Article
Chemistry, Multidisciplinary
Nicola Manca, Federico Remaggi, Alejandro E. Plaza, Lucia Varbaro, Cristina Bernini, Luca Pellegrino, Daniele Marre
Summary: This article discusses the potential of using complex oxides to fabricate high-sensitivity nanomechanical sensors, exploring the performance parameters of suspended micro-bridges and discussing fundamental aspects related to stress state and Q factors. The experiments demonstrate that complex oxides can achieve high-Q-factor mechanical resonators, paving the way for the development of MEMS/NEMS sensors.
Article
Materials Science, Multidisciplinary
Catherine Zhou, Gregory S. Rohrer, Paul A. Salvador
Summary: Density functional theory (DFT) was used to calculate thermodynamic parameters related to epitaxial polytypes during nucleation of (Sr/Ba)MnO3 on (100), (110), and (111) cubic (Sr/Ba)TiO3 substrates. The results showed that 3 ������ SrMnO3 becomes less stable when moving from (100) to (110) to (111) orientations, consistent with experimental observations. The study also discussed the different thermodynamic contributions to polytype stability and assessed the feasibility of stabilizing a 3 ������ BaMnO3 film on (Sr/Ba)TiO3 substrates using DFT results.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jacqueline M. Boergers, Joe Kler, Ke Ran, Elizabeth Larenz, Thomas E. Weirich, Regina Dittmann, Roger A. De Souza
Summary: (English Summary:)
The (La,Sr)MnO3+delta oxide displays accelerated oxygen diffusion along dislocations, potentially due to the presence of oxygen vacancies within space-charge tubes along the dislocations. The results show significantly higher oxygen diffusivities and activation enthalpies along dislocations compared to the bulk, suggesting that oxygen diffusion occurs faster within space-charge tubes at the dislocations.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Nathalie Jedrecy, Vishal Jagtap, Christian Hebert, Loic Becerra, David Hrabovsky, Antoine Barbier, Xavier Portier
Summary: The study demonstrates a bipolar resistance switch in the multiferroic BTO/LSMO system, highlighting the crucial role of ionic exchanges and redox processes at interfaces in ferroelectric bound charge screening and resistive switching.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Ceramics
Na Li, Liping Sun, Qiang Li, Tian Xia, Lihua Huo, Hui Zhao
Summary: The introduction of CBO oxide can reduce the sintering temperature of LSM-based cathode and improve its electrochemical performance at intermediate temperatures of 500-700 degrees C.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Physics, Applied
Haihua Hu, Yuke Li, Yihao Yang, Wenxin Lv, Han Yu, Wencai Lu, Yuehang Dong, Zheng Wen
Summary: This study demonstrates the realization of long-term plasticity and synapse emulations in Ag/SrTiO3/(La,Sr)MnO3 memristors with thin SrTiO3 active layers, allowing for efficient control of Ag+ ion migration and continuous conductance modulation. In the high resistance state, the devices exhibit excellent spike-timing-dependent plasticity characteristics and show sensitive responses to electrical stimuli at low voltages and fast speeds. Additionally, supervised learning simulations using spike-timing-dependent plasticity results in Ag/SrTiO3/(La,Sr)MnO3-based neural networks achieved a high accuracy rate of 95.5% for recognizing handwritten digits.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Yuanhao Zhang, Jibo Xu, Yahui Yu, Weijie Zheng, Zhiyu Xu, Lingzhi Lu, Ziyu Wang, Chaojing Lu, Zheng Wen
Summary: This article investigates the effect of oxygen vacancies on the resistance change behavior of Pt/Pb(Zr,Ti)O-3/(La,Sr)MnO3 tunnel junctions. The results show that, under polarization reversal modulation, the relay resistance-voltage relationship is counterclockwise, while it becomes clockwise with the introduction of oxygen vacancies. In addition, the memristive behavior of ferroelectric-controlled Pt/Pb(Zr,Ti)O-3/(La,Sr)MnO3 tunnel junctions is also studied.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Jongchol Cha, Jinhyok Jon, Gwangwon Ri, Wonhyok Thae
Summary: The influence of potassium doping on the magnetic and magnetocaloric effect of perovskite-type manganese oxides has been investigated. The results show that with increasing potassium content, the maximum magnetization and Curie temperature decrease, which is advantageous for magnetic refrigeration applications at sub-room and near-room temperature.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Chemistry, Physical
Jun Li, Yujun Zhang, Kai Zhao, San Ping Jiang, Min Chen
Summary: In this paper, the authors study the characteristics of chromium evaporation, oxide scale growth, and deposition of chromium on the oxygen reduction reaction (ORR) on (La,Sr)MnO3 (LSM) cathode in intermediate-temperature solid oxide fuel cells. The results indicate that the volatilization of chromium is influenced by the composition and morphology of the oxide scale, and the deposition of chromium on the LSM cathode degrades the electrochemical activity of the ORR. These findings provide insights into the mechanism of chromium poisoning in intermediate-temperature conditions.
JOURNAL OF POWER SOURCES
(2023)
Article
Nanoscience & Nanotechnology
Anshu Gaur, S. Srinath
Summary: The dielectric and electrocaloric properties of sol-gel synthesized BTZ and LSM composite in 80:20 molar ratio were investigated. Analysis based on the electric modulus M* was used to differentiate the orientational and interfacial/carrier contributions. The results suggest that M* is a more suitable parameter to consider for ferroelectric-ferromagnetic composites.
Article
Materials Science, Ceramics
Eun-Hui Kim, Sam-Haeng Lee, Byeong-Jun Park, Jeong-Eun Lim, Myung-Gyu Lee, Joo-Seok Park, Byung-Cheul Kim, Sung-Gap Lee
Summary: La-0.7(Sr0.3-xCax)MnO3 (0.1 <= x <= 0.25) ceramics were prepared by solid-state sintering. With the increase of Ca content, the sintered densities decreased, but all specimens exhibited excellent NTCR properties.
JOURNAL OF CERAMIC PROCESSING RESEARCH
(2021)
Article
Chemistry, Inorganic & Nuclear
Mylene Hendrickx, Yawei Tang, Emily C. Hunter, Peter D. Battle, Joke Hadermann
Summary: The three polycrystalline samples of A(2)LaFe(2)SbO(9) perovskites (A = Ca, Sr, Ba) exhibit structural and compositional inhomogeneities, with Ca being monophasic while Sr and Ba show differences in octahedral filling patterns and B cation ordering. The temperature dependence of magnetic properties in each sample is also discussed.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Physical
Weiqu Chen, Haoxun Luo, Zimin Chen, Yanli Pei, Gang Wang, Xing Lu
Summary: This letter reports the demonstration of epsilon-phase gallium oxide (epsilon-Ga2O3) based MOSFETs for the first time. The high crystalline quality of the epilayer was confirmed, and fluorine atoms were incorporated to decrease the sheet resistance. The MOSFETs showed a high output current density and a significant carrier accumulation near the film surface, indicating the potential of epsilon-Ga2O3 based electronics for high-speed and high-power applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Jose D. Gouveia, Angel Morales-Garcia, Francesc Vines, Jose R. B. Gomes, Francesc Illas
Summary: High-throughput analysis based on density functional simulations highlights the feasible epitaxial growth of MXenes by alternating nitrogen and metal adlayers. Exhaustive analysis of thermodynamic and kinetic thresholds at different critical steps reveals the potential to expand, control, and tune the composition, width, and structure of the MXene family.
Article
Chemistry, Multidisciplinary
Jose D. Gouveia, Angel Morales-Garcia, Francesc Vines, Jose R. B. Gomes, Francesc Illas
Summary: A high-throughput analysis based on density functional simulations confirms that MXenes can be epitaxially grown by alternating nitrogen and metal adlayers. The study analyzes various thermodynamic and kinetic thresholds of key steps in the epitaxial growth process, providing insights into the N-2 fixation, dissociation, and stability of metal adlayers.
Article
Chemistry, Multidisciplinary
Xin Wu, Danpeng Gao, Xianglang Sun, Shoufeng Zhang, Qi Wang, Bo Li, Zhen Li, Minchao Qin, Xiaofen Jiang, Chunlei Zhang, Zhuo Li, Xinhui Lu, Nan Li, Shuang Xiao, Xiaoyan Zhong, Shangfeng Yang, Zhong'an Li, Zonglong Zhu
Summary: In this study, a simple design strategy of polymer hole-transporting materials (HTMs) is reported, which can modulate the wettability and promote the anchoring by introducing pyridine units into the polyarylamine backbone, resulting in efficient and stable inverted perovskite solar cells (PVSCs).
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Long Li, Dongsheng Song, Weiwei Wang, Fengshan Zheng, Andras Kovacs, Mingliang Tian, Rafal E. Dunin-Borkowski, Haifeng Du
Summary: This study reports the direct observation of transformations from a chiral soliton lattice (CSL) to magnetic skyrmions in a nanostripe of the monoaxial chiral magnet CrNb3S6 using Lorentz transmission electron microscopy. The findings show that under the presence of an external magnetic field, helical spin structures first transform into CSLs and then evolve into isolated elongated magnetic skyrmions. These results contribute to the enrichment of topological magnetic states and their transitions, and stimulate further exploration of their emergent electromagnetic properties.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ping-Luen Ho, Zhihao Huang, Lei Jin, Si-Young Choi, Rafal E. Dunin-Borkowski, Joachim Mayer, Shik Chi Edman Tsang, Xiaoyan Zhong
Summary: Aberration-corrected analytical transmission electron microscopy (TEM) is used to determine the atomic-scale cation order in a nanosized Sr3Fe2ReO9 phase, revealing tripled-layered repeats of Fe and Re cations along [111](pc) and an ordering vector of 1/3[111]*. Density functional theory calculations based on a relaxed theoretical model consistent with the experimental images determine the magnetic ground states and exchange parameters of the newly discovered Sr3Fe2ReO9 phase, where nearest-neighbour Fe and Re cations are coupled antiferromagnetically.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Michael Oberaigner, Alexander Clausen, Dieter Weber, Gerald Kothleitner, Rafal E. Dunin-Borkowski, Daniel Knez
Summary: Position averaged convergent beam electron diffraction (PACBED) is a convenient and precise technique for determining thickness in a scanning transmission electron microscope. The method can be automated using convolutional neural networks (CNNs) to enhance speed and ease of application, but simulation and training can be computationally expensive. To simplify the process, a server-based database of pretrained CNN models accessed through a web service is proposed. A working prototype with a shared CNN database for three material systems demonstrates the usability of the method, allowing microscope operators to determine specimen thickness quickly and reproducibly during a session, without prior knowledge of machine learning or multislice modeling. The service can also be integrated into other software and workflows through the API.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Fengshan Zheng, Vadim Migunov, Jan Caron, Hongchu Du, Giulio Pozzi, Rafal E. Dunin-Borkowski
Summary: We demonstrate the quantitative 3D mapping of charge density and electric field in an electrically biased carbon fiber nanotip with a spatial resolution of approximately 5 nm using electron holographic tomography in the transmission electron microscope combined with model-based iterative reconstruction. This approach can be extended to study various nanoscale materials and devices.
Article
Materials Science, Multidisciplinary
Andras Kovacs, Nithin B. Venkataraman, Varun Chaudhary, Sriswaroop Dasari, Thibaud Denneulin, R. V. Ramanujan, Rajarshi Banerjee, Rafal E. Dunin-Borkowski
Summary: The microstructural features significantly affect the coercivity of magnetic alloys. While the influence of homophase boundaries on magnetic domain wall pinning is well understood, the role of heterophase interfaces on domain wall motion is complex and not well known. This study used advanced electron microscopy techniques to reveal the dramatic changes in the magnetization reversal process in an Al0.3CoFeNi magnetic complex concentrated alloy (CCA) and its impact on coercivity. The heterophase FCC/BCC interfaces were found to have a stronger effect on coercivity compared to isostructural chemically ordered/disordered interfaces, providing valuable insights for the rational design of microstructure in magnetic alloys.
Article
Chemistry, Multidisciplinary
Yizhe Liu, Xintong Li, Shoufeng Zhang, Zilong Wang, Qi Wang, Yonghe He, Wei-Hsiang Huang, Qidi Sun, Xiaoyan Zhong, Jue Hu, Xuyun Guo, Qing Lin, Zhuo Li, Ye Zhu, Chu-Chen Chueh, Chi-Liang Chen, Zhengtao Xu, Zonglong Zhu
Summary: A molecularly engineered MOF system based on mercaptan-metal links has been designed, demonstrating excellent electroconductivity and efficient electrocatalytic oxygen evolution reaction (OER) performance.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Maurice Vennewald, Nina Michelle Sackers, Andree Iemhoff, Isabella Kappel, Claudia Weidenthaler, Ansgar Meise, Marc Heggen, Rafal E. Dunin-Borkowski, Luke Keenan, Regina Palkovits
Summary: Single-atoms on carbon-nitrogen supports are considered catalysts for various reactions, but it's uncertain if these species or subnanometer clusters formed during reactions are the active species. This study investigates the behavior of palladium single-atoms on graphitic carbon nitride during ethylene hydrogenation and H2-D2 exchange. The results suggest that palladium aggregates to clusters at 100 degrees C in the presence of ethylene and hydrogen, and these clusters are the active species in catalytic reactions. This research highlights the importance of analyzing the dynamics of catalysts during reactions to identify the active species and understand the influence of gas atmosphere on metal speciation.
JOURNAL OF CATALYSIS
(2023)
Article
Materials Science, Multidisciplinary
S. Shuang, G. J. Lyu, D. Chung, X. Z. Wang, X. Gao, H. H. Mao, W. P. Li, Q. F. He, B. S. Guo, X. Y. Zhong, Y. J. Wang, Y. Yang
Summary: In this study, we developed a series of medium-entropy alloys (MEAs) with high strength, superior fracture toughness, and ultra-high corrosion resistance. Interestingly, our MEAs exhibit an unusual anti-corrosion behavior as their corrosion resistance increases with increasing acidity. This behavior can be attributed to the surface chemical complexity of our MEAs, which facilitates the formation of metastable medium entropy passive films.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jorg Schoepf, Arsha Thampi, Peter Milde, Dmytro Ivaneyko, Svitlana Kondovych, Denys Y. Kononenko, Lukas M. Eng, Lei Jin, Lin Yang, Lena Wysocki, Paul H. M. van Loosdrecht, Kornel Richter, Kostiantyn Yershov, Daniel Wolf, Axel Lubk, Ionela Lindfors-Vrejoiu
Summary: Ferromagnetic La0.7Sr0.3Mn1-xRuxO3 epitaxial multilayers with controlled variation of the Ru/Mn content were synthesized to investigate the possibility of generating a Dzyaloshinskii-Moriya interaction. Magnetic stripe domains separated by Neel-type domain walls and small Neel skyrmions were observed using magnetic force microscopy and Lorentz transmission electron microscopy. These findings are consistent with micromagnetic modeling, suggesting the existence of a sizable Dzyaloshinskii-Moriya interaction arising from inversion symmetry breaking and strain effects.
Review
Materials Science, Multidisciplinary
Knut W. Urban, Juri Barthel, Lothar Houben, Chun-Lin Jia, Lei Jin, Markus Lentzen, Shao-Bo Mi, Andreas Thust, Karsten Tillmann
Summary: Transmission electron microscopy is a crucial tool for studying the structure and properties of materials at atomic resolution. It allows for high spatial resolution and enables the correlation between microstructure and macroscopic properties. With the development of aberration-corrected electron optics, it became possible to perform picometer-scale measurements and chemical analyses. This paper aims to introduce this new type of electron microscopy, discuss its implications, applications, and limitations in materials science, and provide access to relevant literature.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Enzo Rotunno, Simone Gargiulo, Giovanni M. Vanacore, Chen Mechel, Amir H. Tavabi, Rafal E. Dunin-Borkowski, Fabrizio Carbone, Ivan Madan, Stefano Frabboni, Tugrul Guner, Ebrahim Karimi, Ido Kaminer, Vincenzo Grillo
Summary: Entanglement and correlation play a crucial role in quantum mechanics and have been successfully applied in optics for ghost imaging. In this study, we propose a similar scheme in electron microscopy, which exploits the correlation between electrons and collective mode excitations in a sample. This concept allows us to form an image of the sample on an electron camera without direct illumination, enabling high-resolution imaging beyond the wavelength of collective modes.
Article
Chemistry, Inorganic & Nuclear
Georgia Gkouzia, Damian Guenzing, Ruiwen Xie, Teresa Wessels, Andraas Kovacs, Alpha T. N'Diaye, Maïrton Major, J. P. Palakkal, Rafal E. Dunin-Borkowski, Heiko Wende, Hongbin Zhang, Katharina Ollefs, Lambert Alff
Summary: This study investigates the effect of copper substitution on the magnetic properties of SmCo5 thin films synthesized by molecular beam epitaxy. The results show that copper substitution not only stabilizes the formation of the SmCo5 structure but also enhances magnetic anisotropy and coercivity. X-ray magnetic circular dichroism and scanning transmission electron microscopy reveal the nanoscale inhomogeneities in the distribution of copper and cobalt.
INORGANIC CHEMISTRY
(2023)