencies was found to originate from different regions within the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
O. Z. Yanchevskii, O. V'yunov, A. G. Belous, L. L. Kovalenko
Summary: The resistances of grain boundary and interface between sample and electrode increase with the combined introduction of Al3+ and F- ions. After 12 hours of sintering, a decrease in dielectric properties was observed due to copper losses. Samples sintered for 10 hours at 1 kHz exhibit specific dielectric parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Jiangting Wang, Shaoyang Shi, Xiang Liu, Huangtao Wu, Hua Wang, Jiwen Xu, Ling Yang, Wei Qiu
Summary: In this study, Er-doped transparent fluorescent ceramics were synthesized using the solid-phase method. The effects of Er3+ on the structure, optical, and electrical properties were investigated. The ceramics showed high transmittance, up-conversion luminescence, and relaxation ferroelectricity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Daimeng Chen, Kuibao Zhang, Jianjun Zeng, Haiyan Guo, Bo Li, Baozhu Luo, Xuegang Huang
Summary: In this study, TiB2-B4C composite ceramics were prepared with Y2O3 and Al2O3 as sintering aids, and the addition of 20 wt% B4C resulted in excellent comprehensive mechanical properties in the composite ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jimei Xue, Fangyuan Ren, Yongpeng Dong, Hanjun Wei, Fan Yang, Laifei Cheng
Summary: SiCN-based ceramics with broadband and strong microwave absorption properties exhibit outstanding electromagnetic wave absorption performance through the unique hetero-interface of Si3N4-BN, Si3N4-SiCN, and BN-SiCN in the ceramics synthesized using the CVI method. This leads to an effective absorption bandwidth covering the entire X-band.
CERAMICS INTERNATIONAL
(2021)
Article
Biochemistry & Molecular Biology
Porntip Siriya, Pairot Moontragoon, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The effects of sintering temperature and doping level concentration on the microstructures, dielectric response, and electrical properties of W6+-doped TiO2 were investigated. The study found that increasing the doping level concentration led to increased grain size and improved low-temperature dielectric response.
Article
Materials Science, Ceramics
Hanjun Wei, Jimei Xue, Yujie Ma, Zexin Hou, Yongpeng Dong, Laifei Cheng
Summary: Doping transition metal elements in a crystal can improve the electromagnetic properties of materials. Fe doping in Sc2Si2O7 ceramics leads to defects and enhancement of magnetic properties, improving microwave absorption efficiency. Controlling Fe content can further optimize the absorption performance of the ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Kun Dai, Ruina Ma, Xing Wang, Zhaoyang Zheng, Yongzhe Fan, Xue Zhao, An Du, Xiaoming Cao
Summary: In this study, composite ceramics of BST-MgO were prepared, and significant improvements in the dielectric constant and dielectric loss were observed with MgO doping. The Curie temperature also showed a shift, providing new solutions for further improving the dielectric properties of the BT-MgO system.
Article
Computer Science, Artificial Intelligence
S. Deivasigamani, C. Senthilpari, Wong Hin Yong
Summary: This study proposes an automatic detection and diagnosis method for epilepsy using soft computing approaches, extracting features from EEG signals and classifying them into focal or non-focal signals for epilepsy detection and diagnosis. The method has been applied in various clinical diagnoses.
JOURNAL OF AMBIENT INTELLIGENCE AND HUMANIZED COMPUTING
(2021)
Review
Metallurgy & Metallurgical Engineering
Kiflom Gebremedhn Kelele, Aschalew Tadesse, Tegene Desalegn, Suresh Ghotekar, Ruthramurthy Balachandran, Hanabe Chowdappa Ananda Murthy
Summary: BST nanomaterials with enhanced permittivity and dielectric properties, due to their nanoproperties, have attracted great interest for various applications. Introduction of metal ion dopants significantly alters the properties of BST, including structural, morphological, electrical and optical characteristics.
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
F. A. Jusoh, K. B. Tan, Z. Zainal, S. K. Chen, C. C. Khaw, O. J. Lee, R. Balachandran, H. C. Ananda Murthy
Summary: A moderate pyrochlore solid solution range of 0.00 <= x <= 0.64 was observed in the Bi3.36Fe2.08+xSb2.56-xO14.56-x (BFS) system. The BFS pyrochlores demonstrated refined lattice parameters and electrical responses, with thin films showing good capacitive behavior and electrochemical reversibility. This indicates that BFS pyrochlores are suitable for Class 1 ceramic capacitors.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Multidisciplinary
S. Deivasigamani, G. Narmadha, C. Senthilpari, Wong Hin Yong, P. K. Rajesh
Summary: This paper proposes a simple and efficient method for classifying EEG signals using a Support Vector Machine classifier, and evaluates the performance of the proposed EEG signals classification system in terms of Sensitivity, Specificity, and Accuracy.
JOURNAL OF ENGINEERING RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Eneyew Tilahun Bekele, H. C. Ananda Murthy, Dhanalakshmi Muniswamy, Yeshaneh Adimasu Lemenh, Minale Shegaw Shume, Gezahegn Tadesse Ayanie, Avvaru Praveen Kumar, C. R. Ravikumar, R. Balachandran, Arpita Roy
Summary: Green synthesis of spherical Co3O4 nanoparticles using Solanum tuberosum leaf extract as a template was performed in this study. The synthesized Co3O4 NPs showed different crystalline sizes and band gap widths depending on the volume ratios. Co3O4 NPs-modified electrodes exhibited enhanced sensing capability towards ascorbic acid and citric acid.
BIOINORGANIC CHEMISTRY AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Kiflom Gebremedhn Kelele, H. C. Ananda Murthy, Ruthramurthy Balachandran, Aschalew Tadesse, Yosef Nikodimos, Lemma Teshome Tufa, Jaebeom Lee
Summary: Barium strontium titanate (BST) and Mo-doped BST nanopowders were synthesized and characterized in this study. The incorporation of Mo affected the crystal size, specific surface area, and pore structure of BST. The presence of Mo in BST was confirmed by XPS, EDS, Raman spectroscopy, and FTIR spectroscopy.
Article
Chemistry, Inorganic & Nuclear
Kiflom Gebremedhn Kelele, H. C. Ananda Murthy, Ruthramurthy Balachandran, Aschalew Tadesse, Yosef Nikodimos, Lemma Teshome Tufa, Jaebeom Lee
Summary: Both barium strontium titanate (BST) and its selenium doped sample were synthesized through a sol-gel method and their microstructural and morphological effects were studied. The addition of selenium affected the crystal size, lattice parameter, particle size, specific surface area, and morphology of the BST materials.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Kiflom Gebremedhn Kelele, H. C. Ananda Murthy, Ruthramurthy Balachandran, Aschalew Tadesse, K. B. Tan
Summary: The goal of this research was to examine the differences in dielectric properties between barium strontium titanate (BST) and BST doped with molybdenum. The results showed that the addition of Mo6+ ions reduced the crystallite and particle size of BST, while increasing its dielectric constant and reducing dielectric loss. These changes make BST doped with Mo suitable for various applications.
MATERIALS TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Balachandran Ruthramurthy, Kiflom Gebremedhn Kelele, H. C. Ananda Murthy, Kar Ban Tan, Kah Yoong Chan, Dhanalakshmi Muniswamy, Aschalew Tadesse, Suresh Ghotekar
Summary: Due to the growing demand and wastage of energy, there is a need for storing energy efficiently. Capacitors are materials designed for this purpose, and ferroelectric materials, particularly perovskites, are preferred for capacitor applications. Barium strontium titanate (BST) nanomaterial, a type of perovskite material, has been found to possess improved dielectric properties when doped with metal/metal oxides. Multielement doping or codoping has shown even better dielectric properties in BST compared to unidoping. Studies on codoped BST capacitors have demonstrated their potential use as efficient and effective energy storage devices. We believe that this work contributes to the understanding of the enhancement of dielectric properties in codoped BST nanomaterials.
JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Mian-En Yeoh, Kah-Yoong Chan, Hin-Yong Wong, Pei-Ling Low, Zi-Neng Ng, H. C. Ananda Murthy, Ruthramurthy Balachandran
Summary: Globally, the hydrothermal method is commonly used to synthesize TiO2 photoanodes for various applications, but it is often complex and difficult to follow. This study successfully developed a reinvented hydrothermal synthesis methodology, which demonstrated a mixed-phase TiO2 photoanodes without several intermediate hydrothermal steps. The DSSC devices fabricated using this methodology showed comparable and excellent power conversion efficiency (η=3.30%) to commercial TiO2-based DSSCs (η=3.81%). This preliminary study provides new perspectives on simplifying wet chemical synthesis techniques for TiO2 in the design of DSSCs.
Article
Materials Science, Multidisciplinary
Mian-En Yeoh, Kah-Yoong Chan, Hin-Yong Wong, Pei-Ling Low, Gregory Soon How Thien, Zi-Neng Ng, Hanabe Chowdappa Ananda Murthy, Ruthramurthy Balachandran
Summary: In this study, the influence of hydrothermal duration on the self-assembled TiO2 photo-anode was investigated. It was found that adjusting the hydrothermal duration can control the rutile content in the TiO2 photo-anodes, thereby improving the efficiency of dye-sensitized solar cells.
Article
Chemistry, Multidisciplinary
Temesgen Achamo, Enyew Amare Zereffa, H. C. Ananda Murthy, Venkatesha Perumal Ramachandran, Ruthramurthy Balachandran
Summary: Copper oxide nanoparticles (CONPs) with desirable properties, including semiconductor nature, antimicrobial and antioxidant potential, as well as DNA binding activity, were successfully synthesized using ethanolic leaf extract of the indigenous plant Artemisia abyssinica.
GREEN CHEMISTRY LETTERS AND REVIEWS
(2022)
Article
Computer Science, Information Systems
Md Mushfiqur Rahman, Md Shabiul Islam, Mohammad Tariqul Islam, Samir Salem Al-Bawri, Wong Hin Yong
Summary: This paper investigates a unit cell of a single-negative metamaterial structure loaded with a meander line and defected ground structure (DGS) as the main radiating element of an antenna. By optimizing the parameters, the antenna achieves resonances at two different frequencies and enhances the bandwidth.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Chemistry, Multidisciplinary
H. C. Ananda Murthy, Tegene Desalegn Zeleke, K. B. Tan, Suresh Ghotekar, Mir Waqas Alam, R. Balachandran, Kah-Yoong Chan, P. F. Sanaulla, M. R. Anil Kumar, C. R. Ravikumar
Summary: The synthesis of green copper oxide nanoparticles mediated by Vernonia amygdalina Del. was reported, showing efficient antibacterial and dye degradation properties along with multifunctional applications.
RESULTS IN CHEMISTRY
(2021)
