Article
Materials Science, Multidisciplinary
Rittwick Mondal, Dipankar Biswas, Sweta Paul, Anindya Sundar Das, Chiranjib Chakrabarti, Debasish Roy, Subhratanu Bhattacharya, Soumyajyoti Kabi
Summary: The study investigates the impact of sulphur content on the structural, linear, and non-linear optical properties, as well as dielectric behavior of amorphous chalcogenide glassy materials. The incorporation of sulphur was found to increase the bandgap energy and affect various optical parameters. Analysis using topological concept revealed correlations between mean coordination numbers and obtained parameters, while the study showed that the conductivity relaxation process is non-Debye type.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Vsevolod D. Dergachev, Daria D. Nakritskaia, Sergey A. Varganov
Summary: This study investigates the accuracy of perturbation estimates of spin-orbit coupling (SOC) in lanthanide-based single-molecule magnets (SMMs) by variational solving of the Dirac equation. The results show that spin relaxation in these SMMs is influenced by the interplay between strong SOC and dynamic electron correlation.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Lingjie Duan, Junsheng Duan, Ming Li
Summary: In this paper, a new relaxation model was proposed by expressing the relaxation function in the time domain in terms of the Mittag-Leffler functions. The proposed model represents a group of non-Debye relaxation phenomena and shows a transition between the CC and the KWW models. The relaxation properties described by the new model are analyzed.
Article
Engineering, Electrical & Electronic
Hosam M. Gomaa, H. A. Saudi, I. S. Yahia, H. Y. Zahran
Summary: Sodium borate glass doped with cerium oxide improves its properties. Increasing the content of CeO2 in the glass results in improved stability, dielectric constant, and optical transparency. The glass containing 10 wt% CeO2 shows the best performance in photon shielding, and cerium-rich glass exhibits the highest resistance to gamma rays and fast neutrons.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Songlin Pu, Pinyang Fang, Li Xu, Feifei Guo, Zengzhe Xi
Summary: The dielectric relaxation behavior and conductivity of Sr1-x(LiCe)(x/2.5)Bi2Nb2O9 ceramics prepared by conventional solid-sate reaction method were investigated. The introduction of (LiCe) significantly improved the conductivity, and a large conductivity at high temperature (approximately 10-4 S·cm(-1) at 530 degrees C) could be achieved. A phase transition from normal ferroelectric to relaxor-like ferroelectric was observed in the Sr1-x(LiCe)(x/2.5)Bi2Nb2O9 ceramics. Complex impedance analysis results indicated that the concentration of charge carriers gradually increased with the increase in (LiCe). Activation energy calculations confirmed that oxygen vacancies were responsible for the conductivity at high temperature. The dielectric relaxation behavior at high temperature was attributed to the short-range conductivity of oxygen vacancies under thermal stimulation.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Biochemistry & Molecular Biology
Mikhail S. Kuklin, Antti J. Karttunen
Summary: Binary zinc(II) oxide and copper(II) oxide are commonly used in various applications, but there are no reported crystal structures for ternary Cu-Zn-O oxides. In this study, the structural characteristics and thermodynamics of Cu(x)Zn(y)O(z) ternary oxides were investigated using crystal structure prediction and quantum chemical methods. The results demonstrate that the magnetic Cu2Zn2O4 system is the most thermodynamically favorable, although the most favorable ternary crystal structure is still slightly higher in Gibbs free energy compared to experimental binary phases. The materials predicted in this study are indirect band gap semiconductors.
Review
Chemistry, Inorganic & Nuclear
Qingyun Wan, Masanori Wakizaka, Masahiro Yamashita
Summary: This article provides an overview of single-ion magnetism in lanthanide(III)-based coordination frameworks, which consist of self-assemblies in one-, two-, and three-dimensions. Lanthanide(III) ions with their large magnetic moments and magnetic anisotropy are potential candidates for SIMs/SMMs. The multi-functionalities of the coordination framework structure, such as responsiveness to external stimuli, proton conduction, high structural stability, and host-guest interactions, make lanthanide(III)-based magnetic metal coordination frameworks an exciting platform for the development of a new generation of SIMs/SMMs.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Yan Yu, Bin Huang, Yan Zhao, Yunfeng Zhao, Lina Dai, Zhijie Zhang, Hua-Feng Fei
Summary: Polysiloxane-based dielectric elastomers have great potential as electroactive soft materials, but their low permittivity has hindered practical applications. This study demonstrates that introducing cyanosilicone oil into the elastomer matrix can significantly increase the permittivity and enhance the dielectric relaxation processes. The resulting elastomer composites exhibit lower Young's modulus and dielectric loss.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Semen E. Lapuk, Marina A. Ponomareva, Andrey Galukhin, Timur A. Mukhametzyanov, Christoph Schick, Alexander Gerasimov
Summary: This study investigated the stability and kinetic parameters of glassy materials, focusing on the dynamic properties of polyvinylpyrrolidone polymer used in the pharmaceutical industry. The results can be utilized for optimizing the processing of polymer-based glassy materials and their applications in various technological fields.
Article
Materials Science, Multidisciplinary
G. Essalah, H. Guermazi, S. Guermazi, G. Leroy, B. Duponchel, M. Mascot, Ch Poupin, A. Rao, S. Mangavati
Summary: In this study, composites were synthesized using (1-x) ZnO/xNb(2)O(5) mixture by the solid-state method. The formation of the composites depended on the percentage of Nb2O5. The dielectric and electric properties of the composites were investigated, and it was found that the composites exhibited different dielectric behavior depending on the composition. The study also discovered the magnetic properties of the composites.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Danian Liu, Jingwen Wang, Wenhai Peng, Xinzhu Wang, Hua Ren, Donald W. Kirk
Summary: A semiconductor polyaniline in situ modified rGO nanosheets were proposed to maintain a stable dielectric constant at high frequencies. The pi-pi interface interaction blocked the migration of electrons, resulting in a reduction in relaxation time and a stable dielectric constant. This mechanism has great potential for various high-frequency devices.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Dawid Marcinkowski, Maciej Kubicki, Violetta Patroniak, Tadeusz Muziol, Szymon Chorazy, Le Shi, Mikolaj Zychowicz, Anna M. Majcher-Fitas, Robert Podgajny, Adam Gorczynski
Summary: This study demonstrates for the first time how the triphenylmethane (trityl) group can be used in the field of molecular magnetic materials by shaping the properties of single molecule magnets (SMMs) within lanthanide complexes. Trityl-appended hydrazone ligands were synthesized and complexed with Dy(III) and Er(III) salts to generate monometallic and bimetallic complexes. The magnetic properties of these complexes were investigated, revealing the ability of ligand HL1 to induce SMM behavior in Dy(III) congeners.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Crystallography
Valeriy Kalytka, Ali Mekhtiyev, Yelena Neshina, Aliya Alkina, Raushan Aimagambetova, Gabit Mukhambetov, Aleksandr Bashirov, Dmitriy Afanasyev, Arkadiy Bilichenko, Dinara Zhumagulova, Zukhra Ismailova, Yelena Senina
Summary: The quantum statistical properties of the proton subsystem in hydrogen-bonded crystals are investigated. A quantum kinetic equation is constructed to describe the motion of non-interacting protons in the crystal potential perturbed by an external electric field. The theoretical results have applications in the development of energy-independent memory elements, the study of tunneling mechanisms in ferroelectric crystals, and the research of solid-state electrolytes for hydrogen energy and microelectronics.
Article
Engineering, Electrical & Electronic
Patrick S. Fuchs, Rob F. Remis
Summary: In this article, we present full-wave signal models for magnetic and electric field measurements in magnetic resonance imaging (MRI). Our analysis takes into account the presence of an object or body via an electric scattering source, allowing the evaluation of these signal models. By deriving explicit signal expressions, we are able to study the sensitivity of the measured signals with respect to the dielectric parameters.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Polymer Science
Ran Xiao, Guozhang Wu, Yu Lin
Summary: The accurate characterization of the interfacial layer is essential for understanding the structure-property relationship in polymer nanocomposites (PNCs). In this study, enthalpy relaxation and interfacial layer properties of model PNCs with attractive interactions were investigated using temperature-modulated differential scanning calorimetry (TMDSC) and broadband dielectric spectroscopy (BDS). Enthalpy relaxation accurately quantified the volume fraction of the interfacial layer, which was consistent with the results from BDS. The parameter (chiint) related to the contribution of the interfacial layer showed similar dependence on nanoparticle loading as the volume fraction estimated from TMDSC. This correlation between enthalpy and dielectric relaxation provides a new approach to characterize the interfacial layer properties and understand the impact on the glass transition behavior in PNCs.
Article
Engineering, Electrical & Electronic
Zheng Chai, Weidong Zhang, Pedro Freitas, Firas Hatem, Jian Fu Zhang, John Marsland, Bogdan Govoreanu, Ludovic Goux, Gouri Sankar Kar, Steve Hall, Paul Chalker, John Robertson
IEEE ELECTRON DEVICE LETTERS
(2018)
Article
Physics, Applied
Z. H. Zaidi, K. B. Lee, J. W. Roberts, I. Guiney, H. Qian, S. Jiang, J. S. Cheong, P. Li, D. J. Wallis, C. J. Humphreys, P. R. Chalker, P. A. Houston
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Crystallography
J. W. Roberts, J. C. Jarman, D. N. Johnstone, P. A. Midgley, P. R. Chalker, R. A. Oliver, F. C-P. Massabuau
JOURNAL OF CRYSTAL GROWTH
(2018)
Article
Physics, Applied
Jidong Jin, Jiawei Zhang, Andrew Shaw, Valeriya N. Kudina, Ivona Z. Mitrovic, Jacqueline S. Wrench, Paul R. Chalker, Claudio Balocco, Aimin Song, Steve Hall
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2018)
Article
Physics, Applied
Miao Cui, Qinglei Bu, Yutao Cai, Ruize Sun, Wen Liu, Huiqing Wen, Sang Lam, Yung C. Liang, Ivona Z. Mitrovic, Stephen Taylor, Paul R. Chalker, Cezhou Zhao
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Engineering, Electrical & Electronic
Oliver J. Vavasour, Richard Jefferies, Marc Walker, Joseph W. Roberts, Naomi R. Meakin, Peter M. Gammon, Paul R. Chalker, Tim Ashley
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2019)
Article
Electrochemistry
Chenguang Liu, Yinchao Zhao, Ruowei Yi, Yi Sun, Yinqing Li, Li Yang, Ivona Mitrovic, Stephen Taylor, Paul Chalker, Cezhou Zhao
ELECTROCHIMICA ACTA
(2019)
Article
Physics, Applied
T. Partida-Manzanera, Z. H. Zaidi, J. W. Roberts, S. B. Dolmanan, K. B. Lee, P. A. Houston, P. R. Chalker, S. Tripathy, R. J. Potter
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Materials Science, Coatings & Films
Justyna Kulczyk-Malecka, David Donaghy, Brice Delfour-Peyrethon, Matthew Werner, Paul R. Chalker, James W. Bradley, Peter J. Kelly
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2020)
Article
Electrochemistry
Chenguang Liu, Yinchao Zhao, Ruowei Yi, Hao Wu, Wenbin Yang, Yinqing Li, Ivona Mitrovic, Stephen Taylor, Paul Chalker, Rui Liu, Li Yang, Cezhou Zhao
ELECTROCHIMICA ACTA
(2020)
Article
Chemistry, Analytical
Armin Barthel, Joseph Roberts, Mari Napari, Martin Frentrup, Tahmida Huq, Andras Kovacs, Rachel Oliver, Paul Chalker, Timo Sajavaara, Fabien Massabuau
Article
Physics, Applied
F. Massabuau, D. Nicol, F. Adams, J. Jarman, J. Roberts, A. Kovacs, P. Chalker, R. Oliver
Summary: This study investigates the electrical, structural, and chemical properties of Ti contacts on atomic layer deposited alpha-Ga2O3 films. It demonstrates that the contact performance is strongly influenced by annealing temperature, and the electrical improvement or degradation can be attributed to oxidation of the Ti metallic layer by the Ga2O3 film and Ti diffusion into the Au layer. It emphasizes the importance of phase-specific and growth method-specific studies on contacts for Ga2O3 devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Review
Chemistry, Physical
Ivona Z. Mitrovic, Saeed Almalki, Serdar B. Tekin, Naser Sedghi, Paul R. Chalker, Stephen Hall
Summary: The quest for utilizing untapped renewable infrared energy sources has spurred significant research efforts into designing, fabricating, and optimizing a self-biased rectenna that operates without external bias voltage. The focus is on the metal insulator metal (MIM) diode, which has fast response time due to femtosecond tunneling process governing current transport. Fabrication of single, double, and triple insulator MIM diodes have been reviewed, with attention to key figures of merit like zero-bias responsivity and zero-bias dynamic resistance. Various oxide combinations have been explored, with sub-nanometer accuracy in oxide stoichiometry and thicknesses seen to optimize responsivity and resistance in advanced rectennas.
Article
Engineering, Electrical & Electronic
I. Nemr Noureddine, N. Sedghi, J. Wrench, P. Chalker, I. Z. Mitrovic, S. Hall
Summary: The study investigates multi-stack metal-insulator-metal (MIM) diodes with ultra-thin Ta2O5/Al2O3 dielectrics through experiment and modeling. Tunnelling transport is modeled using transfer matrix (TMM) and Wentzel-Kramers-Brillouin (WKB) methods. Rectification for a triple dielectric layer device is shown to occur at a turn-on voltage as low as 170 mV with a non-linearity of 3 and an asymmetry increasing from 2.2 at the turn-on voltage to over two orders of magnitude at 1 V.
SOLID-STATE ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
X. Garmendia, S. Chalker, M. Bilton, C. J. Sutcliffe, P. R. Chalker