Article
Materials Science, Multidisciplinary
Sarodi Jonak, J. P. Borah
Summary: The study shows that annealing Fe3O4 nanoparticles at different temperatures can modulate structural and magnetic parameters, ultimately optimizing the heating efficiency for magnetic hyperthermia applications. Confirmation of cation migration was obtained through XRD peak intensity and FTIR study, while crystallite sizes were found to decrease with heat treatment. This research highlights the importance of particle size and magnetic anisotropy in enhancing the heating efficiency of Fe3O4 nanoparticles.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Ankur Sinha, Gloria Ischia, Luca Lutterotti, Stefano Gialanella
Summary: This paper is the second in a series on the quantitative characterization of nanocrystalline materials using an electron-diffraction-based approach. The previous paper established a standard calibration protocol and this paper considers possible application cases and conducts empirical studies on different material samples. The limitations of the proposed approach are demonstrated and the results are critically discussed.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Materials Science, Ceramics
Miguel Angel Cobos, Patricia de la Presa, Ines Puente-Orench, Irene Llorente, Irene Morales, Asuncion Garcia-Escorial, Antonio Hernando, Jose Antonio Jimenez
Summary: Samples with different inversion parameter values were prepared through mechanical grinding and thermal annealing treatments, and characterized by X-ray, neutron diffraction, and magnetic measurements. The coexistence of short range antiferromagnetic and ferrimagnetic ordering at low temperature was confirmed for the first time, and a different magnetic phase diagram from previous reports was obtained.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yijie Tang, Jin Wang, Junxia Wang, Yan Wang, Xusheng Li
Summary: A series of pyrochlore solid solutions with the general formula Nd2(Zr1-xCex)2O7 were successfully synthesized by the glycine-nitrate process auto-combustion method and sintered at high temperature. The ordered-disordered structure of the as-prepared ceramic samples was characterized by XRD and Raman spectroscopy, revealing a co-existence structure composed of ordered pyrochlore and disordered defect-fluorite structure. The effect of 48f oxygen on phase transition was confirmed by XRD and Raman spectroscopy. TEM analysis showed biphasic structures and C-type microdomains in the specimens.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Young-Il Kim, Maxim Avdeev
Summary: Perovskite lattice was modified with site vacancies and mixed anion composition to create Sr0.83Li0.17Ta0.83O1.88N0.74 (Li02N), which was further transformed into Sr0.83Li0.17Ta0.83O3 (Li02O) with optimized treatment. Both Li02N and Li02O showed Arrhenius behavior of ionic conductivity with different activation energies, suggesting that the nitride component enhances ionic conduction while anion lattice vacancies have the opposite effect.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Applied
Yaping Zhang, Yi Zhou, Tu Sun, Pengyu Chen, Chengmin Li, Yoshihiro Kubota, Satoshi Inagaki, Catherine Dejoie, Alvaro Mayoral, Osamu Terasaki
Summary: This study investigated the structures of YNU-5 zeolites using various techniques, with a focus on advanced electron microscopy methods. The space group for the YNU-5 zeolites was determined to be Cmmm, showing higher symmetry than previously reported. Additionally, Rietveld refinement of synchrotron Powder X-ray diffraction data provided precise information on the framework and the location of organic species, cations, and water.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Applied
Junhyuck Im, Jaewoo Jung, Kiho Yang, Donghoon Seoung, Yongmoon Lee
Summary: This study investigated the structural changes in zeolites fully exchanged with Sr, Cd, and Pb at temperatures ranging from room temperature to 350 degrees Celsius. The results showed that zeolites are easily dehydrated at high temperatures, and Sr and Pb may not have thermal stability while Cd remains intact.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ryo Ishikawa, Yujiro Ueno, Yuichi Ikuhara, Naoya Shibata
Summary: This study reveals the formation of chemically ordered intermetallic nanoparticles and impregnation of nanoparticles into the oxide substrate at high temperatures. Negative charge transfer from the intermetallic nanoparticles to the oxide surface is observed and found to strongly affect the catalytic activities.
Article
Chemistry, Physical
Jiaxin Gong, Jiheng Li, Xiaoqian Bao, Ruifen Hou, Xuexu Gao
Summary: The crystal structure and magnetic structure of Tb-Dy-Fe compounds were studied before and after annealing heat treatment, revealing the existence of tetragonal and rhombohedral phases at room temperature. The volume proportion of the hexagonal phase increased after heat treatment, and the effect of structural distortion on the magnetostriction of Tb-Dy-Fe was discussed based on analytical results.
Article
Chemistry, Physical
S. Mrabet, N. Ihzaz, M. Alshammari, N. Khlifi, M. Ba, M. N. Bessadok, I. H. Mejri, L. El Mir
Summary: Pure and doped ZnO nanoparticles were synthesized via a modified sol-gel method. The crystal structure of ZnO remained intact with vanadium doping, as confirmed by various analytical techniques. SEM and TEM were used to examine the morphology of the samples. UV-Vis-NIR spectra showed changes in the band gap and absorption band with increased vanadium content. Photoluminescence analysis revealed the creation of defects in the band gap due to vanadium doping. Magnetic studies indicated a mixed state of ferromagnetic and paramagnetic phases, with magnetic interaction explained by defects-induced magnetic polarons.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
G. Darin, K. Imakuma, R. T. Santiago, K. L. Da Silva, L. F. Cotica, M. Fabian, J. Valicek, H. Hahn, V Sepelak
Summary: The study reports the synthesis of rhombohedral Gd6UO12-delta through mechanochemical processing and annealing, showing a remarkable degree of cation antisite disorder and oxygen deficiency in the material.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xuefei Chen, Fuping Yuan, Hao Zhou, Xiaolei Wu
Summary: In this study, we observed extra diffuse scattering from CSRO in the [111] and [112] directions in a VCoNi MEA using electron diffraction. We successfully constructed the L1(1)-type structure motif for CSRO and derived the flat cuboid spatial shape of CSRO through diffractions under different zone axis. Furthermore, we demonstrated methods to identify CSRO in lattice images.
MATERIALS RESEARCH LETTERS
(2022)
Article
Chemistry, Physical
Kenji Iwase, Shuhei Ishida, Takashi Ueno, Kazuhiro Mori
Summary: This study investigated the residual hydrogen occupation mechanisms in MgZn2-type and CaCu5-type cells during the hydrogen absorption-desorption process. The results revealed the structural changes and deuterium occupation in NdNi3Dx and provided insights into the preferred deuterium sites in different cell types.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Geochemistry & Geophysics
Anne J. Whitworth, Helen E. A. Brand, Siobhan A. Wilson, Ian E. Grey, Natasha R. Stephen, Yesim Gozukara, Andrew J. Frierdich
Summary: This research investigates the occurrence of monoclinic symmetry in a natural natrojarosite sample using synchrotron powder X-ray diffraction, thermogravimetric analysis, and electron backscatter diffraction. The study reveals the presence of monoclinic symmetry in the natural natrojarosite, similar to synthetic monoclinic jarosite. The results also show spatial-structural variation within the sample, with areas of both monoclinic and rhombohedral natrojarosite coexisting. These findings suggest a more prevalent occurrence of monoclinic symmetry in natural jarosites than previously believed, which is significant for studying the crystal structure of jarosites.
AMERICAN MINERALOGIST
(2023)
Article
Chemistry, Physical
Nathan J. Szymanski, Zhengyan Lun, Jue Liu, Ethan C. Self, Christopher J. Bartel, Jagjit Nanda, Bin Ouyang, Gerbrand Ceder
Summary: Pair distribution function (PDF) analysis is a powerful technique for characterizing short-range order (SRO) in disordered materials. This study outlines an approach to model SRO using first-principles calculations based on the cluster-expansion formalism and validates it on neutron scattering data from two disordered rocksalt oxyfluorides. The results demonstrate the importance of considering local variations in site occupancies and bond lengths in accurately interpreting experimental PDF data.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Liu Yang, Xiaosong Jiang, Hongliang Sun, Tingfeng Song, Defeng Mo, Xue Li, Zhiping Luo
Article
Chemistry, Physical
Gibin George, Jacob Hayes, Candyce N. Collins, Jason E. Davis, Lei Yu, Yulin Lin, Jianguo Wen, Daryush Ila, Zhiping Luo
Summary: This study investigates the photoluminescence and cathodoluminescence characteristics of rare-earth-doped CaF2 nanoparticles and their composite monoliths with epoxy. The results show that the luminescence intensity increases as the particle size decreases for single-doped particles, but decreases for codoped particles. Additionally, Eu2+- and Tb3+-codoped CaF2 nanoparticles exhibit red emission.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Washat Ware, Tia Wright, Yimin Mao, Shubo Han, Jessa Guffie, Evgeny O. Danilov, Jeromy Rech, Wei You, Zhiping Luo, Bhoj Gautam
Summary: Research shows that tuning aggregation in polymer blends can optimize charge generation, which is beneficial for the design of highly efficient organic photovoltaic devices.
Review
Optics
Vineet Kumar, Zhiping Luo
Summary: This review article presents the recent advances in X-ray emission dynamics of inorganic scintillator materials, discussing the origin of scintillation and the factors influencing the decay process of different luminescence centers, focusing on the short-lived decay component. The study highlights three decay mechanisms in cross luminescence emission, exitonic emission, and dopant-activated emission.
Article
Chemistry, Physical
Sivasankara Rao Ede, Candyce N. Collins, Carlos D. Posada, Gibin George, Hui Wu, William D. Ratcliff, Yulin Lin, Jianguo Wen, Shubo Han, Zhiping Luo
Summary: The synthesis of SrCo-Fe-O oxides to enhance OER activity resulted in the discovery of Sr2Co1.5Fe0.5O6-delta as the best catalyst, demonstrating superior performance in water oxidation due to its unique intermediate structure and increased covalency of Co 3d and O 2p. This study highlights the importance of developing catalysts with specific structural features and chemical properties for improved hydrogen generation efficiency.
Article
Chemistry, Physical
Rui Shu, Xiaosong Jiang, Y. X. Zhang, Richard Wuhrer, Bing Liu, Hongliang Sun, Zhenyi Shao, Zhiping Luo
Summary: In this study, Mo-Cu-Zr ternary composites were reinforced with various types and contents of nano-carbon to find the optimal composition. The 0.8C + 0.2G-MCZ3 composite showed the best comprehensive properties, with a relative density, hardness and compressive strength of 99.7%, 343.6 HV and 953.5 MPa respectively. The synergetic effects and multiple strengthening mechanisms resulted in the improvement of the microstructure and properties of the composites.
Article
Nanoscience & Nanotechnology
Yuxiang Liu, Mingxiang Liu, Jianlei Zhang, Wei He, Zhiping Luo, Changjiang Song, Qijie Zhai
Summary: In this study, it was found that the addition of chromium had significant effects on the microstructure and mechanical properties of Fe-28Mn-9Al-1.2C alloy, with different chromium addition levels showing nonlinear impacts on yield strength and total elongation of the strips. Annealing treatment improved the yield strength of all strips, and the formation of Cr23C6 carbides at austenite grain boundaries could lower the ductility of the strips containing 9% chromium.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Zhiping Luo
Summary: This study used quantitative electron microscopy to investigate the crystalline structure of gamma-alumina and its transformation mechanism from boehmite, proposing a new tetragonal structure model and elucidating two transformation mechanisms. The experimental observations supported the reaction mechanism, which occurred through partial occupation of the dehydrated space by diffusion in the initial stage of the transformation.
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
(2021)
Article
Chemistry, Physical
Mingxiang Liu, Zhiming Li, Zhiping Luo, Changjiang Song, Qijie Zhai
Summary: In an Fe-10Cr alloy, the critical cooling rate of martensitic transformation decreases by one order of magnitude when cooling from 1300 degrees C compared to cooling from 1000 degrees C. This decrease is attributed to the precursor delta ->gamma phase transition during cooling from 1300 degrees C significantly reducing the non-chemical driving force of martensitic transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Gibin George, Navadeep Shrivastava, Tamela L. Moore, Caressia S. Edwards, Yulin Lin, Jianguo Wen, Zhiping Luo
Summary: In this study, high-aspect-ratio AWO(4) (A = Ba, Ca, Pb and Sr) nanofibers doped with Tb and Eu ions were synthesized and their performance in UV light detection was compared. The CaWO4:5Tb-5Eu nanofibers exhibited strong photoluminescence and cathodoluminescence emissions, making them a potential fluorescent probe for UV wavelength detection. However, similar results were not observed in nanofibers of other AWO(4) compounds. Additionally, the CL intensities from CaWO4:5Tb-5Eu nanofibers showed highly linear dependences on applied voltage and current, suggesting their potential use in radiation detection.
Article
Materials Science, Multidisciplinary
Menuka Adhikari, Navadeep Shrivastava, Starfari T. McClain, Chandra M. Adhikari, Burak Guzelturk, Rabi Khanal, Bhoj Gautam, Zhiping Luo
Summary: The halide Cs2HfF6 (CHF) possesses higher mass density and chemical stability for radiation detection compared to halides Cs2HfX6. Luminescence properties and energy transfer mechanisms of rare-earth-doped CHF materials are studied. Codoped CHF material shows stable emission and higher sensitivity to radiation energy.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Girja Mani Aryal, Krishna Prasad Kandel, Ram Kumar Bhattarai, Basant Giri, Menuka Adhikari, Alisha Ware, Shubo Han, Gibin George, Zhiping Luo, Bhoj Raj Gautam, Bhanu Bhakta Neupane
Summary: In this study, multiple material properties of handmade Lokta paper from Nepal were measured and analyzed. The findings revealed that the papers are lightweight with intermediate to high strength, and the tensile strength is significantly higher along the length direction. Features of cellulose, hemicellulose, and lignin were observed in FTIR spectra, and crystalline and amorphous phases were identified in XRD data. Electron microscopy images showed a cross-linked network of fibers contributing to strength and durability.
Article
Materials Science, Multidisciplinary
Kasci D. Pelucarte, Tashi A. Hatchell, Gibin George, Sivasankara Rao Ede, Menuka Adhikari, Yulin Lin, Jianguo Wen, Zhiping Luo, Shubo Han
Summary: In this study, porous La-Sr-Co-Ni-O nanofibers with a perovskite structure were successfully prepared and utilized to develop a nonenzymatic electrochemical glucose biosensor. The biosensor exhibited high sensitivity and excellent stability towards glucose, while showing low interference response to other biomolecules. This research has great potential for practical applications in clinical testing.
MATERIALS ADVANCES
(2022)
Review
Chemistry, Physical
Sivasankara Rao Ede, Zhiping Luo
Summary: This review focuses on different doping strategies and associated OER mechanisms of state-of-the-art catalysts for improving the kinetics of the oxygen evolution reaction in electrochemical water splitting. Various doping methods have been proposed to enhance the efficiency of OER catalysts, with different materials types (oxides, non-oxides, and carbon-based catalysts) showing unique effects on the OER mechanism. Combined experimental and theoretical research provides guidelines for designing efficient catalysts.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Materials Science, Multidisciplinary
Vineet Kumar, Gibin George, Jacob Hayes, Yulin Lin, Burak Guzelturk, Jianguo Wen, Zhiping Luo
Summary: The study successfully synthesized cube-shaped nanocrystals doped with rare-earth ions via a hydrothermal method. The dopants on two different Ba2+ sites in the host lattice exhibited site-dependent luminescence characteristics. In the codoped sample, Eu3+ and Tb3+ were observed to preferably occupy two different sites in the host lattice.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.