Article
Chemistry, Physical
Zeynep Orhan, Sakir Aydogan, Hulya Ozturk Dogan
Summary: In this study, cobalt chromite/electro-reduced graphene oxide (CCO/ERGO) nanocomposites were fabricated on nickel foam electrode by a two-step synthesis method. The analytical and morphological structure of the CCO/ERGO nanocomposite was characterized using various techniques. The CCO/ERGO nanocomposite exhibited high specific capacitance and showed potential for future-generation supercapacitors applications.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Semiramis Gulkesen, Kutluhan Utku Tumen, Mustafa Akyol, Ahmet Ekicibil
Summary: In this study, a series of Co(Cr1-xFex)(2)O-4 compounds were synthesized by sol-gel method, and it was found that magnetic and magnetocaloric properties were significantly altered when Fe ions partially replaced Cr ions in CoCr2O4. After 50% Fe substitution, the material exhibited higher magnetic transition temperature and magnetic entropy change values, making it a potential candidate for magnetic refrigerant applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Physics, Applied
Yuliang Xu, Xiansong Liu, Xucai Kan, Shuangjiu Feng, Wei Wang, Chaocheng Liu, Yong Li
Summary: Zn-substituted CoCr2O4 spinel powders were prepared by solid-state reaction method, and the crystal structure and magnetic properties were studied. With the increase of zinc content, the position of the main peak in XRD pattern changed and the grain size and lattice parameters also changed. The magnetic properties showed a decrease in saturation magnetization and coercivity.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Chemistry, Physical
Jesus Gonzalez-Cobos, Brice Mylonoyannis, Guangtao Chai, Weidong Zhang, Chengcheng Tian, Akim Kaddouri, Sonia Gil
Summary: Un-supported spinel-type cobalt chromite catalysts were synthesized by propionic acid-mediated sol-gel method and evaluated for toluene oxidation. The Co and Cr content and the preparation conditions were found to significantly affect the physico-chemical, surface and catalytic properties. Co-rich CoCr2O4 catalyst showed the highest activity due to the formation of a single CoCr2O4 spinel phase, favorable surface composition, and higher low-temperature reducibility. Surface Cr6+ ions and adsorbed oxygens were found to play an important role in toluene oxidation reaction.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Engineering, Electrical & Electronic
Bin Chen, Jiansong Feng, Qianling Chen, Songhua Xiao, Jing Yang, Xu Zhang, Zhibin Li, Taihong Wang
Summary: This study investigates the effect of chemical configuration of transition metal chloride anions on the thermoelectric properties of polymer composite inorganic electrolyte aqueous flexible electronic devices. The results demonstrate that [CuCl4]2- anions, enhanced by carboxylated cellulose, can significantly enhance the thermally generated voltage, which is of great importance for designing high-quality ionic thermoelectric materials.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Chemistry, Physical
Iliana N. Apostolova, Angel T. Apostolov, Julia M. Wesselinowa
Summary: Using a microscopic model, the properties of pure and ion doped CoCr2O4 - bulk and NPs were studied. It was found that the magnetization and Curie temperature decrease with decreasing particle size, and different effects were observed with Fe and Mg doping due to the different strains caused by doping ions. The polarization increases with increasing Fe doping concentration, and anomalies in specific heat were observed at specific temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Suresh Ghotekar, Dnyaneshwar Sanap, Kun-Yi Andrew Lin, Hitler Louis, Dattaprasad Pore, Rajeshwari Oza
Summary: First-time cobalt chromite nanoparticles were synthesized using honey as a natural precursor through a bio-derived approach. The as-synthesized nanoparticles exhibited a cuboidal topology with an average size of 31.69 nm. These nanoparticles were used as a catalyst for the facile formation of 5-aryl-[1,2,4]-triazolidine-3-thiones. The study highlights the potential of synthesize cobalt chromite nanoparticles using a green approach in nanochemistry research.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Chemistry, Physical
Firuta Goga, Rares Adrian Bortnic, Alexandra Avram, Mioara Zagrai, Lucian Barbu Tudoran, Raluca Anca Mereu
Summary: The structural, morphological, and optical properties of Ni2+ ions substitution in CoCr2O4 matrix as ceramic pigments were investigated. The study revealed that the color of the pigments changed with the substitution of Ni2+ ions, showing good stability and coloring properties in ceramic tile glazes.
Article
Environmental Sciences
Weiqing Ning, Yuan Li, Yu Fang, Fang Li, Reza Pournajaf, Bejan Hamawandi
Summary: CoCr2O4 nanoparticles and their composites with g-C3N4 were synthesized and characterized. The composite samples showed higher photocatalytic activities than the pure CoCr2O4 sample, and complete degradation of methylene blue dye was achieved within 80 minutes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Ceramics
N. A. Noshahi, K. Nadeem, M. Kamran
Summary: The study of Mn doped Nickel Chromite nanoparticles reveals the impact of Mn doping on the magnetic and structural properties of the NPs. The morphology and magnetic properties of the NPs are both influenced by the Mn doping.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
S. Goswami, P. Gupta, S. Bedanta, M. Chakraborty, D. De
Summary: This article reports exchange bias (EB) and memory effect in nanocrystalline CoCr2O4, with results showing that these effects are caused by inherent magnetic inhomogeneity rather than surface effects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Mohammad Almasi Kashi, Kamran Heydaryan
Summary: The use of different surfactants in the synthesis of cobalt ferrite nanoparticles has been shown to significantly impact their magnetic properties, particularly their suitability for magnetic hyperthermia applications. The presence of surfactants reduces the size of the nanoparticles and enhances their superparamagnetic contribution, making them more effective for hyperthermia treatments. Among the surfactants tested, the use of polyvinylpyrrolidone (PVP) resulted in the highest specific absorption rate (SAR) value, indicating superior magnetic heating capabilities.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Bao-hu Xi, Yan Jin, Mao-qiang Wei, Zhen-chao Zhang, Yu-hui Hou, Bai-cheng Feng
Summary: Spinel chromite nanocatalysts were prepared and used for the N-oxidation of 2,6-diamino-4-chloropyrimidine, resulting in a series of 4-substituted diaminopyrimidine oxides. Among them, CoCr2O4 exhibited excellent catalytic activity and recyclability.
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Jianqi Liu, Xiang Ren, Zhengdong Zhang, Nan Sun, Honglin Tan, Jinming Cai
Summary: The research demonstrates that doping manganese on the surface of CoCr2O4 can enhance the catalytic activity of denitration, with NH3 dehydrogenation being the rate-determining step and the activation barrier reduced under aerobic conditions. NO2 can undergo a fast selective catalytic reduction process. Manganese plays a positive role in catalytic reactions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
K. Laajimi, F. Ayadi, M. Kchaw, I Fourati, M. Khlifi, M. H. Gazzah, J. Dhahri, J. Juraszek
Summary: The influence of strontium doping on the structural, magnetic, and magnetocaloric properties of La-based complex oxides has been investigated. Different crystal structures were observed for samples with varying doping concentrations. The magnetic entropy change measurements showed that strontium doping significantly affects the magnetic properties of the material, making it a potential candidate for magnetic refrigeration applications.
SOLID STATE SCIENCES
(2021)
Article
Physics, Condensed Matter
Artem V. Pronin, Martin Dressel
Summary: Nodal semimetals exhibit unique electronic band topology related to 3D bulk states, leading to diverse electronic properties that can be experimentally accessed through optical measurements.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Physics, Multidisciplinary
S. Polatkan, M. O. Goerbig, J. Wyzula, R. Kemmler, L. Z. Maulana, B. A. Piot, I Crassee, A. Akrap, C. Shekhar, C. Felser, M. Dressel, A. Pronin, M. Orlita
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Vasily G. Artemov, Ece Uykur, Seulki Roh, Artem Pronin, Henni Ouerdane, Martin Dressel
SCIENTIFIC REPORTS
(2020)
Article
Materials Science, Multidisciplinary
Vladislav Bilyk, Elena Mishina, Natalia Sherstyuk, Alexander Bush, Andrey Ovchinnikov, Mikhail Agranat
Summary: The dynamic polarization switching induced by a nearly single-cycle terahertz pulse in a classical ferroelectric silicon-doped lead germanate single crystal is studied, showing a strong nonlinear response and polarization modulations. The explanation lies in the dynamic change in the ferroelectric order parameter, with numerical solutions of the Landau-Khalatnikov equation supporting the experimental results, including post-THz pulse oscillations indicative of phonon mode excitation.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Anastasia E. Sleptsova, Liudmila N. Alyabyeva, Evgeny A. Gorbachev, Ekaterina S. Kozlyakova, Maxim A. Karpov, Chen Xinming, Alexander V. Vasiliev, Boris P. Gorshunov, Anatoly S. Prokhorov, Pavel E. Kazin, Lev A. Trusov
Summary: Single-domain particles of SrFe8Al4O19 were prepared by thermal treatment of porous products of citrate-nitrate auto combustion at 1200 degrees C, and the effect of synthesis time on the particle morphology and magnetic properties was estimated. The procedure allows one to obtain SrFe8Al4O19 particles with mean diameters of 100-460 nm and coercivity ranges from 14.5 to 18.4 kOe, while ferromagnetic resonance frequencies vary from 149 to 164 GHz.
MENDELEEV COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Alexandr Bush, Vladislav Kozlov, Alexandr Stepanov, Vladimir Sirotinkin
Summary: Ceramic samples of the (1-x)Ba(Ti0.50Sn0.50)O-3•xPbTiO(3) system were synthesized by solid-state reaction. The samples exhibit solid solutions with perovskite structure throughout the composition range, with symmetry changing from cubic to tetragonal with increasing PbTiO3 content. Different dielectric responses are observed depending on the PbTiO3 content, transitioning from relaxor ferroelectric to ferroelectric-like with a diffuse phase transition, and finally to usual ferroelectric response.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
L. N. Alyabyeva, A. S. Prokhorov, D. A. Vinnik, V. B. Anzin, A. G. Ahmed, A. Mikheykin, P. Bednyakov, C. Kadlec, F. Kadlec, E. de Prado, J. Prokleska, P. Proschek, S. Kamba, A. Pronin, M. Dressel, V. A. Abalmasov, V. V. Dremov, S. Schmid, M. Savinov, P. Lunkenheimer, B. P. Gorshunov
Summary: Hexaferrites are garnering more attention for developing electronic components in next-generation communication systems due to their exceptional dielectric and magnetic properties. Lead-substituted barium hexaferrite was studied to explore its electromagnetic properties, revealing a range of physical phenomena and a ferroelectric-like terahertz excitation. The discovered radio-frequency relaxations and gigahertz resonances in the material provide valuable information for manufacturing electronic devices for the terahertz range.
NPG ASIA MATERIALS
(2021)
Article
Crystallography
A. Y. Serovaiskii, V. G. Kutcherov, V. A. Vinokurov, A. Chernoutsan, S. G. Serebryakov, A. A. Bush, V. Kozlov, E. A. Tishchenko, A. S. Sigov
Summary: Orthorhombic lithium cuprate LiCu2O2 was subjected to high temperature and pressure, resulting in a tetragonal symmetry and linear dependence of resistivity in the temperature range of 77-296 K, indicating a variable length hopping mechanism of conduction between nearest neighbors in the treated samples.
CRYSTALLOGRAPHY REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Mikhail Talanov, Alexander A. Bush, Vladimir P. Sirotinkin, Vladislav Kozlov
Summary: This study reveals a new structural mechanism of phase transition diffusion in ferroelectrics, which is associated with the enhanced broadening of the ferroelectric phase transition. The results show that the interaction of atomic displacements of A and B cations can lead to the enhancement of ferroelectric properties in the crossover region at a specific concentration.
Article
Chemistry, Physical
Mikhail V. Talanov, Adam I. Stash, Sergey A. Ivanov, Elena S. Zhukova, Boris P. Gorshunov, Boris M. Nekrasov, Vasily S. Stolyarov, Vladislav I. Kozlov, Maxim Savinov, Alexander A. Bush
Summary: This study used high-precision X-ray diffraction to observe the displacement disorder of Mn cations in STO lattice and found that, near the temperature of the antiferrodistortive transition, the off-center Mn position splits into two, providing an uneven potential barrier distribution for local atomic hopping. Additionally, by analyzing the dielectric response, two relaxation processes with similar activation energies and attempt frequencies were identified, indicating similar dielectric relaxation mechanisms.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Samuel W. Pinnock, Seulki Roh, Tobias Biesner, Artem V. Pronin, Martin Dressel
Summary: In this article, we demonstrated the effective generation of vortex terahertz (THz) beams with angular momenta P = +/- 1 and P = +/- 2 using 3-D printed spiral phase plates (SPPs). The generation of vortex beams was confirmed through frequency-domain transmission spectroscopy. The topological charge P of the vortex beams was determined using phase-sensitive Mach-Zehnder interferometry, and the resulting interference patterns supported the expected intensity distributions for the given P, providing strong evidence for the spatial phase structure of the generated THz vortex beams.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Crystallography
Vladimir Sirotinkin, Alexandr Bush, Vladislav Kozlov
Summary: The xBa(Ti(1-y)Zry)O-3-(1-x)PbTiO3 ceramic samples with various compositions were successfully synthesized by solid state reaction. XRD and Rietveld method were used to analyze their crystallographic data, and it was found that all the samples were solid solutions with tetragonal perovskite structure. The degree of tetragonal distortion decreased with increasing Zr content. Microstructure analysis revealed that the broadening of diffraction peaks on the XRD patterns was caused by both strains and small crystallite sizes.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS
(2023)
Article
Physics, Condensed Matter
Alexander Bush, Anton Matasov, Victor Andrianov, Vladislav Kozlov
Summary: Ceramic samples of CuCrO2 phase with a delafossite structure were synthesized and characterized. The threshold electric field switching effect from a high-resistivity to a low-resistivity state was observed under specific temperature and electric field conditions, which can be explained by the polaron conduction mechanism.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
T. A. Ageeva, A. A. Bush, D. V. Golubev, A. S. Gorshkova, R. N. Mozhchil, O. I. Koifman, V. S. Kozlov, M. E. Matis, V. D. Rumyantseva, A. S. Sigov, V. V. Fomichev
Summary: This paper presents the results of a systematic study on the search for organometallic molecules with a large dipole moment, and their application in the creation of new film electret materials. The compounds were synthesized and identified, and their properties were evaluated using physicochemical methods and quantum chemical calculations. The inclusion of these compounds in polyvinyl acetate films and the deposition of copper layers resulted in pronounced electret effects.
RUSSIAN CHEMICAL BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
L. Z. Maulana, Z. Li, E. Uykur, K. Manna, S. Polatkan, C. Felser, M. Dressel, A. Pronin
Summary: The optical conductivity study of multifold semimetal PdGa reveals the contributions of free carriers and interband transitions at different frequencies, with only the intraband part changing with temperature. The computation based on band structure reproduces the features of interband conductivity and predicts its linear-in-frequency behavior.
