Article
Engineering, Electrical & Electronic
Huihui Xie, Jinsheng Li, Shuzhen Yang, Lei Wu, Pengfei Li, Xiwei Qi
Summary: The successful fabrication of high entropy ceramics (La0.2Pr0.2Nd0.2Sm0.2Eu0.2)(2)Ce2O7 was achieved using the solid-state reaction method. The study showed that sintering temperatures significantly influenced the structure and properties of the ceramics. The high entropy ceramics exhibited good dielectric stability at high frequencies and potential application value in the field of microelectronics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
A. Sotelo, P. Amirkhizi, O. J. Dura, G. Garcia, A. C. Asensio, M. A. Torres, M. A. Madre, A. Kovalevsky, Sh Rasekh
Summary: The attrition-milling process was used to obtain small grain-size powders from Ce-doped CaMnO3 precursors. By reducing the atomic proportion of dopant and optimizing the sintering process, the material showed improved thermoelectric performances and high ZT values. This approach is promising for large-scale production of oxide-based thermoelectric modules.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Dharmendra Yadav, Gurudeo Nirala, Sushma Yadav, Upendra Kumar, Shail Upadhyay, Satyam Kumar
Summary: Samples of the system SrCe1-xGdxO3 (x = 0.0, 0.02, 0.04, 0.06, and 0.10) were prepared and investigated for their structure, properties, and conductivity, showing potential as mixed ionic and electronic conductors for SOFCs. The incorporation of Gd into the lattice reduced the optical bandgap and grain size, with the highest conductivity observed for SrCe0.98Gd0.02O3 at 600 degrees C. XPS spectra confirmed the presence of Ce in different states and oxygen vacancies, which were further analyzed using Raman spectroscopy.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Ceramics
Zenghui Liu, Jun Xu, Junni Zhai, Zhixuan Guo, Hongyan Wan, Tao Xue, Jingrui Li, Gang Niu, Peng Shi, Lingyan Wang, Wei Ren, Bian Tian, Hongzhong Liu, Zhuangde Jiang, Zuo-Guang Ye
Summary: Preparation condition plays a critical role in the structure and properties of ceramics. In this study, the effects of sintering temperature on the crystal structure, microstructure, and electrical conductivity of LaCrO3-based conducting oxides were investigated. It was found that the calcining temperature can be reduced by using nano-powders as raw materials. The sintering temperature-induced structural transition and the enhancement of electrical conductivity by introducing Sr and Ca ions were also observed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Yuqiao Zhang, Hai Jun Cho, Feng Jiang, Chengliang Xia, Yue Chen, Weishu Liu, Hiromichi Ohta
Summary: The modulation of electrical and thermal conductivities of BTNO epitaxial films was systematically investigated in this study. By controlling the Ti/Nb ratio, both the lattice structures and conduction band were modulated, affecting the electrical and thermal conductivities. A phase transition was detected at x similar to 0.5, impacting both the electron and heat transports. By controlling the lattice distortion, conduction band, and phase transition, the electrical and thermal conductivity of BTNO epitaxial films can be modulated within a much greater range.
Article
Materials Science, Multidisciplinary
Abhinav Yadav, I. P. Raevski, P. M. Sarun
Summary: Structural, microstructural, and electronic state investigations of NaNb1-xZrxO3 ceramics were performed. The ceramics showed orthorhombic phase structure and exhibited thermal hysteresis and polymorphic phase transition. The conduction mechanism was found to be related to oxygen vacancies and charge neutrality. These findings contribute to a better understanding of the physical properties and conduction behavior of this ceramic material.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Xiaoying Guo, Weifeng Zhang, Shan Wu, Chaozhong Sun, Changzheng Hu, Laijun Liu, Liang Fang, Nengneng Luo
Summary: BRCN ceramics were synthesized using high-temperature solid-state reaction, exhibiting a tetragonal tungsten bronze structure. The decrease in rare-earth ion radius caused a decrease in unit cell volume and shifting of Raman peaks to high frequency, along with an increase in dielectric constant peak temperature.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Condensed Matter
Muhammad Umer Iqbal, Sumayya, Sajid Butt, Muhammad Umer Farooq, Shahid Hussain, Syed Irfan, Nazakat Ali, Muhammad Abdul Basit, Muhammad Aftab Akram, Muhammad Yasir, Ather Hassan
Summary: During the last decade, misfit layered calcium cobaltite (Ca3Co4O9) has been explored as a potential thermoelectric material. In this study, the thermoelectric properties of Ca3Co4O9 were improved by synthesizing composites with different wt.% of Cu. The composites were consolidated into bulk ceramics and their structure was analyzed, revealing a multiphase system. The sample containing 5% Cu demonstrated the highest power factor at 973K, which resulted from the simultaneous improvement in electrical conductivity and Seebeck coefficient. The conduction mechanisms were further discussed.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Ceramics
Hao Sun, Bo Zhang, Qing Zhao, Yafei Liu, Ruifeng Wu, Su Zhang, Yanqing Li, Aimin Chang
Summary: This article investigates the photoluminescence and conductive properties of CaEuNbMoO8 solid solution ceramics and finds their potential applications in near-ultraviolet excited light-emitting diodes and thermistors.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Don Biswas, Prolay Sharma, N. S. Panwar
Summary: The study investigated the structural and phase transitions of NKN samples using dielectric measurements and high temperature X-ray diffraction. Results showed different phase transitions at various temperature ranges in the samples.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xiaoyan Zhang, Jinsheng Li, Bo Ni, Rutong Yang, Huihui Xie, Shuzhen Yang, Xiwei Qi
Summary: This study investigates the effects of sintering temperatures on the crystal structure, microstructure and dielectric properties of novel high-entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)Nb2O6-delta tungsten bronze ceramics. The results demonstrate that high-density ceramics with tetragonal tungsten bronze structures can be obtained at sintering temperatures of 1250-1350 degrees C. The dielectric properties are influenced by both frequency and temperature, and show significant improvement through the high-entropy effect.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Masahiro Yasukawa, Koki Tsurushima, Shuri Matsuda
Summary: Microstructure of Bi2O3-added WO3 ceramics was controlled by adjusting Bi/W atomic ratio and firing temperature. Higher power factors were observed in ceramics with larger WO3 grains due to higher electron carrier concentrations, resulting in higher figure of merit ZT values. The highest ZT value of 2.4 x 10-3 at 873 K was achieved for ceramics fired at 1223 K.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Pinar Kaya, Y. Eren Suyolcu, Peter A. van Aken, Servet Turan, Giuliano Gregori, Joachim Maier
Summary: The addition of Yb2O3 to Sm-bearing AlN ceramics significantly reduces thermal conductivity and increases grain boundary resistivity. On the other hand, the use of Sm2O3 as a sintering aid leads to an increase in electrical resistivity due to secondary phases at grain boundaries and triple junctions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Wen Ma, Yuanming Gao, Jingxin Zhang, Yu Bai, Ruiling Jia, Hongying Dong, Ruijun Wang, Manyu Bao
Summary: Ceramics of Sr-x(Zr0.9Y0.05Yb0.05)O1.95+x (x=1.0, 0.9, 0.8, 0.7) were prepared by solid state reaction sintering, showing significant grain growth inhibition and high thermal expansion coefficients. These materials are promising for use in high temperature environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Motahare S. Mohseni-Salehi, Ehsan Taheri-Nassaj, Alireza Babaei, Mehdi Soleimanzade
Summary: This study investigated the effect of different aluminum and vanadium precursors on the formation and physical properties of the V2AlC MAX phase. The results showed that elemental precursors are more favorable for the synthesis of V2AlC. Furthermore, the presence of at least one metallic element is crucial for accelerating phase formation. The sample with fine powders of VC and aluminum as precursors exhibited the highest electrical conductivity. Additionally, the sample with metallic elemental precursors for both vanadium and aluminum sources showed the highest purity and electrical conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Environmental Sciences
Sarunas Varnagiris, Marius Urbonavicius, Sandra Sakalauskaite, Rimantas Daugelavicius, Liudas Pranevicius, Martynas Lelis, Darius Milcius
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Materials Science, Multidisciplinary
Martynas Lelis, Sarunas Varnagiris, Marius Urbonavicius, Kestutis Zakarauskas
Article
Materials Science, Multidisciplinary
Lina Jataute, Valentina Krylova, Nijole Dukstiene, Martynas Lelis, Simona Tuckute
Summary: The study explores the deposition of Ag-In-Se films on commercial polyester-coated textile surface using chemical bath deposition and successive ionic layer adsorption and reaction methods. The results show that the films consist of individual agglomerates of Ag-In-Se particles formed at specific locations, with indium mostly accumulating in the top layer of the films and the optical properties indicating them to be direct band gap semiconductors with sensitive parameters to film composition.
Article
Chemistry, Physical
Valentina Krylova, Nijole Dukstiene, Martynas Lelis, Simona Tuckute
Summary: The study demonstrates that thermo-chemical treatment can effectively enhance the hydrophilicity of PES/PVC textile surfaces, and the surface modifications can be confirmed through various analytical techniques.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Marius Urbonavicius, Sarunas Varnagiris, Sandra Sakalauskaite, Emilija Demikyte, Simona Tuckute, Martynas Lelis
Summary: In this study, nanocrystalline anatase TiO2 films deposited by magnetron sputtering on high-density polystyrene (HDPE) beads were utilized as floating photocatalysts for Salmonella typhimurium bacterial inactivation in water for the first time, showing promising results. Additionally, the photocatalytic degradation of methylene blue dye in the presence of HDPE beads with TiO2 film under UV-B irradiation was investigated. Cycling experiments confirmed the suitability of adopting such floating photocatalyst structures for practical applications.
Article
Materials Science, Multidisciplinary
Sarunas Varnagiris, Marius Urbonavicius, Simona Tuckute, Martynas Lelis
Summary: In this study, Zn-rich ZnO films were formed using unconventional magnetron sputtering approach with cyclic variation of oxygen flow. The modified deposition method resulted in complex structure films with altered surface characteristics compared to regular ZnO films, leading to significant improvement in photocatalytic efficiency.
Article
Chemistry, Physical
Marius Urbonavicius, Sarunas Varnagiris, Simona Tuckute, Sandra Sakalauskaite, Emilija Demikyte, Martynas Lelis
Summary: In this study, a reactive magnetron sputtering technique was used to immobilize ZnO photocatalyst on the surface of HDPE beads for enhanced photocatalytic performance. The results showed that the ZnO photocatalyst with Ni underlayer performed better in inactivating bacterial mixtures.
Article
Chemistry, Physical
Sarunas Varnagiris, Marius Urbonavicius, Sandra Sakalauskaite, Emilija Demikyte, Simona Tuckute, Martynas Lelis
Summary: The study investigates the application of floating photocatalysts for eliminating Salmonella typhimurium in polluted water, utilizing high-density polyethylene (HDPE) beads as support for carbon-doped TiO2 films. Results show that more than 95% of the bacteria were decomposed in five consecutive treatment cycles, demonstrating the effectiveness of the proposed method on thermal-sensitive substrates. Thorough analysis of the deposited films was also conducted to confirm the suitability of the technique for forming high-quality photocatalytic active films.
Article
Chemistry, Physical
Sandra Sakalauskaite, Deimante Vasiliauske, Emilija Demikyte, Rimantas Daugelavicius, Martynas Lelis
Summary: Visible light activated TiO2 powder can partially disinfect bacteria under specific conditions, causing damage to the bacterial metabolism and leading to inactivation. Understanding the effects of light treatment on bacteria helps explore new bacterial inactivation technologies.
Article
Chemistry, Physical
Simona Tuckute, Sarunas Varnagiris, Marius Urbonavicius, Emilija Demikyte, Kristina Bockute, Martynas Lelis
Summary: ZnO is an important industrial metal oxide semiconductor. Reactive magnetron sputtering under Zn-rich conditions promotes the formation of intrinsic ZnO defects, resulting in the deposition of metallic Zn phase-rich ZnO films that exhibit superior photocatalytic efficiency compared to traditional ZnO oxide. This intentional formation of intrinsic ZnO defects can be considered advantageous self-doping. The addition of extrinsic dopants, such as copper or carbon, further modifies the microstructure of the films, with carbon having a positive effect on photocatalytic efficiency.
Article
Green & Sustainable Science & Technology
Emilija Demikyte, Sandra Sakalauskaite, Neringa Kuliesiene, Simona Tuckute, Marius Urbonavicius, Sarunas Varnagiris, Rimantas Daugelavicius, Martynas Lelis
Summary: In this study, carbon-doped TiO2 films were deposited using magnetron sputtering technique, showing enhanced visible light photocatalytic activity when formed on glass covered by a Ni layer with the formation of metastable anatase phase. The presence of the Ni underlayer had a positive effect on the efficiency of Rhodamine B solution bleaching, suggesting potential benefits for practical wastewater treatment systems. This improvement was mainly attributed to structural changes in the TiO2 crystal phase, although other mechanisms such as impurity diffusion prevention or positive Ni doping effects could also have played a role.
ENVIRONMENTAL AND CLIMATE TECHNOLOGIES
(2021)
Article
Green & Sustainable Science & Technology
Deimante Vasiliauske, Sandra Sakalauskaite, Neringa Kuliesiene, Simona Tuckute, Marius Urbonavicius, Sarunas Varnagiris, Rimantas Daugelavicius, Martynas Lelis
Summary: The study demonstrates that visible light-assisted photocatalysis, in combination with titanium dioxide, effectively inactivates Salmonella enterica bacteria and prevents its colony formation, primarily due to the production of high levels of intracellular reactive oxygen species.
ENVIRONMENTAL AND CLIMATE TECHNOLOGIES
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Martynas Lelis, Simona Tuckute, Sarunas Varnagiris, Marius Urbonavicius, Kristina Bockute, Giedrius Laukaitis
MATERIALS TODAY-PROCEEDINGS
(2020)
Article
Green & Sustainable Science & Technology
Sandra Sakalauskaite, Neringa Kuliesiene, Deimante Galalyte, Simona Tuckute, Marius Urbonavicius, Sarunas Varnagiris, Rimantas Daugelavicius, Martynas Lelis
ENVIRONMENTAL AND CLIMATE TECHNOLOGIES
(2020)
Article
Green & Sustainable Science & Technology
Neringa Kuliesiene, Sandra Sakalauskaite, Simona Tuckute, Marius Urbonavicius, Sarunas Varnagiris, Rimantas Daugelavicius, Martynas Lelis
ENVIRONMENTAL AND CLIMATE TECHNOLOGIES
(2020)
