Article
Materials Science, Ceramics
Zhenjun Qing, Huapeng Zou, Xin Zhou, Haiyan Li, An Liu, Shumin Duan, Yingxiang Li, Sen Peng
Summary: Li2Co2Mo3O12 (LCMO) ceramics were synthesized using the solid-state reaction method, and their microwave dielectric properties and influencing factors were studied. It was found that ionic polarizability was the main factor affecting the dielectric constant (er), while relative density had a significant impact on the quality factor (Q x f). In addition, the microwave dielectric properties of LCMO ceramics were closely related to ionicity, lattice energy, bond energy, and thermal expansion coefficient of chemical bonds.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaoqing Chen, Hao Li, Pengcheng Zhang, Gaosheng Li
Summary: Co2P2O7 ceramics were prepared using traditional solid-state sintering technique, with research conducted on their phase composition, grain size distribution, and densification. The influence of pores on permittivity, dielectric loss dependency on porosity, and the low values of ε(r) explained by covalent P-O bonds were explored, along with the relationship between polar phonon modes and dielectric properties using Raman spectroscopy. Optimum dielectric properties were achieved at 1160 degrees C for 4 hours.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Ashutosh K. Singh, Maedeh Pahlevaninezhad, Nael Yasri, Edward P. L. Roberts
Summary: The charge-discharge operation of vanadium redox flow batteries leads to electrode degradation, affecting performance and efficiency. The study shows that electrode degradation is more pronounced in the negative electrode, with differences in mechanism between positive and negative electrodes. Analysis of Raman mapping and X-ray photoelectron spectroscopy reveals changes in surface oxygen functional groups after degradation, indicating differences in degradation mechanism between the two electrodes.
Article
Materials Science, Ceramics
Cristina Pascual-Gonzalez, Carolina Elicker, Mario L. Moreira, Sergio Cava, Iasmi Sterianou, Dawei Wang, Antonio Feteira
Summary: (1 - x)KNbO3-xBiMnO(3) (0 <= x <= 0.25) ceramics were prepared using the solid-state reaction method. Bi and Mn were found to have low co-solubility in the orthorhombic structure. Both orthorhombic and pseudocubic crystal structures coexist within a certain range, and the grain size distribution shows bimodal behavior. Several anomalies in the dielectric behavior and phase transitions confirm the coexistence of crystal symmetries. Furthermore, it was discovered that the bandgap of KNbO3 can be tailored by co-doping Bi and Mn, resulting in a narrowing bandgap with increasing x.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Damjan Vengust, Bostjan Jancar, Tilen Sever, Andreja Sestan, Vid Bobnar, Zdravko Kutnjak, Nina Daneu, Danilo Suvorov, Matjaz Spreitzer
Summary: A novel approach to synthesizing complex composite materials based on intergrowths of sodium and calcium cobaltates was presented in this work, resulting in samples with excellent thermoelectric performance and improved stability. The mixed Ca-Na composition developed textured microstructures composed of intergrowths of both end-members, with the composition x = 0.8 (Ca:Na = 2.75) showing long-term stability after exposure to high humidity.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jingkang Xu, Xiaohui Wu, Hua Su, Yuanxun Li, Xiaoli Tang
Summary: The addition of LBSCA glass was found to significantly influence the microwave dielectric properties of LNT ceramics, improving the quality factor and reducing the sintering temperature. After sintering at 925 degrees C, the sample with 0.4 wt% LBSCA exhibited excellent performance, making it suitable for low-temperature co-fired ceramic technology.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zexing Wang, Yunfeng Guo, Jiamao Li
Summary: In this paper, a series of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics were prepared via the conventional solid-state method. The influences of (Co1/3Nb2/3)4+ complex ions on the phase composition, spectral characteristics, microstructure, and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics were systematically studied. The study found that the presence of (Co1/3Nb2/3)4+ content affected the structure, performance, and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mohd Azaj Ansari, A. R. James, K. Zimik, Renuka Bokolia, R. S. Kundu, K. Sreenivas
Summary: Ferroelectric ceramic compositions modified with varying erbium content were prepared and investigated for their structural, electrical, and light upconversion properties. The study showed that the erbium dopant induced changes in the dielectric phase transitions and exhibited multifunctional properties.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Congxue Su, Liang Fang, Laiyuan Ao, Qianbiao Du, Yifan Zhai, Jie Li, Junqi Chen, Ying Tang, Laijun Liu
Summary: By substituting Zr4+ with Sn4+, the packing fraction is increased and the Q x f value is enhanced, resulting in good microwave dielectric properties. A smaller oxygen bond valence contributes to the improvement of the microwave dielectric properties of the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Geng Wang, Qiuyun Fu, Pengju Guo, Ming Hu, Huanhuan Wang, Shijin Yu, Zhiping Zheng, Wei Luo
Summary: High dielectric constant ceramics were synthesized via solid-state reaction, with decreasing rare-earth ion radius leading to lower dielectric constant. The increase in quality factor was associated with higher packing fraction and narrower Raman vibration modes, while negative shift in TCF was related to decreased TiO6 octahedral tilt angle. Infrared reflection spectroscopy indicated dominant infrared vibration modes in microwave dielectric polarization.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Linfei Li, Jeremy F. Schultz, Sayantan Mahapatra, Zhongyi Lu, Xu Zhang, Nan Jiang
Summary: By using ultrahigh vacuum tip-enhanced Raman spectroscopy (UHV-TERS), single oxygen adatoms on a boron monolayer (borophene) can be identified and mapped with a spatial resolution of approximately 4.8 angstrom and single bond sensitivity. This technique enables the atomically defined, chemically homogeneous, and thermally reversible oxidation of borophene via atomic oxygen in UHV. Additionally, it reveals the propensity of borophene towards molecular oxygen activation at room temperature and phase-dependent chemical properties. Overall, this work demonstrates the powerful utility of UHV-TERS in probing the local chemistry of surface adsorbates in the atomic regime and has important applications in heterogeneous catalysis, on-surface molecular engineering, and low-dimensional materials.
NATURE COMMUNICATIONS
(2022)
Review
Materials Science, Multidisciplinary
Mikhail Shekhirev, Christopher E. Shuck, Asia Sarycheva, Yury Gogotsi
Summary: The field of MXene continues to grow as more research groups investigate this large class of 2D materials. While synthesis and applications have been widely discussed, the importance of characterization is often overlooked. This review focuses on various advanced characterization techniques for understanding the precursor suitability, successful synthesis, composition, structure, and properties of MXene.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Physics, Condensed Matter
Piyush K. Patel, Hemant Singh, K. L. Yadav
Summary: By optimizing the sintering temperature, giant dielectric constant was achieved in the BZFN ceramics sample. Zr doping suppresses semiconducting behavior, reducing dielectric loss and hindering reoxidation reactions at grain boundaries. Impedance spectroscopy experiments detected electrical heterogeneities within the materials.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Fu-Song Ma, Qun Zeng, Yan-Zhao Feng, Chun-Feng Yao, Chao -Chao Guo
Summary: The phase composition, microstructure, and microwave dielectric properties of (Zn1/3Nb2/3)(4+) substitution in LiNb0.6Ti0.5O3 ceramics were studied. The substitution caused the expansion of the titanium oxide octahedral framework and increased the dielectric constant. However, the high-temperature sintering of doped ions increased oxygen vacancies and negatively affected the quality factor.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Sudhanshu Kumar, K. Sreenivas
Summary: The structural and magnetic properties of as-prepared and annealed MgFe2O4 nano-powders prepared by auto-combustion method using dl-alanine fuel were investigated. Annealing at different temperatures resulted in changes in crystallite size, saturation magnetization, and coercivity, which were correlated with variations in cation distribution in the octahedral and tetrahedral sites. Residual carbon, hydrogen, and nitrogen content in the powders were found to decrease after annealing at 900 degrees Celsius in air.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
J. Dhanya, A. V. Basiluddeen, R. Ratheesh
SCRIPTA MATERIALIA
(2017)
Article
Materials Science, Ceramics
Johnson Dhanya, Elattuvalappil Kalathil Suresh, Rajaram Naveenraj, Ravendran Ratheesh
CERAMICS INTERNATIONAL
(2018)
Article
Engineering, Electrical & Electronic
A. N. Unnimaya, E. K. Suresh, J. Dhanya, R. Ratheesh
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2014)
Article
Engineering, Electrical & Electronic
J. Dhanya, A. N. Unnimaya, R. Ratheesh
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2014)
Article
Materials Science, Ceramics
Johnson Dhanya, Padinjare V. Sarika, Rajaram Naveenraj, Elattuvalappil K. Suresh, Ravendran Ratheesh
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Johnson Dhanya, Elattuvalappil Kalathil Suresh, Rajaram Naveenraj, Ravendran Ratheesh
JOURNAL OF ELECTRONIC MATERIALS
(2019)
Proceedings Paper
Materials Science, Multidisciplinary
Dhanya Johnson, Thomas Johnson
MATERIALS TODAY-PROCEEDINGS
(2015)