Article
Engineering, Environmental
Siyao Cheng, Xihao Pan, Aming Xie, Jiaoyan Shi, Qian Qiu, Cheng Zhang, Wei Dong, Xiaoliang Qi
Summary: By utilizing a modified Zn/HCl system for controlled hydrogenation of transition metal oxides (TMO), the research shows a significant improvement in the electromagnetic absorption (EMA) performance of TMO. The study reveals a close relationship between EMA property and hydrogenation degree, with potential for efficient tuning through hydrogenation control. These findings suggest that enhanced EMA performance in hydrogenated TMO is attributed to changes in band structure leading to increased electrical conductivity.
CHEMICAL ENGINEERING JOURNAL
(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, Ceramics
Kyungtaek Lee, Manisha Sahu, Sugato Hajra, Kalyani Mohanta, Hoe Joon Kim
Summary: Tin oxide is a n-type semiconductor material with superior properties used in gas sensors for warning and detection of dangerous gases. The sintering temperature significantly affects the grain size and dielectric properties of tin oxide, thereby influencing gas sensing behavior. Among different sintering temperatures, 1200°C displays the best gas-sensing performance with high response and low limit of detection.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Nhat Quang Minh Tran, Michitaka Ohtaki, Koichiro Suekuni
Summary: High-temperature thermoelectric properties of tungsten-based Magne'li phase oxide (W1-xTix)18O49 (0 < x < 0.25) prepared by solid state reaction followed by densification via spark plasma sintering (SPS) were studied. The Ti substitution increased the Seebeck coefficient, the power factor, and decreased both the electronic and lattice thermal conductivity, leading to a significantly high ZT of 0.50 +/- 0.07 at 1073 K for the sample with x = 0.2.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Daishi Shiojiri, Tsutomu Iida
Summary: This study investigates the effect of the metal-insulator transition (MIT) on the thermal conductivity of microstructure-controlled Ti2O3 composites. By varying the particle radii of the conductive phases, the electronic and thermal transport properties of the material can be changed. It was found that reducing the content of the conductive phase and decreasing the particle diameter lead to an increase in the electronic thermal conductivity and total thermal conductivity of the composite, with the maximum thermal conductivity change being 6.34 times larger than that of pure Ti2O3.
CERAMICS INTERNATIONAL
(2022)
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
H. Y. Hong, D. H. Kim, K. Park
Summary: In this study, the thermoelectric properties of Bi0.97Na0.03CuSeO were systematically investigated by doping Mg2+ ions. The Mg2+ doping significantly enhanced the electrical conductivity by increasing hole concentration and reducing phonon thermal conductivity. By improving the thermoelectric power factor and reducing the thermal conductivity, the thermoelectric performance of Bi0.97Na0.03CuSeO was significantly improved.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Amanda Guenther, Hilger Lohringer, Dirk Mueller, Elmar Schmidbauer, Christa Springsklee
Summary: Impedance spectroscopy was used to distinguish between bulk and grain boundary effects on polycrystalline VO2 samples near the metal-insulator transition temperature. While there is extensive literature on the electrical properties of VO2 thin films and nanowires, there is a lack of studies separating bulk and grain boundary effects. The structure of grain boundaries in polycrystalline samples is different from that in macroscopic samples, but provides valuable information on electrical conduction. Grain boundary processes in VO2 samples could be measured at room temperature to the transition temperature, while bulk properties and grain boundary conduction could only be studied at low temperatures.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Physics, Multidisciplinary
A. L. Khomkin, A. S. Shumikhin
Summary: The study proposes a simple method for calculating the metal vapor conductivity at the critical point and vicinity, suggesting that atomic metal vapors near the critical point should be considered a gaseous metal state.
Article
Polymer Science
H. E. H. Sadek, M. F. Zawrah, F. Abd-EL-Raoof, Z. A. Abd El-Shakour, Mohammed A. Taha, R. M. Khattab
Summary: The main objective of this study was to investigate the influence of transition metal-oxides (ZnO, TiO2, Fe2O3) on the inhibition of spinel formation during cordierite fabrication and their effects on sinterability, microstructure, hardness, and electrical properties. The results showed that the addition of transition metals successfully prevented the formation of spinel and promoted the formation of cordierite. The physical, mechanical, and electrical properties were improved by increasing the concentration of metal oxides. The dielectric constant values were higher for samples containing TiO2 compared to those containing Fe2O3 and ZnO. The hardness of all samples ranged between 6.14-6.61 GPa.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Chemistry, Physical
Wided Hizi, Malek Gassoumi, Hedi Rahmouni, Ahlem Guesmi, Naoufel Ben Hamadi, Essebti Dhahri
Summary: The electrical characterization of a La0.9Sr0.1MnO3 compound sintered at different temperatures was investigated. The study revealed that the transport properties of the compound are governed by non-small-polaron-tunneling and correlated-barrier-hopping mechanisms. The thermal activation of the conduction process in the system was also confirmed. Additionally, the electrical conductivity was significantly enhanced when a DC bias was applied at room temperature.
Article
Materials Science, Ceramics
Chao Shi, Qinyuan Lai, Aoping He, Xiyong Chen, Tianquan Liang, Yuezhou Wei, Nengneng Luo
Summary: High-performance ScSZ ceramics were successfully prepared at low temperature using the cold sintering process (CSP) associated with post-heat-treatment (PHT). The relative density and electrical conductivity of the ceramics exceeded those prepared by conventional sintering methods at higher temperatures. This study demonstrates that CSP is a promising method for preparing high-performance ScSZ ceramics at reduced temperature.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xinxi Zeng, Bingcheng Luo, Han Zhang, Xiaoqing Xi, Bo Li, Ji Zhou
Summary: This paper investigates the terahertz responses of Gamma 4 in rare-earth orthoferrite GdFeO3 ceramics, manipulated using thickening and thermal methods. The study showed that with increased thickness, peak heights of both ferromagnetic resonances and antiferromagnetic resonances increased while noise was reduced. Additionally, thermal control led to a blue shift in resonant frequencies and increased peak heights for both resonances.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Applied
Makoto Tachibana, Ahmad Rifqi Muchtar, Takao Mori
Summary: This study reports the thermal conductivity and thermoelectric properties of perovskite Sr1-x (La0.5Na0.5)( x )TiO3 and Nb-doped samples. The results show that the thermal conductivity is at its minimum near the cubic-tetragonal phase boundary at x = 0.2. Nb doping increases the power factor of the x = 0.2 samples but also raises the thermal conductivity.
APPLIED PHYSICS EXPRESS
(2022)
Review
Chemistry, Physical
K. Snini, M. Akyol, M. Ellouze, L. El Mir, F. Ghribi, A. Ekicibil
Summary: The study focuses on preparing Pr0.67Ba0.22Sr0.11Mn0.975Ni0.025O3 compound and analyzing its electrical properties and metal-semiconductor transitions using impedance spectroscopy and conductivity analysis. The material is found to be suitable for high frequency energy storage devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
S. S. Lokesh Vendra, Noel Antony, Ekaterina Koroleva, Alexey Filimonov, Sergey Vakhrushev, Ravi Kumar
Summary: In this study, hafnium dioxide ceramics were successfully synthesized and their electrical properties were investigated using dielectric spectroscopy. The results demonstrate high stability and low frequency dispersion of the material.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Composites
Gayatri Vineela Marrivada, Phaneendra Kiran Chaganti, Ravindran Sujith, Bhavika Sharma
Summary: This study investigates the effect of graphene nanoplatelet addition on glass fibre triaxial braided composites and finds that adding graphene nanoplatelets can improve the mechanical properties of the composites.
ADVANCED COMPOSITE MATERIALS
(2023)
Article
Chemistry, Physical
K. V. Sai Srinivasan, Aqshat Seth, Dhammapada Mohapatra, Shreyas Ramachandran, Ravindran Sujith
Summary: This study theoretically investigated the effect of iron decoration on three defective phosphorene systems for hydrogen storage. The results showed that the Fe-decorated DV-5|8|5-1 system exhibited higher hydrogen adsorption energy, and the magnetic moment played an important role in hydrogen adsorption.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Ankit Sharma, Sujith Ravindran, Amit Kumar Gupta
Summary: Metal foams are lightweight and have high impact energy absorption ability, making them suitable for dynamic load applications. Density-graded foams have superior compressive properties compared to uniform foam, and the tri-layer functionally graded foam material (FGFM) achieved a maximum compressive strength of 142 MPa. The inclusion of B4C reinforcement in the FGFM further enhanced its energy absorption efficiency to approximately 67%.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Gangadhar Jella, Dillip K. K. Panda, Nawraj Sapkota, Michelle Greenough, Santanu P. P. Datta, Apparao M. M. Rao, Ravindran Sujith, Rajendra K. K. Bordia
Summary: Carbon-rich SiOC-I and silicon-rich SiOC-II were synthesized and their elemental and structural characteristics were evaluated. The composite anode (SiOC-II/GNP) achieved high specific capacity (744 mAh/g) and excellent cycling stability. The enhanced electrochemical performance was attributed to better electronic conductivity, lower charge-transfer resistance, and short ion diffusion length.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Jamil Eduardo Flores Gonzales, Alexander Ganzha, Maria Kniazeva, Daria Andronikova, Alexander Vakulenko, Alexei Filimonov, Andrey Rudskoy, Carsten Richter, Arvind Dasgupta, Ran Gao, Roman Burkovsky
Summary: Domain configuration in epitaxial antiferroelectric films is studied using X-ray nanoscopy, which allows extraction of domain size information beyond the beam-size limit. The study investigates how film thickness (50 and 1000 nm) and temperature (20 and 200 degrees C) affect the nanodomain configuration of PbZrO3/SrRuO3/SrTiO3 thin films. It is found that most antiferroelectric domains in both films are too small to be directly observed, but their sizes can be analyzed using diffraction peak width. The characteristic domain size is found to be independent of film thickness and around 13 nm.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Materials Science, Multidisciplinary
S. S. Lokesh Vendra, Ekaterina Koroleva, Alexey Filimonov, Sergey Vakhrushev, Ravi Kumar
Summary: This work presents a novel and economical procedure to synthesize Si(Hf)OC nanocomposites by using hafnium n tetra butoxide precursor to modify silicon oxycarbide (SiOC). X-ray diffractograms confirm the in-situ crystallization of tetragonal HfO2 in an amorphous SiOC matrix. The dielectric properties of sintered Si (Hf)OC nanocomposites are investigated at varied temperatures and frequency ranges, showing an increase in permittivity and a decrease in dielectric loss compared to sintered SiOC.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Chemistry, Physical
Ravindran Sujith, Jella Gangadhar, Michelle Greenough, Rajendra K. Bordia, Dillip K. Panda
Summary: Lithium-ion batteries (LIBs) are widely used in transportation and portable electronics, and are being considered for renewable energy storage. Silicon-based anodes have high theoretical specific capacities, but suffer from capacity fading. Silicon oxycarbide (SiOC) materials have been developed as a substitute anode material due to their versatile synthesis routes and ability to accommodate large strains. However, SiOC anodes face challenges such as low electrical conductivity and coulombic efficiencies. Techniques like nanoparticle incorporation and prelithiation have been employed to overcome these limitations. SiOC materials also show potential in other battery systems and supercapacitors.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Maria A. Kniazeva, Alexander E. Ganzha, Ran Gao, Arvind Dasgupta, Alexey Filimonov, Roman G. Burkovsky
Summary: This paper investigates the temperature-induced phase transitions and domain structure characteristics of epitaxial PbZrO3/SrRuO3/SrTiO3 heterostructures using high-resolution synchrotron x-ray diffraction. The transition order of the antiferroelectric transition changes from first to second; peculiar in-plane M-point superstructures appear at high temperatures, indicating a new phase; the R- and E-point superstructure reflections show reduced splitting compared to mechanical compatibility demands. The study discusses the energetics of reduced antiferroelectric domain tilts, its connection to observed phase transition changes, and the possible contribution of an unusual diffraction mechanism related to partial coherence between domains in a random nanodomain structure.
Article
Energy & Fuels
Pawan K. Chauhan, Venkataraman Vidhukiran, Surendran Jyothis, Ravindran Sujith
Summary: Highly porous materials with high specific surface areas are promising for hydrogen storage, but finding chemically stable adsorbents is still a challenge. Silicon oxycarbide (SiOC) ceramics, known for their chemical stability, can overcome this obstacle. Surprisingly, the addition of graphene nanoplatelets (GNP) to SiOC ceramics resulted in a lower gravimetric density. We propose a theoretical framework to explain this phenomenon and suggest that pore sizes play a crucial role in determining hydrogen uptake in these composites.
Article
Physics, Multidisciplinary
Yu Klunnikova, M. Anikeev, A. Filimonov
Summary: This study analyzed the effect of laser annealing on titanium dioxide films on sapphire substrates and optimized the film properties using a thermomechanical model. The simulation results showed that the film-to-substrate thickness ratio played a crucial role in the film properties.
ST PETERSBURG POLYTECHNIC UNIVERSITY JOURNAL-PHYSICS AND MATHEMATICS
(2022)
Article
Physics, Multidisciplinary
I. S. Tereshina, G. A. Politova, T. P. Kaminskaya, V. V. Popov, D. Gunderov, A. Filimonov, I. A. Pelevin
Summary: In this study, hard-magnetic materials were subjected to severe plastic deformation, and the nanostructure formation features were investigated before and after deformation. Differences in surface microstructure and magnetic domain configuration were observed between the initial and deformed samples. The relationship between microstructural features and magnetic domains was visualized using magnetic force microscopy.
ST PETERSBURG POLYTECHNIC UNIVERSITY JOURNAL-PHYSICS AND MATHEMATICS
(2022)
Article
Physics, Multidisciplinary
A. Filimonov, V. B. Bondarenko, Ravi Kumar
Summary: The paper investigates the high-temperature structure of a chaotic potential induced by charged dislocations in heterojunctions of group III nitrides, and takes into account the spatial dispersion of the dielectric response of a two-dimensional electron gas.
ST PETERSBURG POLYTECHNIC UNIVERSITY JOURNAL-PHYSICS AND MATHEMATICS
(2022)
Article
Materials Science, Multidisciplinary
Roman G. Burkovsky, Georgiy A. Lityagin, Alexander E. Ganzha, Alexander F. Vakulenko, Ran Gao, Arvind Dasgupta, Bin Xu, Alexey Filimonov, Lane W. Martin
Summary: Research on epitaxial antiferroelectric materials show that PbZrO3/SrRuO3/SrTiO3 heterostructures exhibit an unusual structural response to electric fields lower than the switching threshold, gradually forming a ferroelectric-like structure. The field-induced structure is similar to the parent antiferroelectric phase in octahedral-tilt pattern but differs in lead-ion displacement. The findings suggest a potential mechanism for smearing of polarization-field loops in such heterostructures.
Article
Materials Science, Multidisciplinary
Maria A. Kniazeva, Alexander E. Ganzha, Irena Jankowska-Sumara, Marek Pasciak, Andrzej Majchrowski, Alexey Filimonov, Andrey Rudskoy, Krystian Roleder, Roman G. Burkovsky
Summary: The Perovskite solid solutions PbHfO3-PbSnO3 were studied to understand the formation mechanisms of incommensurate phases. The study used x-ray diffuse scattering signal to quantify the evolution of susceptibilities related to different distortion modes. The experimental results showed a linear dependence of ferroelectric stiffness in the cubic phase and a shift in the susceptibility maximum to a nonzero wave vector in the intermediate phase.