Article
Physics, Applied
S. N. Holmes, J. Gough, C. Chen, D. A. Ritchie, M. Pepper
Summary: The study found that n-type doped InSb wafers can exhibit variable range hopping transport mechanism induced by Ga+ ion beam damage, with high damage levels showing three-dimensional behavior and lower doses displaying characteristics of Mott phonon-assisted VRH. Controlling the level of damage can alter the transport properties of the devices, allowing for the study of coherent transport processes in the hopping regime.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Zhiming Liang, Hyun Ho Choi, Xuyi Luo, Tuo Liu, Ashkan Abtahi, Uma Shantini Ramasamy, J. Andrew Hitron, Kyle N. Baustert, Jacob L. Hempel, Alex M. Boehm, Armin Ansary, Douglas R. Strachan, Jianguo Mei, Chad Risko, Vitaly Podzorov, Kenneth R. Graham
Summary: It has been shown through Seebeck coefficient and Hall effect measurements that mobile electrons play a significant role in charge-carrier transport in p-conjugated polymers heavily p-doped with strong electron acceptors. Doping with oxidizing agents eliminates the transport gap at high doping concentrations, indicating a promising route to high-performance n-type organic thermoelectric materials.
Article
Materials Science, Multidisciplinary
Lalita Chauhan, Sudhanshu Kumar, K. Sreenivas, A. K. Shukla
Summary: This study on nickel ferrite ceramics revealed multiple relaxations in dielectric, impedance, and modulus spectra, indicating different conduction mechanisms at varying temperatures. Multiple relaxations were observed due to hopping of holes and electrons, with defect hopping only seen at higher temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
P. A. Francis Xavier, M. D. Benoy, Nidhi P. Ramesh, Thomas Varghese
Summary: In this study, a thin film of polyaniline-functionalized multiwalled carbon nanotube composite with exceptional electrical conductivity, excellent crystallinity and improved thermal stability was synthesized and characterized. The multiwalled carbon nanotubes were functionalized using formaldehyde through an electrophilic substitution reaction and attached with methylol groups. The functionalization resulted in significant dispersivity of the composite. The thin film sample showed enhanced electrical conductivity and excellent crystallinity, and exhibited high thermal stability compared to the polyaniline sample.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
I Dhanya, Malathy Krishnan, Reny Renji, M. K. Anu, Rachel G. Varghese, Sreejith K. Pisharady
Summary: Thin films of Vanadyl 2, 11, 20, 29, Tetra Tert-Butyl 2,3 Naphthalocyanines [VTTBNc] were prepared by vacuum evaporation technique, and their electrical properties were studied. The conductivity of the thin films showed an exponential variation with temperature, while the density of states near the Fermi level decreased and hopping distance increased with thickness and substrate temperature.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Y. Moualhi, M. Smari, H. Rahmouni, K. Khirouni, E. Dhahri
Summary: From the XRD results, it is found that the La0.5Ca0.2Ag0.3MnO3 compound studied has an orthorhombic structure with Pnma space group. The electrical conductivity and magnetic properties of the compound exhibit complex transport mechanisms and phase transition behavior, indicating semiconductor characteristics over the explored temperature region.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
P. A. Francis Xavier, M. D. Benoy, Seenamol K. Stephen, Thomas Varghese
Summary: The study successfully synthesized hydrochloric acid doped polyaniline - multiwalled carbon nanotube nanocomposites, which exhibit high electrical conductivity, good thermal stability, and potential applications operating at high temperatures. Analysis of the charge transport mechanism and validation of mathematical models provide insight for further electrical applications.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Vishal Chaudhary
Summary: The study investigates the low-temperature direct current charge transport mechanism in PAN-WO3 nanocomposite. The inclusion of WO3 shifts the hopping dimensionality from 3-D to 1-D, leading to enhanced conductivity. The enhanced sensing behavior towards hydrazine in PAN-WO3 nanocomposite is attributed to its higher conductivity and intra-chain charge transport.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
W. Hizi, H. Rahmouni, K. Khirouni, E. Dhahri
Summary: La0.9Sr0.1MnO3 nanoparticles were synthesized using the citrate-gel route, and the prepared sample exhibited rhombohedral symmetry. The electrical conductivity measurements revealed that transport properties are governed by hopping processes at different temperature ranges, and the thermal activation of charge-carriers was confirmed. The frequency dependence of the AC-conductivity obeyed the Double Jonscher Power Law in the temperature range [80-300 K], and a high frequency plateau was observed in the conductivity spectrum.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Ilaria Ragazzini, Riccardo Castagnoli, Isacco Gualandi, Maria Cristina Cassani, Daniele Nanni, Francesca Gambassi, Erika Scavetta, Elena Bernardi, Barbara Ballarin
Summary: Ambient humidity is an important parameter that affects the manufacturing and storage of industrial and agricultural goods. This paper reports the development of a low-cost humidity sensor made of cellulose and polyaniline, which shows similar performance to a commercial sensor. The sensor has potential applications in agriculture, food monitoring, and medical and industrial environments.
Article
Physics, Condensed Matter
Anjali Panwar, Neeleshwar Sonnathi, Subhendra D. Mahanti, Vikas Malik, Anjana Bagga
Summary: In this study, the underlying physics of the high electrical conductivity, temperature dependence, and large power factors in undoped SnSe nanoflakes have been theoretically investigated. The observed trends can be explained by a strong disorder model based on percolation theory, where charge and energy transport occur through hopping between localized states. The results suggest that hopping transport via localized states can enhance the thermoelectric properties of disordered polycrystalline materials.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Jicheng Zhang, Qi Yang, Jiankun Wu, Jia Li, Zhaoguo Li
Summary: The electrical transport properties of zirconium oxynitride films are investigated, and a transition from positive to negative magnetoresistance is observed in the variable-range hopping transport regime with decreasing temperature. The positive magnetoresistance is caused by the shrinkage effect of electronic wavefunctions, while the negative magnetoresistance, independent of magnetic field orientations, can be attributed to Zeeman splitting and/or spin-flip hopping effect of localized states. Further experimental studies are required to elucidate the exact transition mechanism.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Polymer Science
M. A. Kudryashov, A. A. Logunov, L. A. Mochalov, Yu P. Kudryashova, M. M. Trubyanov, A. Barykin, I. V. Vorotyntsev
Summary: The study investigates the frequency dependence of the conductivity and electric modulus of silver/polyacrylonitrile nanocomposites, revealing a power law relationship between conductivity and frequency, as well as the impact of interfacial polarization on the imaginary part of the electric modulus. The frequency dispersions of conductivity and electric modulus are well described by the Dyre and Cole-Davidson models, allowing for the estimation of relaxation times and activation energies. The proposed mechanism of charge transport in nanocomposites involves the presence of Ag-4(2+) and Ag-8(2+) silver clusters within the polymer.
Article
Chemistry, Inorganic & Nuclear
Faycal Bourguiba, Hend Kacem, Samia Nasr, M. Abassi, E. K. Hlil, J. Dhahri, K. Taibi, H. Belmabrouk
Summary: In this study, BaTiO3 ceramics doped with double cation couple (Fe3+, Mo6+) or (Fe3+, W6+) were fabricated, and the effects of dopants on the electrical and magnetic properties were systematically studied. The materials exhibited high dielectric constant and magnetism, with the contributions of microstructures and defects playing a critical role.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Helmut Werheit, Bernhard Herstell, Walter Winkelbauer, Gabriel Pristas, Slavomir Gabani, Karol Flachbart, Sulkhan Shalamberidze
Summary: This study investigates the electronic properties of B4.3C and finds that the electrical conductivity follows Mott's law of variable-range hopping at low temperatures and is thermally activated at high temperatures, with the activation energy providing information about the energy position of gap states related to the chemical composition.
SOLID STATE SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Mario Novak, Satoshi Sasaki, Kouji Segawa, Yoichi Ando
Article
Materials Science, Multidisciplinary
Mirko Bacani, Mario Novak, Ivan Kokanovic, Dinko Babic
CURRENT APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
Jan Wyzula, Xin Lu, David Santos-Cottin, Dibya Kanti Mukherjee, Ivan Mohelsky, Florian Le Mardele, Jiri Novak, Mario Novak, Raman Sankar, Yuriy Krupko, Benjamin A. Piot, Wei-Li Lee, Ana Akrap, Marek Potemski, Mark O. Goerbig, Milan Orlita
Summary: The optical response of crystalline solids is affected by excitations that promote electron transitions between energy bands. Optical and magneto-optical methods have been used to experimentally determine the energy band gap, a fundamental property of solids. However, these conventional methods do not work for topological Dirac semiconductors with a dispersive nodal line. This unusual behavior can be explained by band-gap renormalization driven by Lorentz boosts.
Article
Materials Science, Multidisciplinary
F. Le Mardele, J. Wyzula, I. Mohelsky, S. Nasrallah, M. Loh, S. Ben David, O. Toledano, D. Tolj, M. Novak, G. Eguchi, S. Paschen, N. Barisic, J. Chen, A. Kimura, M. Orlita, Z. Rukelj, Ana Akrap, D. Santos-Cottin
Summary: TlBiSSe is a rare three-dimensional semimetal with a conically dispersing band and isolated optical response in a broad range of photon energies. In this study, we conducted optical and magneto-optical spectroscopy on this material and found a linear frequency dependence of the optical conductivity below 0.5 eV in the state of lowest carrier concentration. Landau level spectroscopy allowed us to describe the system using a massive Dirac model, revealing a 32 meV gap and a 4.0 x 105 m/s in-plane velocity parameter.
Article
Materials Science, Multidisciplinary
Bruno Gudac, Markus Kriener, Yuriy Sharlai, Mihovil Bosnar, Filip Orbanie, Grigorii P. Mikitik, Akio Kimura, Ivan Kokanovic, Mario Novak
Summary: We demonstrate a unique approach to test the signature of the nodal-line physics by thermodynamic methods. By measuring magnetic susceptibility in ZrSiS, we found an intriguing temperature-driven crossover from paramagnetic behavior. The anomalous behavior represents a real thermodynamic signature of the underlying nodal-line physics, which can be verified through chemical pressure, quantum oscillations, and theoretical modeling. The results in ZrSiS provide a starting point for exploring other nodal-line physics-related phenomena in other materials using thermodynamic methods.
Article
Materials Science, Multidisciplinary
D. Santos-Cottin, J. Wyzula, F. Le Mardele, I Crassee, E. Martino, J. Novak, G. Eguchi, Z. Rukelj, M. Novak, M. Orlita, Ana Akrap
Summary: In this study, the researchers investigated the Weyl nodes in the topological semimetal TaAs and found the conical band of the W-2 nodes, while the W-1 nodes were found to be buried deeper and less accessible.
Article
Materials Science, Multidisciplinary
F. Orbanic, M. Novak, Z. Glumac, A. McCollam, L. Tang, I Kokanovic
Summary: Our study on quantum oscillations in the nodal-line Dirac semimetal ZrSiS reveals contributions from both low frequency and high frequency oscillations, with detailed analysis showing the origins of different oscillation frequencies and their relationship to the Fermi surface topology. The high resolution mapping of the Fermi surface in different magnetic fields and temperatures provides new insights into the novel properties of ZrSiS and related compounds.
Article
Materials Science, Multidisciplinary
F. Le Mardele, D. Santos-Cottin, E. Martino, K. Semeniuk, S. Ben David, F. Orbanic, M. Novak, Z. Rukelj, C. C. Homes, Ana Akrap
Article
Materials Science, Multidisciplinary
Xiaoxiao Wang, Jiahua Chen, Mingtian Zheng, Tatiana Menshchikova, Igor P. Rusinov, Eike F. Schwier, Filip Orbanic, Shilong Wu, Kazuki Sumida, Tomoki Yoshikawa, Koji Miyamoto, Munisa Nurmamat, Taichi Okuda, Kenya Shimada, Mario Novak, Evgueni Chulkov, Akio Kimura
Article
Materials Science, Multidisciplinary
M. Novak, S. N. Zhang, F. Orbanic, N. Biliskov, G. Eguchi, S. Paschen, A. Kimura, X. X. Wang, T. Osada, K. Uchida, M. Sato, Q. S. Wu, O. Yazyev, I Kokanovic
Proceedings Paper
Physics, Applied
F. Orbanic, M. Novak, S. Pleslic, I. Kokanovic
28TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT28)
(2018)
Proceedings Paper
Physics, Applied
Filip Orbanic, Mario Novak, Nikola Biliskov, Sanda Pleslic, Ivan Kokanovic
8TH JOINT EUROPEAN MAGNETIC SYMPOSIA (JEMS2016)
(2017)
Article
Materials Science, Multidisciplinary
Satoki Maeda, Ryohei Hirose, Kazuaki Matano, Mario Novak, Yoichi Ando, Guo-qing Zheng
Article
Materials Science, Multidisciplinary
Mirko Bacani, Mario Novak, Filip Orbanic, Krunoslav Prsa, Ivan Kokanovic, Dinko Babic
Article
Materials Science, Multidisciplinary
Filip Orbanic, Mario Novak, Mirko Bacani, Ivan Kokanovic
Article
Materials Science, Ceramics
Deniz Bozoglu, Sahin Yakut, Kemal Ulutas, Deniz Deger
Summary: Thin film polyethylene oxide, produced by the thermal evaporation technique, exhibits structural and property differences compared to bulk polyethylene oxide. The dielectric constant of polyethylene oxide thin film is 10 times greater than that of bulk polyethylene oxide. There is consistency among dielectric constants, activation energies, and free volume fractions for both thin film and bulk samples. Polyethylene oxide thin film is observed to be more brittle than bulk polyethylene oxide.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Xiaozhen Fan, Zhuo Wang, Zheng Fang, Huiqun Ye, Jinju Zheng, Jianqiang Zhang, Yanjun Qin, Yao Zhai, Yanlong Miao, Zixiang Zhao, Can Yang, Jiajun He, Zhenghang Wei, Yunzhang Fang
Summary: The microscopic strain evolution and microstructural of FeCuNbSiB amorphous alloy samples were studied under both free and tensile stress annealing conditions. It was found that an amorphous-nanocrystalline structure was developed in both samples after annealing at 813 K, and the size of nanocrystals was limited by the applied stress.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Atsushi Tanaka, Atsuki Saito, Takashi Murata, Ayako Nakata, Tsuyoshi Miyazaki
Summary: Although molecular dynamics (MD) simulation is a powerful tool for investigating the atomic-scale structures of complex materials, its reliable and accurate application to multi-component glass systems faces challenges due to limited force fields (FFs) and the complexity of chemical environments. This study demonstrates the feasibility of efficient and accurate large-scale density functional theory (DFT) calculations for multi-component glass systems. The evaluation of classical FFs based on the results of large-scale DFT calculations reveals low accuracy for non-bridging oxygen atoms, and differences in Si-O-Si angle distribution and electronic structure for X = Mg.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Petr Shvets, Ksenia Maksimova, Aleksandr Goikhman
Summary: In this study, vanadium oxide xerogel samples were successfully synthesized through a liquid phase reaction and the interaction of films with water. The samples were thoroughly analyzed using X-ray diffraction and Raman spectroscopy, revealing the existence of two distinct phases. It was also discovered that previous misinterpretations regarding the high-pressure polymorph structure were due to the formation of a high-temperature phase. These findings highlight the potential for further refining and expanding the current structural models of vanadium oxide xerogel in future research efforts.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Yiran Zhang, Jing Pang, Qingchun Xiang, Dong Yang, Yinglei Ren, Xiaoyu Li, Keqiang Qiu
Summary: The effect of the volume fraction of body-centered cubic (BCC) crystal on the room temperature brittleness of Fe-based amorphous nanocrystalline alloys was investigated. Molecular dynamics simulations were conducted to obtain seven model samples with different embedded BCC nanocrystal contents. The results showed a gradient decrease in the plasticity of the alloys with different nanocrystal contents.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Moustafa Sahnoune Chaouche, Hani K. Al-Mohair, Shavan Askar, Barno Sayfutdinovna Abdullaeva, Naseer Ali Hussien, Ahmed Hussien Alawadi
Summary: In this work, a novel micromechanical data-driven machine learning framework was proposed to characterize material parameters in bulk metallic glasses. The framework utilized nanoindentation simulations with Berkovich and spherical tips to compile a vast collection of data on material behavior in BMGs. The developed machine learning model efficiently predicted critical material properties and highlighted the importance of input feature weight functions.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Louisiane Verger, Vinuyan Ganesaratnam, Virginie Nazabal, Sebastien Chenu, Christophe Calers, David Le Coq, Laurent Calvez, Olivier Hernandez, Xiang-Hua Zhang
Summary: Crystallization in Ga, Sb, and Se glasses was studied, and a correlation between Se content, crystalline phases, and electrical conductivity was observed. The resulting glass-ceramics exhibited significantly higher conductivity compared to other Se-based glass-ceramics.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Seong-Sik Shin, Ga-Yeong Kim, Byeonggwan Lee, Jae-Hwan Yang, Yeon-Su Son, Jung-Hoon Choi, Jae-Young Pyo, Ki Rak Lee, Hwan-Seo Park, Hyun Woo Kang
Summary: In this study, silver tungstate-tellurite glass with different loading of AgI was developed for immobilization of radioactive iodine. The effects of increasing the amount of AgI on the glass matrix were investigated. The leaching properties of all samples were evaluated, and it was found that the release of all elements satisfied the US regulation.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Chunghee Nam
Summary: This study demonstrates the prediction performance of a CNN regression model for the magnetic entropy changes and transition temperatures of bulk metallic glasses with magnetocaloric effects. The model achieved high prediction performance, as measured by the determination coefficient and root mean square error. The results showed good agreement with experimental values and reported results.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
A. Hosny, Y. M. Moustafa, G. El-Damrawi
Summary: In this study, crystalline glass ceramics were obtained directly from glasses using an ion exchange process between lead bromide and oxygen ions. The addition of lead bromide caused significant changes in the glass structure and the formation of specific crystalline phases.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Luana Cristina Feitosa Alves, Jheimison Ferreira Gomes, Natacya Fontes Dantas, Maria Nayane Queiroz, Pablo Nabuco Portes, Francielle Sato, Nilma de Souza Fernandes, Karina Miyuki, Celso Vataru Nakamura, Alysson Steimacher, Franciana Pedrochi
Summary: This study evaluated the influence of CaF2 addition on the bioactivity of the samples. The results showed that the samples exhibited good bioactivity and cytocompatibility, making them suitable for biomedical applications.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
N. Keninger, S. Feller
Summary: The principles of Topological Constraint Theory (TCT) were used to study alkali borate and silicate glass systems. Structural models were developed based on experimental data and used to predict properties of the glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Hao Wang, Chengliang Zhao, Chuntao Chang, Shengli Zhu, Zhankui Zhao
Summary: The relationship between the heterogeneous structure and structural relaxation in metallic glasses was explored by investigating the quasielastic and viscoelastic behavior of a Zr55Cu30Ni5Al10 metallic glass. Stress-annealing treatment was used to retain elastic strain energy, and a unique creep recovery phenomenon was observed during the reheating process. The Maxwell model was employed to qualitatively describe the mechanisms of elastic strain energy retention and release.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Sihyung Lee, Giyeol Han, Karuppasamy Pandian Marimuthu, Hyungyil Lee
Summary: This study presents a method for extracting FVM parameters of Zr-based TFMG using MD and FEA, and validates the method through simulation and experiments.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Materials Science, Ceramics
Nedra Saad, Mohamed Haouari, Mayssa Ibrahim, Noura Amamou
Summary: In this work, we investigated the optical properties of a fluorophosphate glass system doped with Tb3+ and Eu3+ ions. We found that the emitted light can be tuned by changing the doping concentration, excitation wavelength, or excitation power, which is important for the design of solid-state lighting sources.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
