Article
Chemistry, Inorganic & Nuclear
D. I. Turkin, M. V. Yurchenko, K. S. Tolstov, A. M. Shalamova, A. Yu. Suntsov, V. L. Kozhevnikov
Summary: By using the sol-gel method, complex oxides Y0.8Ca0.2BaCo4-xMxO7 with a swedenborgite-type structure were successfully synthesized. The replacement of Y by Ca facilitates doping at cobalt sites. The introduction of iron instead of cobalt leads to a higher temperature for the low-temperature oxygen exchange reaction. The codoped oxides Y0.8Ca0.2BaCo3.8M0.2O7 show phase stability when heated in air up to 1000 degrees C.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Saruchi Rani, Surbhi Verma, Bharti Sharma, Sushil Kumar
Summary: This communication presents the synthesis and characterization of Sn1-xCexO2 (0 <= x <= 1) nanocomposites using a cost effective sol-gel route and spin coating technique. The annealed samples were analyzed using various characterization tools to determine their structural, optical, and thermal properties. The results show the presence of tetragonal SnO2 and cubic CeO2 phases in the annealed samples. The study also investigated the variations in crystallite size, lattice constants, and other parameters with composition. The optical properties, such as complex dielectric constant, extinction coefficient, and refractive index, were studied using optical absorption spectroscopy. Thermal analysis provided insights into thermodynamic parameters such as enthalpy, activation energy, entropy, and Gibbs free energy.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Vasundhara Madaan, Krishan Kumar
Summary: The degradation of rose bengal dye was studied under UV irradiation using CeO2 doped with oxygen-deficient Gd3+ ions prepared via the sol-gel technique. XRD analysis confirmed a single-phase crystalline structure with crystallite size ranging from 7.38 nm to 9.48 nm and lattice parameters ranging from 5.407 angstrom - 5.420 angstrom. HR-TEM analysis revealed spherical particles with sizes in the range of 7.6 nm-9.8 nm. Raman analysis confirmed the presence of oxygen vacancies. The synthesized photocatalysts exhibited excellent degradation performance for rose bengal dye under UV irradiation, with degradation rates increasing from 73.06% to 92.32% upon doping, and thus have potential applications in environmental remediation.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
V. Dolezal, V. Jakes, J. Petrasek, P. Ctibor, O. Jankovsky, K. Rubesova, D. Sedmidubsky
Summary: The perovskite-type phase CaCu3Ti4O12 has promising dielectric properties, but the phenomenon of giant permittivity in this material has not been fully explained. In this study, Europium with similar electronegativity and ionic radius as Calcium was tested as a partial or complete substitute. A series of materials, including CaCu3Ti4O12, Eu0.4Ca0.6Cu3Ti4O12, and EuCu3Ti4O12, were prepared using a sol-gel method and sintering. The influence of microstructure and phase composition on the dielectric properties of the samples, as well as the effect of sintering temperature, was investigated. Secondary phases and microstructure were found to play a significant role in improving the permittivity values, which were found to be giant at higher frequencies but significantly different for specific compositions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Ceramics
Hiroyuki Hayashi, Keita Kouzai, Yuta Morimitsu, Isao Tanaka
Summary: Despite extensive research, accurately predicting successful synthesis conditions for new pseudo-binary oxides remains a challenge. This study introduces a synthesis-condition recommender system to efficiently explore a wide chemistry space and successfully discovered two yet-to-be-found pseudo-binary oxides through systematic synthesis experiments.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Inorganic & Nuclear
Xin Jin, Xianyong Ding, Zheng Qin, Yong Li, Mengjiao Jiao, Rui Wang, Xiaolong Yang, Xuewei Lv
Summary: Calcium metavanadate and magnesium metavanadate are semiconductor materials with visible light-emitting properties, making them ideal candidates for phosphors or optoelectronic devices. Through experimental and theoretical study, their optical, electronic, and lattice dynamic properties have been comprehensively investigated, and their thermal conductivity features have been revealed.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Hao Li, Jiawei Wang, Ziwei You, Yuxi Yu, Pai Li, Liwei Xiong, Yunbin He
Summary: Nb-doped VO2 films were synthesized to enhance thermal sensing abilities, with the thermal hysteresis and resistivity decreasing while the transition temperature range widened as doping content increased. The strategy of Nb doping in VO2 showed promising results for thermal-sensing applications.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Materials Science, Ceramics
S. Swathi, R. Yuvakkumar, G. Ravi, P. Kumar, S. Hong, Omaima Nasif, Sulaiman Ali Alharbi, Dhayalan Velauthapillai
Summary: Tantalum oxide is utilized for water splitting, with Ta2O5 nanopowders produced using the sol-gel process. The calcination time significantly impacts the crystal structure of Ta2O5, leading to different specific capacitance and current density values of Ta2O5 electrodes under various temperature conditions.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
V. V. Zlobin, A. Kuznetsov, D. P. Danilovich, A. N. Bugrov, E. N. Popova, A. Khayrullin
Summary: This article studies the formation and growth processes of nanocrystals with the pyrochlore structure in the TiO2-Gd2O3 system. The study shows that a uniform distribution of titanium and gadolinium atoms in the sample can be achieved through appropriate heat treatment methods. The most promising temperature range for heat treatment is 750-900°C, which allows control of the size of nanocrystals and defects in the pyrochlore structure.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Alejandro Salanova, Ian A. A. Brummel, Andrey A. A. Yakovenko, Elizabeth J. J. Opila, Jon F. F. Ihlefeld
Summary: Temperature limitations in nickel-base superalloys have led to the emergence of SiC-based ceramic matrix composites as a viable replacement for gas turbine components. Rare-earth disilicate coatings have been identified as environmental barriers that can minimize hot component degradation. This study synthesized rare-earth disilicate powders and explored their phase stability and thermal expansion properties, suggesting that microstructure design and crystallographic texture are important for ensuring the thermo-mechanical robustness of the coatings.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Ivan S. Pavlov, Anna G. Ivanova, Vladimir P. Filonenko, Igor P. Zibrov, Alexei E. Voloshin, Pavel V. Zinin, Alexander L. Vasiliev
Summary: This study investigates the formation of boron carbide superhard particles through a liquid-phase reaction at high pressure and high temperature. The synthesized particles exhibit a rhombic hexecontahedron morphology with twelve five-vertex stars. Electron microscopy and X-ray diffraction were used to analyze the crystal structure of these particles, revealing multiple cycling twinning rather than quasi-crystalline symptoms. The specific shape of the particles is explained by the decrease of surface energy during formation at high pressure and high temperature.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Matheus Pianassola, Kaden Anderson, Can Agca, Chris J. Benmore, Jake W. McMurray, Joeerg C. Neuefeind, Charles Melcher, Mariya Zhuravleva
Summary: This study investigates the polymorphic behavior and coefficient of thermal expansion of high-entropy rare-earth sesquioxides (RE2O3) and reveals the influence of average ionic radius (AIR) on their polymorphism. Powder and bead samples of two different compositions were synthesized and analyzed using in situ X-ray diffraction. The polymorphic transitions of high-entropy RE2O3 follow a similar trend to single-RE RE2O3, but with different transition temperatures.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Ceramics
Hongfei Liu, Chenjun Zhang, Zhiping Zhang, Xiangdong Meng, Xianghua Zeng
Summary: Orthorhombic Sc2Mo3O12 films were successfully prepared via spin coating technique followed by annealing at 500-750 degrees C. The crystallinity of the films improved with higher post-annealing temperatures, demonstrating stable negative thermal expansion properties. The coefficients of thermal expansion in different directions were also determined, showing the overall shrinkage and expansion of the thin film.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Diana G. Fukina, Andrey V. Koryagin, Aleksey V. Boryakov, Dmitry N. Titaev, Evgeny V. Suleimanov
Summary: The size induced phase transition of non-cubic beta-pyrochlore compounds Rb0.95NbxMo2-xO6.475-0.5x (x=1.31-1.663) has been studied in detail. It was found that powders with larger particle size exhibited an orthorhombic structure, while powders with smaller particle size exhibited a cubic structure. Crystal structure refinement was performed on the cubic phase, and the reasons for structure reconstruction were discussed. Additionally, the electronic structure and band gap of the compounds were studied, with a comparison between cubic and orthorhombic phases.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Lina Shen, Fanghui Du, Qun Zhou, Tao Xu, Zhongxu Fan, Yali Wen, Jie Wang, Juan Wu, Junwei Zheng
Summary: Developing Co-free LiNiO2-based layered cathode materials is crucial for meeting the demands of lithium-ion batteries with high energy density, long cycling life, and low cost. In this study, LiNi1-X-yAlXMgyO2 materials were synthesized using a solid-solid interface elemental interdiffusion strategy. The incorporation of Mg2+ and Al3+ ions in different layers of the crystal lattice resulted in improved electrochemical performance, such as cycling stability and rate capability. The in-situ XRD characterization and structural analysis revealed that stabilization of the crystal structure, preservation of the integrity of secondary particles, and enlargement of interlayer spacing contributed to the superior performance of the materials. The Mg/Al co-doping strategy shows promise for designing cobalt-free nickel-rich materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Proceedings Paper
Multidisciplinary Sciences
Y. Suresh, S. Annapurna, A. K. Singh, G. Bhikshamaiah
ADVANCED SCIENCE LETTERS
(2016)
Article
Chemistry, Physical
Kasarapu Venkataramana, Chittimadula Madhuri, Y. Suresh Reddy, G. Bhikshamaiah, C. Vishnuvardhan Reddy
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Engineering, Electrical & Electronic
Y. Suresh Reddy, Y. Markandeya, B. Appa Rao, G. Bhikshamaiah
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2018)
Article
Materials Science, Ceramics
Kasarapu Venkataramana, Chittimadula Madhuri, Ch Madhusudan, Y. Suresh Reddy, G. Bhikshamaiah, C. Vishnuvardhan Reddy
CERAMICS INTERNATIONAL
(2018)
Article
Engineering, Electrical & Electronic
Y. Markandeya, Y. Suresh Reddy, Shashidhar Bale, G. Bhikshamaiah
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2018)
Article
Engineering, Electrical & Electronic
S. Varaprasad, K. Thyagarajan, Y. Markandeya, K. Suresh, G. Bhikshamaiah
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2018)
Article
Physics, Applied
S. Varaprasad, K. Thyagarajan, Y. Markandeya, K. Suresh, G. Bhikshamaiah
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2019)
Article
Engineering, Electrical & Electronic
Y. Markandeya, Y. Suresh Reddy, S. Varaprasad, K. Suresh, G. Bhikshamaiah
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2018)
Article
Engineering, Electrical & Electronic
G. Rajender, Y. Markandeya, K. Suresh, A. K. Singh, G. Bhikshamaiah
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Physics, Applied
G. Rajender, Y. Markandeya, Shashidhar Bale, K. Suresh, G. Bhikshamaiah
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2020)
Article
Optics
Padala Ashok, Ravi Kumar Guntu, G. Bhikshamaiah
Article
Engineering, Electrical & Electronic
G. Rajender, Y. Markandeya, K. Suresh, G. Bhikshamaiah
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Proceedings Paper
Engineering, Civil
G. Rajender, Y. Markandeya, A. K. Singh, G. Bhikshamaiah
INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN MATERIALS, MECHANICAL AND CIVIL ENGINEERING
(2018)
Proceedings Paper
Materials Science, Multidisciplinary
B. Srinivasa Goud, Y. Suresh, S. Annapurna, A. K. Singh, G. Bhikshamaiah
MATERIALS TODAY-PROCEEDINGS
(2016)
Proceedings Paper
Engineering, Manufacturing
Y. Suresh, S. Annapurna, G. Bhikshamaiah, A. K. Singh
INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS AND MANUFACTURING APPLICATIONS (ICONAMMA-2016)
(2016)
