Article
Chemistry, Physical
N. A. Zhuk, N. A. Sekushin, V. G. Semenov, A. Fedorova, A. A. Selyutin, M. G. Krzhizhanovskaya, V. P. Lutoev, B. A. Makeev, V. V. Kharton, D. N. Sivkov, A. D. Shpynova
Summary: The pyrochlore compound Bi2FeTa2O9.5 was synthesized by solid-phase synthesis. Electron spin resonance (ESR) and Mossbauer spectroscopy were used to investigate the electronic state and local environment of iron atoms. The compound exhibited dielectric properties, and its electrical properties were studied in a wide temperature and frequency range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Hafedh Belmabrouk, Mohammed A. Albedah, Rahma Ayed Brahem, Safwen Elkossi, Anouar Jbeli, Marwa Selmi
Summary: This paper investigates a new ceramic material with a BaTiO3-like structure, focusing on its synthesis, structure, and dielectric characteristics. The material was synthesized using the solid-state method and was found to have a cubic structure with the space group Pm-3m, as confirmed by X-ray diffraction analysis. The sample's crystalline and grain size were estimated to be approximately 147 nm and 1.43 μm, respectively, using Debye Scherrer's formula and SEM. The electrical conductivity data (AC) adhered well to Jonscher's power law, specifically the barrier hopping model (CBH). The DC conductivity revealed thermally activated conduction and semiconductor behavior. As the frequency increased, the dielectric permittivity (ε) decreased, which can be explained by Maxwell-Wagner's theory of interfacial polarization. Complex impedance spectra indicated the presence of a non-Debye relaxation phenomenon. Electrical modulus measurements revealed a thermally activated relaxation attributed to the Maxwell-Wagner (M-W) space charge relaxation phenomenon, with an activation energy (Ea) of approximately 0.623 eV.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jakkree Boonlakhorn, Jirata Prachamon, Jutapol Jumpatam, Sriprajak Krongsuk, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: By doping CdF2, the dielectric properties of the CaCu3Ti4O12/CaTiO3 binary-phase system can be improved. With increasing dopant concentration, the grain size decreases, the dielectric permittivity increases, and the loss tangent decreases. Impedance spectroscopy findings suggest that the tremendous dielectric response in this binary-phase system is due to an internal barrier layer capacitor.
RESULTS IN PHYSICS
(2022)
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
L. V. Rychkova, N. A. Sekushin, S. V. Nekipelov, B. A. Makeev, A. V. Fedorova, R. I. Korolev, N. A. Zhuk
Summary: Two series of pyrochlore-structured solid solutions, Bi2Mg1-xCoxNb2O9 and Bi2MgNb2-2xCo2xO9-8, were synthesized. The study showed the formation of solid solutions and fixed foreign phases in the samples, with cobalt atoms mainly in the charge state of Co(II) in monomers and exchange-bound clusters with antiferromagnetic exchanges. The ceramics exhibited high dielectric permeability, low dielectric losses, and potential applications in multilayer ceramic capacitors.
CERAMICS INTERNATIONAL
(2021)
Article
Computer Science, Information Systems
Jurgen K. A. Nogueira, Joao G. D. Oliveira, Samuel B. Paiva, Valdemir P. Silva Neto, Adaildo G. D'Assuncao
Summary: A sensor is proposed to characterize the complex permittivity of dielectric materials in a non-destructive and non-invasive way. The sensor is based on a rectangular patch microstrip two-port circuit with a complementary split-ring resonator (CSRR) element. The sensitivity analysis is determined by varying the permittivity of the material under test (MUT). The proposed sensor is simulated and analyzed using Ansoft HFSS software, and the results show good agreement with measurements made on two different dielectric material samples with known complex permittivity values.
Article
Chemistry, Physical
K. S. Ashraff Ali, M. M. Ravikumar, J. Mohammed, Naeim Farouk, V. Mohanavel, M. Ravichandran
Summary: This study reported the microwave absorption properties of BaFe12O19, carbon fiber@Fe3O4 composite, and graphene@BaFe12O19@Fe3O4 composite, and their effects on the microwave absorption performance. Increasing filler loading in different combinations can enhance microwave absorption capabilities within a certain range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jiangtao Fan, Zhen Long, Haitao Zhou, Gang He, Zhanggui Hu
Summary: (Tm+Nb) co-doped TiO2 ceramics were prepared and their phase, microstructure, and dielectric properties were investigated. The ceramics with a co-doping concentration of 0.01 exhibited ultralow dielectric loss and colossal permittivity, showing excellent temperature and frequency stability in a certain range. The dielectric properties of the ceramics were influenced by several factors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Jakkree Boonlakhorn, Jutapol Jumpatam, Punpatsorn Suksangrat, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: The dielectric response of a novel giant dielectric ceramic, Na1/3Ca1/3La1/3Cu3Ti4O12, with good dielectric and electrical properties was investigated. This perovskite-like ceramic was synthesized using a sol-gel method and exhibited large dielectric permittivities and low dielectric loss tangent values. Na+ substituted the Cu2+ sites, while La3+ likely occupied Ca2+ sites. The presence of an oxygen vacancy in the lattice resulted in generation of Cu+ and Ti3+, which caused the giant dielectric behavior of these materials through the IBLC phenomenon and small polaron hopping.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Biochemistry & Molecular Biology
Theeranuch Nachaithong, Narong Chanlek, Pairot Moontragoon, Prasit Thongbai
Summary: (Co, Nb) co-doped rutile TiO2 nanoparticles were prepared with low dopant concentrations, exhibiting high dielectric permittivity and low loss tangent. Impedance spectroscopy revealed that the ceramics are electrically heterogeneous, with interfacial polarization at internal insulating layers contributing to the low loss tangent.
Article
Materials Science, Ceramics
Jakkree Boonlakhorn, Punpatsorn Suksangrat, Narong Chanlek, Weerachai Sarakorn, Sriprajak Krongsuk, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: A giant dielectric ceramic material, Na1/2Sm1/2Cu3Ti4O12, was successfully prepared by a modified sol-gel method. It showed a body-centered cubic structure with charge compensation between Na and Sm ions. At a high sintering temperature, it exhibited a large dielectric constant, low dielectric loss tangent, and nonlinear properties originated from the movement of Cu+ and Ti3+ charges.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Jakkree Boonlakhorn, Narong Chanlek, Sriprajak Krongsuk, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: In this study, CaCu3-xMgxTi4O12 ceramics were successfully prepared via a chemical combustion method. Mg-doped CaCu3Ti4O12 ceramics exhibited high dielectric permittivities and low loss tangents. The enhanced dielectric properties in the doped ceramics were attributed to an enhanced grain boundary response. First-principles calculations revealed the interaction between Mg atoms and the suppression of oxygen loss during the sintering process in CaCu2.90Mg0.10Ti4O12 ceramics, resulting in an increased grain boundary resistance. The internal barrier layer capacitor (IBLC) model was found to be the primary origin of the colossal dielectric response in all CaCu3-xMgxTi4O12 ceramics studied.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Analytical
Nan Zhang, Bin Jiang, Shanshan Xue, Xiaolong Wang, Tianshuang Wang, Peng Sun, Geyu Lu
Summary: In this study, a novel analysis method based on variation of energy loss was proposed for the first time, and a microwave gas sensor for NH3 detection was successfully developed. The sensor showed a low detection limit, excellent selectivity, humidity-resistance, and good linearity for NH3 concentration.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Georgios Kargas, Nikolaos Ntoulas, Andreas Tsapatsouli
Summary: The irrigation of green roofs with recycled or saline water can help save valuable drinking water. Monitoring the substrate electrical conductivity (ECsw) is crucial for the sustainable growth of plants on green roofs. This study estimated the ECsw of an extensive green roof substrate using the WET-2 dielectric sensor. The use of the salinity index method reliably predicted the ECsw up to 10-11 dS m(-1), but overestimated it at very low electrical conductivity levels.
Article
Materials Science, Ceramics
Porntip Siriya, Narong Chanlek, Pornjuk Srepusharawoot, Viyada Harnchana, Prasit Thongbai
Summary: A triple-doped (Ga1/2Nb1/2)(0.1)Ti0.9O2 ceramic with acceptor-donor co-doping of Al3+ exhibits improved giant dielectric properties. The ceramic shows homogeneous dispersion of all dopants inside the grains and partially segregated dispersion of Ga3+ along the grain boundaries. The improved dielectric properties are attributed to internal and surface barrier-layer capacitor effects produced by the Ga3+ and Al3+ dopants, respectively, and semiconducting grains resulting from Nb5+ doping ions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
K. Denisova, A. Shlyakhtina, O. Yumashev, M. Avdeev, M. Abdel-Hafiez, O. Volkova, A. Vasiliev
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Ceramics
Konstantin S. Gavrichev, Anna V. Shlyakhtina, Andrey V. Khoroshilov, Alexander V. Tyurin, Artem A. Ashmarin, Elena Yu. Konysheva
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2019)
Article
Chemistry, Analytical
Rustam R. Guliev, Anastasiia Y. Suntsova, Tatiana Y. Vostrikova, Alexander N. Shchegolikhin, Dmitry A. Popov, Marina A. Guseva, Alexei B. Shevelev, Ilya N. Kurochkin
ANALYTICAL CHEMISTRY
(2020)
Article
Materials Science, Multidisciplinary
A. V. Shlyakhtina, G. A. Vorobieva, A. N. Shchegolikhin, A. V. Leonov, I. V. Kolbanev, A. N. Streletskii
INORGANIC MATERIALS
(2020)
Article
Oncology
Artem A. Artykov, Dmitry A. Belov, Victoria O. Shipunova, Daria B. Trushina, Sergey M. Deyev, Dmitry A. Dolgikh, Mikhail P. Kirpichnikov, Marine E. Gasparian
Article
Materials Science, Ceramics
A. Shlyakhtina, N. Lyskov, A. N. Shchegolikhin, S. A. Chernyak, A. Knotko, I. Kolbanev, L. G. Shcherbakova
CERAMICS INTERNATIONAL
(2020)
Article
Biochemistry & Molecular Biology
Alexandra Vasilyeva, Lyubov Yurina, Alexander Shchegolikhin, Maria Indeykina, Anna Bugrova, Alexey Kononikhin, Eugene Nikolaev, Mark Rosenfeld
Article
Chemistry, Physical
A. V. Shlyakhtina, N. V. Lyskov, I. V. Kolbanev, A. N. Shchegolikhin, O. K. Karyagina, L. G. Shcherbakova
Summary: The study focused on the structure and proton conductivity of rhombohedral La6-xMoO12-delta (x = 0.5, 0.6, 0.7, 1) lanthanum molybdates produced by mechanical activation and thermal annealing. It was found that an increase in molybdenum concentration in the La6-xMoO12-delta series led to a decrease in both rhombohedral distortion and proton conductivity. The optimal composition of La6-xMoO12-delta (x = 0.5) exhibited a proton conductivity of approximately 4.0 x 10(-5) S/cm at 500 degrees C in wet air.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Inna Klimenko, Elena A. Trusova, Alexander N. Shchegolikhin, Anton Lobanov, Lubov Jurina
Summary: The study utilized the unique physical properties of graphene to stabilize the AlClPc complex and prevent its agglomeration, while also developing a sonochemical method for preparing stable suspensions of oxygen-free graphene. By employing molecular design techniques, hybrid structures based on AlClPc and graphene were successfully synthesized, leading to new possibilities for drug delivery and early diagnosis platforms.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Alexandra V. Galeeva, Dmitry A. Belov, Aleksei S. Kazakov, Anton V. Ikonnikov, Alexey I. Artamkin, Ludmila I. Ryabova, Valentine V. Volobuev, Gunther Springholz, Sergey N. Danilov, Dmitry R. Khokhlov
Summary: The study reveals that in Pb1-xSnxTe films with the composition range of x = (0.11-0.44) and (111) surface crystallographic orientation, a photoelectromagnetic effect is induced by laser terahertz radiation. The amplitude of the effect is determined by different factors in the trivial phase and the topological phase, with potential mechanisms involving the thermalization rate of photoexcited electrons.
Review
Biochemistry & Molecular Biology
Vladislav Sadykov, Elena Pikalova, Ekaterina Sadovskaya, Anna Shlyakhtina, Elena Filonova, Nikita Eremeev
Summary: Oxygen and hydrogen mobility are important characteristics for the operation of electrochemical devices, and this work focuses on studying the diffusion of mixed ionic-electronic conducting materials and its role in device performance. The main laws of bulk diffusion and surface exchange are highlighted, and isotope exchange techniques are used to study these processes in detail. Ionic transport properties of various conventional and state-of-the-art materials are reviewed.
Article
Chemistry, Multidisciplinary
Elena A. Trusova, Inna V. Klimenko, Asya M. Afzal, Alexander N. Shchegolikhin, Lyubov V. Jurina
Summary: The study focuses on the formation of graphene suspension in DMF and its mixture with aqua molecules under ultrasonic irradiation. The presence of aqua molecules leads to the predominant formation of 3D graphene sheets with larger linear dimensions. Characterization techniques like TEM, DLS, FTIR, Raman spectroscopy, and UV-Vis spectroscopy were used to analyze the graphene suspensions.
NEW JOURNAL OF CHEMISTRY
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Alexandra Galeeva, Aleksei S. Kazakov, Anton Ikonnikov, Aleksei Artamkin, Dmitry A. Belov, Ludmila Ryabova, Valentine V. Volobuev, Gunther Springholz, Sergey N. Danilov, Dmitry R. Khokhlov
2020 45TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)
(2020)
Article
Physics, Condensed Matter
O. A. Streletskii, I. A. Zavidovskii, O. Yu. Nishchak, A. N. Shchegolikhin, N. F. Savchenko
PHYSICS OF THE SOLID STATE
(2020)
Article
Neurosciences
Yu. V. Ukraintseva, A. A. Polishchuk, K. M. Liaukovich, K. A. Saltykov, M. Meira e Cruz, D. A. Belov, A. N. Nizhnik
ZHURNAL VYSSHEI NERVNOI DEYATELNOSTI IMENI I P PAVLOVA
(2019)