Review
Chemistry, Inorganic & Nuclear
Cyril Rajnak, Roman Boca
Summary: The thermal behavior of some mononuclear transition metal and lanthanide complexes shows a non-traditional pattern where the relaxation time at low temperatures shortens instead of prolonging. The relaxation time in the low-temperature range can be recovered using equations and processes involving phonon bottleneck and unusual behavior.
COORDINATION CHEMISTRY REVIEWS
(2021)
Review
Chemistry, Inorganic & Nuclear
Roman Boca, Cyril Rajnak
Summary: Slow magnetic relaxation is a common feature in magnetic materials, with the relaxation time determined by high spin reversal barriers and molecular spin. Recent experimental data has shown slow magnetic relaxation in systems with positive, small or negligible D. Some materials exhibit multiple relaxation channels.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Physics, Applied
Yufeng Zhao, Ping Ma
Summary: This study investigates the effect of magnetic relaxation on the ac susceptibility in type-II superconductors. The flux creep equation of ac response is deduced, and the characteristic relaxation time is modified. The results show that the change of the effective relaxation time directly affects the imaginary part of the AC susceptibility.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Physics, Applied
Chaowei Hu, Makariy A. Tanatar, Ruslan Prozorov, Ni Ni
Summary: MBT is the first intrinsic magnetic topological insulator and can be made ferromagnetic through specific methods. We studied the magnetic dynamics of several ferromagnetic MBT compounds and found a universal slow relaxation behavior, attributing it to irreversible domain movements. The soft nature of ferromagnetic domains was revealed by our magneto-optical measurements.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Joanna Milam-Guerrero, Michelle Zheng, Nicole R. Spence, Mario Falsaperna, Stuart Calder, Saul Lapidus, Paul J. Saines, Brent C. Melot
Summary: The study reveals that despite well-pronounced magnetic transitions at low temperatures in both iron-based garnets, there is evidence of diffuse magnetic scattering due to competition within the tetrahedral sites, resulting in a complex noncollinear magnetic structure with a mixture of ferro- and antiferromagnetic interactions.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Ganesan Senthil Murugan, Suheon Lee, C. Wang, H. Luetkens, Kwang-Yong Choi, Raman Sankar
Summary: We combine μSR technique with thermodynamic measurements to explore the spin dynamics of one-dimensional S = 1/2 antiferromagnetic double chain KNaCuP2O7. Results show that the high-temperature diffusive spin transport turns into ballistic behavior below 30K. In addition, longitudinal-field μSR varies hardly with an external magnetic field.
Letter
Chemistry, Multidisciplinary
Hongyu Bian, Caisheng Tang, He Zhao, Xian Qin, Xiaogang Liu
Summary: Trivalent lanthanides are commonly used in sodium yttrium fluoride nanocrystals to improve their optical properties. At low dopant concentrations, large lanthanides exhibit an anisotropic distribution in the hexagonal yttrium sublattice, suggesting the formation of one-dimensional dimers or chains. Our research indicates that the concentration quenching threshold of beta-NaYF4 nanocrystals is lower than that of their cubic counterparts, and the anistropic distribution can be modulated by microstrain management via alkali metal codoping. Understanding dopant distribution in inorganic crystals may lead to the development of new materials and properties in the future.
Article
Materials Science, Multidisciplinary
Mohd Mawardi Saari, Mohd Herwan Sulaiman, Nurul Akmal Che Lah, Zulkifly Aziz, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Summary: This study characterizes the size distribution of magnetic cores in single- and multi-core nanoparticles in water suspension using transmission electron microscopy and static magnetization curve analysis. The magnetic moment distribution suggests a reduction in effective magnetic core size due to magnetization degradation. The AC susceptibility response of MNPs from 5 Hz to 100 kHz is also evaluated to understand the average anisotropy energy ratio.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Matthew J. Fox, Ashlee Aiello, Shize Yang, Paul C. Trulove, David P. Durkin, Elena Cimpoiasu
Summary: Biocomposites containing magnetic nanoparticles have the potential to combine the unique properties of nanoparticles with the strong mechanical and sustainable properties of natural fibers. This study investigates how the structural and magnetic properties of these biocomposite materials are affected by increasing metal loading, finding that higher metal loading enhances nanoparticle heterogeneity and agglomeration.
MATERIALS CHEMISTRY AND PHYSICS
(2024)
Article
Chemistry, Inorganic & Nuclear
Juan A. Ramos-Guivar, F. Jochen Litterst, Edson C. Passamani
Summary: The magnetic properties of maghemite nanoparticles grown on activated multiwall carbon nanotubes were studied, revealing the formation of a superspin glass state. The presence of highly concentrated magnetic regions due to the multiwall carbon nanotubes favored the appearance of the superspin glass state.
Article
Engineering, Multidisciplinary
Mohd Mawardi Saari, Mohd Herwan Sulaiman, Hamzah Ahmad, Nurul Akmal Che Lah, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Summary: In this study, a benchtop induction-based AC magnetometer was developed for bio-sensing applications and characterization of magnetic nanoparticles (MNPs). The sensitivity and usable frequency range of six different pickup coil geometries were investigated. A low noise instrument amplifier circuit and a generalized Goertzel algorithm were used to amplify the signal and extract the amplitude and phase. The developed magnetometer showed high sensitivity and a wide frequency range. The viscosity effect on the frequency response of MNPs in glycerol solutions was demonstrated. The developed AC magnetometer is expected to be a valuable tool in bio-sensing applications.
ENGINEERING RESEARCH EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
R. Algarni, Y. Slimani, E. Hannachi, M. A. Almessiere, B. H. Alqahtani, S. Akhtar, F. Ben Azzouz
Summary: YBCO superconductors doped with dysprosium oxide nanoparticles were prepared using a solid-state process and characterized through various measurements. The addition of dysprosium oxide resulted in significant enhancements of certain superconducting parameters while causing a decrease in the intergranular critical current density.
CURRENT APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Bin Gao, Tong Chen, Xiao-Chuan Wu, Michael Flynn, Chunruo Duan, Lebing Chen, Chien-Lung Huang, Jesse Liebman, Shuyi Li, Feng Ye, Matthew B. Stone, Andrey Podlesnyak, Douglas L. Abernathy, Devashibhai T. Adroja, Manh Duc Le, Qingzhen Huang, Andriy H. Nevidomskyy, Emilia Morosan, Leon Balents, Pengcheng Dai
Summary: Magnetic order can still occur in materials with spin-singlet ground state due to exchange interactions mixing excited crystal electric field states. The study investigates Ni2Mo3O8 and finds that crystal electric field states in both the paramagnetic and antiferromagnetic states exhibit dispersive excitations.
NATURE COMMUNICATIONS
(2023)
Article
Biochemical Research Methods
Zhongzhou Du, Yanying Cui, Yi Sun, Haochen Zhang, Shi Bai, Takashi Yoshida
Summary: Magnetic nanoparticles have been widely studied for their applications in biomedicine and industry. In this study, the frequency dependence of magnetization of magnetic nanoparticles under different AC excitation fields was analyzed. A simple empirical AC susceptibility model was proposed based on the difference in AC susceptibility between Fokker-Planck equation and Debye model. Simulation and experimental results confirmed the accuracy of the proposed model.
IEEE TRANSACTIONS ON NANOBIOSCIENCE
(2022)
Article
Physics, Multidisciplinary
J. E. Hirsch, D. van der Marel
Summary: This study reports the analysis results of carbonaceous sulfur hydride material, finding that the measured raw data are inconsistent with the published data. These results have significant implications for the claim that the material is a room temperature superconductor.
MATTER AND RADIATION AT EXTREMES
(2022)
Article
Materials Science, Multidisciplinary
David L. Bollinger, Jessica Erickson, John M. Bussey, John S. McCloy
Summary: In this study, mixed-anion sodalites were synthesized from a simulated caustic scrubber solution, and the experimental conditions were optimized through statistical analysis. The results showed successful immobilization of radioactive iodine and other anions from the caustic scrubber.
Article
Materials Science, Multidisciplinary
Marc H. Weber, J. S. McCloy, C. R. Halverson, S. E. Karcher, R. Mohun, C. L. Corkhill
Summary: Nuclear fuels undergo continuous radioactive decay and fission after being removed from the reactor, and they are subjected to high temperature and persistent irradiation. Investigating the irradiation damage in nuclear materials is crucial for understanding the differences caused by doping atoms in the crystal.
Article
Materials Science, Multidisciplinary
Arumala Josiah Lere-Adams, Nicholas Stone-Weiss, David L. Bollinger, John S. McCloy
Summary: This study explored low melting point glass systems as binders for solid oxide nuclear wastes. The composition of the glass systems was selected based on available phase diagrams and the desire to explore the entire glass-forming region. Promising glass binders were identified based on their thermal properties and absence of crystallization. The selected glass compositions were further studied for their crystallization behavior.
Article
Physics, Applied
Jani Jesenovec, Benjamin Dutton, Nicholas Stone-Weiss, Adrian Chmielewski, Muad Saleh, Carl Peterson, Nasim Alem, Sriram Krishnamoorthy, John S. McCloy
Summary: Different Al2O3 contents in β-AGO single crystals were investigated to determine the effects on lattice parameters, vibrational modes, optical bandgap, and crystallographic site preferences.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Archaeology
Rolf Sjoblom, Eva Hjarthner-Holdar, Carolyn I. Pearce, Jamie L. Weaver, Erik Ogenhall, John S. McCloy, Jose Marcial, Edward P. Vicenzi, Michael J. Schweiger, Albert A. Kruger
Summary: The paper discusses the reasons for the vitrification phenomenon in hillforts and emphasizes the importance of evaluating different hillforts individually. By evaluating the Broborg hillfort, it is concluded that the vitrification occurred for the purpose of constructing the fort.
JOURNAL OF ARCHAEOLOGICAL SCIENCE-REPORTS
(2022)
Article
Materials Science, Ceramics
Irmak Sargin, John S. McCloy, Scott P. Beckman
Summary: Understanding the impact of individual compositional components on the devitrification of complex multicomponent glasses is important for generating transferrable knowledge. In this study, exploratory data analysis was used to analyze a heterogeneous data set of silicate glasses and determine the individual and interacting effects of cations on the crystallization of nepheline. The study showed that calculated structural glass parameters, such as field strength and cation-to-anion radius ratio, play a crucial role in nepheline's devitrification. Additionally, it was found that studies with simplified glass compositions may not provide directly applicable knowledge to complex compositions.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Chenxu Wang, Chunhua Ying, Jing Shang, Sam Ellery Karcher, John McCloy, Jin Liu, Wei-Hong Zhong
Summary: The study utilizes BSA protein coating to stabilize Li anode, regulate Li+ transport, and resolve Li dendrite growth, improving battery performance and laying a foundation for enhancing the electrochemical performance of energy storage systems with protein-based materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Green & Sustainable Science & Technology
Lauren Likes, Ananya Markandeya, Md Mostofa Haider, David Bollinger, John S. McCloy, Somayeh Nassiri
Summary: This study demonstrates the successful implementation of eco-friendly recycled powders (RPs) in concrete, reducing cement demand and associated CO2 emissions. Despite having weaker pozzolanic/hydraulic activity, the RPs positively affected the mechanical properties and durability of concrete.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Ceramics
Jose Marcial, Maria Rita Cicconi, Carolyn Pearce, Jaroslav Klouzek, James J. Neeway, Richard Pokorny, Miroslava Vernerova, John S. McCloy, Emily T. Nienhuis, Rolf Sjoblom, Jamie L. Weaver, Russell J. Hand, Pavel Hrma, Daniel R. Neuville, Albert A. Kruger
Summary: This study investigated the melting behavior, glass transition temperature, oxidation state, network structure, and chemical durability of 1500-year-old vitrified hillfort glasses. The results showed that the oxidation state of iron affected the network connectivity of the glass-forming melt, but it did not affect the chemical durability of the final glass. Glasses with lower network connectivity had lower viscosity and transition temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Jacqueline Cooke, Praneeth Ranga, Jani Jesenovec, Arkka Bhattacharyya, Xueling Cheng, Yunshan Wang, John S. McCloy, Sriram Krishnamoorthy, Michael A. Scarpulla, Berardi Sensale-Rodriguez
Summary: This study utilizes spectral analysis and PL microscopy to investigate various micrometer-scale extended defects in 13-Ga2O3 and 13-(Al,Ga)2O3 materials. The defects include pits, divots, mounds, etc. The combined use of PL microscopy with AFM and SEM provides detailed characterization of these defects.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Syeed E. Ahmed, Violet M. Poole, Jani Jesenovec, Benjamin L. Dutton, John S. McCloy, Matthew D. McCluskey
Summary: Annealing Ba1-xCaxTiO3 (BCTO) under a flowing humid 2% hydrogen-argon gas mixture results in room-temperature persistent photoconductivity (PPC). This is attributed to the presence of substitutional hydrogen impurities that can be photoexcited. The threshold photon energy for PPC in BCTO is lower than that of BaTiO3 and SrTiO3, and the effect is reversible upon annealing in air.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Xinyi Xu, Rajan Saini, Enver Koray Akdogan, John Stuart McCloy, Ashutosh Goel
Summary: In this study, the impact of glass network formers, such as SiO2, B2O3, and Al2O3, on the corrosion of Monofrax K-3 refractory in a model nuclear waste glass composition has been investigated. Corrosion tests were conducted at 1150 degrees C for 5 days, revealing that Al2O3 and SiO2 tend to reduce the corrosion of the refractory, with Al2O3 having a significant effect. A corroded region at the melt-refractory interface was observed. The corrosion is primarily caused by the infiltration of the melt into the refractory through capillary effect, leading to dissolution of Al, Mg, and Fe components into the melt. A Cr-rich layer remains on the glass contact surface of the corroded K-3 refractory.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Anjali Yadav, Saehwa Chong, Brian J. Riley, John S. McCloy, Ashutosh Goel
Summary: The article presents the complete process of I2(g) capture using Ag-exchanged faujasite (AgX) and Ag-exchanged mordenite (AgZ) zeolite sorbents, the recovery of Ag for recyclability of iodine capture, and the immobilization of iodide into iodosodalite waste form.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
John S. McCloy, Nicholas Stone-Weiss, David L. Bollinger
Summary: Caustic scrubbers (CS) are used to capture radioiodine in nuclear fuel reprocessing plants by reacting with dissolved anions and forming aluminosilicate powders. The CS aluminosilicates were characterized using Na-23 and Al-27 magic angle spinning nuclear magnetic resonance (NMR) to understand their crystalline and amorphous structures. The NMR results revealed the presence of various chemical environments in the mixed sodalite assemblage.
Article
Materials Science, Ceramics
Chenxu Wang, Pedaballi Sireesha, Jing Shang, John S. McCloy, Jin Liu, Wei -Hong Zhong
Summary: This study presents a green synthesis method to fabricate stable porous Fe2O3 as an anode material for Li-ion batteries. The synthesized material effectively accommodates volume change, reduces pulverization, and alleviates agglomeration, leading to a high capacity.
CERAMICS INTERNATIONAL
(2023)
