Article
Materials Science, Multidisciplinary
Cheng-Sao Chen, Pin-Yi Chen, Wei Sea Chang, Carvyn Blaise, Yi Lin Hsieh, R. R. Chien, V. Hugo Schmidt, Yi-Shin Jou, Chi-Shun Tu
Summary: This study investigates the nano-to-micro domain structure, polarization switching, and electromechanical mechanisms in lead-free perovskite bismuth ferrite near the morphotropic phase boundary. The coexistence of ferroelectric and antiferroelectric symmetries, along with the presence of polar nano-regions and domain boundaries, were identified as the system crossed the MPB. The O 2p-Fe 3d and O 2p-Bi 6s(p) orbital hybridization were found to play key roles in the evolution of structural distortion, polarization, and electromechanical properties.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Song Zhou, Lei Liao, Lan Chen, Baojie Feng, Xiaoyue He, Xuedong Bai, Chuangye Song, Kehui Wu
Summary: This study demonstrates the possibility of maintaining stable in-plane polarization in an extremely thin Bi2WO6 film by using a perfectly lattice-matched NdGaO3 (110) substrate. The residual polarization in this ultrathin film is attributed to the crystal stability of the Bi-O octahedral framework against structural distortions. These findings suggest the potential of the Bi2WO6/NdGaO3 (110) system as a platform for designing low-energy consumption, nonvolatile ferroelectric memories.
Article
Chemistry, Multidisciplinary
Yong-Jun Kwon, Youngki Yeo, Min-Su Kim, Yong-Jin Kim, Heung-Sik Park, Jaegyu Kim, Si-Young Choi, Chan-Ho Yang
Summary: Topological textures of ferroelectric polarizations have potential applications in future information technology. However, energy losses and deviations from stability can affect the symmetry and shape of these textures. In this study, we investigated the domain structure of bismuth tungsten oxide thin films grown on SrTiO3 substrates using advanced microscopy techniques. We discovered a hidden phase with a different polarization orientation that promotes the formation of flux closure domains, bringing us one step closer to an isotropic two-dimensional polar material.
Article
Materials Science, Ceramics
Anantha P. Bhat, Ranjith Ramadurai
Summary: Strain-mediated coupling between the magnetic and electrically ordered phases is important in magnetoelectric nano-composites. This study explores a method to analyze and quantify interfacial strain using grazing angle scan in a ME composite optimized for a specific microstructure. The strain around the interface of CoFe2O4 - 0.93Na(0.5)Bi(0.5)TiO(3) - 0.07BaTiO(3) was observed to dominate over a spatial region of about 20-30 nm away from the interface. The strain experienced by the ferroelectric layer restricts polarization rotation and domain wall motion.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hyun Wook Shin, Jong Yeog Son
Summary: In this study, the ferroelectric switching and current characteristics of BFO nanocubes were investigated, revealing their potential as storage media for ferroelectric polarization information.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Nan Liu, Yi Cao, Yun-Long Tang, Yin-Lian Zhu, Yu-Jia Wang, Jia-Qi Liu, Heng Zhang, Chang-Ji Li, Si-Rui Zhang, Bing Yang, Hai-Ning Li, Xiu-Liang Ma
Summary: Engineering regular crystallographic facet arrays on a large scale is useful for optimizing photophysical properties of optoelectronic materials. In this study, textured BLFO film surfaces with nanosquare arrays composed of {001} and {110} crystallographic facets were achieved using a thermal etching method. The faceted samples exhibited significantly enhanced photocurrent signals, and the {110} surface showed highly dispersive electronic structure, indicating better carrier transport.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Marti Checa, Xin Jin, Ruben Millan-Solsona, Sabine M. Neumayer, Michael A. Susner, Michael A. McGuire, Andrew O'Hara, Gabriel Gomila, Petro Maksymovych, Sokrates T. Pantelides, Liam Collins
Summary: This study uses quantitative scanning probe microscopy methods combined with density functional theory to explore the nanoscale variability in the dynamic functional properties of the ferroelectric material CIPS and the nonferroelectric material IPS. It reveals evidence of fast ionic transport that mediates a significant out-of-plane electromechanical response of the CIPS surface in the paraelectric phase. It also recovers the local dielectric behavior during the ferroelectric-paraelectric phase transition and demonstrates the tunable conductivity enhancement at the CIPS/IPS interface.
Article
Engineering, Electrical & Electronic
Jihwan Jeong, Junsik Mun, Saikat Das, Jinkwon Kim, Jeong Rae Kim, Wei Peng, Miyoung Kim, Tae Won Noh
Summary: In this study, BWO thin films were grown on substrates using pulsed laser deposition, with the ferroelectric properties characterized using STEM and PFM techniques. It was found that the oxygen gas pressure during growth mainly determined the phase stability of the films, while the growth temperature had a minor influence. Atomically resolved STEM study revealed a collective in-plane polar off-centering displacement of W atoms, with the estimated spontaneous polarization value in good agreement with the bulk value. The study also identified the presence of type-I and type-II domains in the pristine film, forming a multidomain state.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xiaojun Qiao, Wenping Geng, Jianwei Meng, Yao Sun, Kaixi Bi, Yun Yang, Junbin Yu, Jian He, Xiujian Chou
Summary: This study investigates the domain dynamics and temperature stability of lead-free ferroelectric thin films, demonstrating their stable ferroelectric states and good temperature endurance. The results provide valuable insights for potential applications in electrical storage devices, especially in high-temperature environments.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
Anelia Kakanakova-Georgieva, Filippo Giannazzo, Giuseppe Nicotra, Ildiko Cora, Gueorgui K. Gueorguiev, Per O. A. Persson, Bela Pecz
Summary: This study successfully demonstrated the formation of a novel 2D indium oxide, achieved through targeted intercalation and deposition of indium atoms at the graphene/SiC interface. A unique structural configuration with two sub-layers of indium atoms was observed, and bonding of oxygen atoms to indium atoms was confirmed. The 2D indium oxide exhibited a wide bandgap energy of 4.1 eV as estimated by conductive atomic force microscopy measurements.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Keisuke Shimizu, Hajime Hojo, Masaki Azuma
Summary: The crystal structures and piezoelectric properties of gallium-substituted BiFeO3 thin films were investigated, showing a transition from rhombohedral to monoclinic phase with higher piezoelectric response. The unique behavior of the (101)-oriented monoclinic phase was attributed to the sensitivity of the a- and b-axes to polarization rotation.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Ceramics
Kevin Pachuta, Halyna Volkova, Benjamin Hirt, Marie-Helene Berger, Emily Pentzer, Alp Sehirlioglu
Summary: Two-dimensional materials have attracted attention for their unique properties, and research into their processing and scalability is crucial for next-generation technologies. A liquid-phase exfoliation method has been developed to produce multilayer cobalt oxide nanosheets in pH-neutral aqueous solutions, with their size, thickness, and morphology confirmed using microscopy techniques.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Materials Science, Multidisciplinary
Y. J. Wang, Y. L. Tang, Y. L. Zhu, X. L. Ma
Summary: Ferroelectric crystals with switchable polar structures have potential applications in information storage. Nanoscale ferroelectrics exhibit various exotic domain configurations and polar topologies, which can result in high-density memory bits. However, stabilizing polar topologies in ferroelectric materials, especially in nanoscale, is a significant challenge due to the pronounced coupling between polarizations and spontaneous strains.
Article
Chemistry, Multidisciplinary
Abinash Kumar, Konstantin Klyukin, Shuai Ning, Cigdem Ozsoy-Keskinbora, Mikhail Ovsyanko, Felix van Uden, Ruud Krijnen, Bilge Yildiz, Caroline A. Ross, James M. LeBeau
Summary: YFeO3 thin films exhibit changes in antiphase boundaries under the influence of Y-Fe antisite defects and strain, displaying polar and bistable characteristics. Density functional theory demonstrates that the presence of Fe-Y antisites significantly decreases the switching barrier.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Crystallography
Qiyuan Wu, Yanling Song, Caihong Jia, Zhaomeng Gao, Weifeng Zhang
Summary: The research found that Nd doping concentration has a significant impact on the surface morphology, crystal structure, and electrical properties of BNFMO films. Different Nd doping concentrations lead to different crystalline structures in BNFMO thin films and affect the resistive switching effect. Additionally, the ferroelectric photovoltaic effect is also regulated by ferroelectric polarization.
Article
Chemistry, Multidisciplinary
Yulian Yao, Aaron Naden, Mengkun Tian, Sergey Lisenkov, Zachary Beller, Amit Kumar, Josh Kacher, Inna Ponomareva, Nazanin Bassiri-Gharb
Summary: Antiferroelectric materials, such as PbZrO3, offer exceptional energy storage capacity and other outstanding properties. However, challenges in processing phase pure PbZrO3 have hindered the study of the undoped composition and understanding of its phase transitions. By leveraging PbZrO3 thin films, a room-temperature ferrielectric phase with high dielectric tunability and ultrahigh strains has been observed, calling for a re-evaluation of the fundamental science of antiferroelectricity in this archetypal material.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Byung-wook Ahn, Jungyong Kim, Seungsu Kang, Suar Oh, Giheon Kim, Woo-Sung Jang, Eunju Yeo, Young-Min Kim, Young Chul Choi, Dong-soon Kwag, Seong Chu Lim
Summary: We characterized carbonaceous nanostructures produced by electrical arcing of current-carrying Cu wires in two different ways. Analysis of the two carbon materials revealed significant differences in chemical binding, element composition, carbon diffusion into Cu wire, and relative distribution of carbon. These distinctions can be utilized to decipher the cause of unsolved fires by examining the carbon soot resulting from different arcing conditions.
Article
Engineering, Environmental
Jaekwang Kim, Ilbok Lee, Young-Hoon Kim, Joong Ho Bae, Keebum Hwang, Hyunchul Kang, Jae-Hyun Shim, Ji-Soo Kim, Chul Wan Park, Young-Min Kim, Songhun Yoon
Summary: This study demonstrates the preparation of a novel Ni-rich cathode material with an isolated porous layer and its application in lithium-ion batteries with an extended cut-off potential of 4.5V. By using intermittent addition of Al salt during co-precipitation, the formation of an isolated porous layer inside the active material particles is achieved, maintaining the integrity and spherical shape. Under the severe cut-off potential of 4.5V, the volume expansion/contraction and mechanical stress are significantly reduced, resulting in high initial capacity and excellent capacity retention. Microtomic transmission electron microscope analysis shows that the porosity of the particles is maintained at a low level even after cycling under 4.5V cut-off voltage.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Applied
C. J. McCluskey, A. Kumar, A. Gruverman, I. Luk'yanchuk, J. M. Gregg
Summary: Ferroelectric domain walls usually have enhanced electrical conductivity, but in lead germanate, head-to-head and tail-to-tail walls are electrically insulating. Recent studies suggest that this is because polar divergence is obviated by domain bifurcation and suspected local dipolar rotation. A study using tomographic piezoresponse force microscopy on triglycine sulfate confirms that mutual domain bifurcation and suspected local dipolar rotation are not unique to lead germanate and may be widely present in other uniaxial ferroelectrics.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Seung Su Kang, Ji Yeon Kim, Wooseon Choi, Byungwook Ahn, Suar Oh, Giheon Kim, Eunji Sim, Young-Min Kim, Won Seok Kim, Young Chul Choi, Seong Chu Lim
Summary: Recently, carbon materials have been used in the core of metal wires to reduce weight. The hybridization of carbon with metal for creating carbon-based metal wires is achieved through different approaches. Depending on the grain size, the transport behavior of Ni-coated carbon fibers can be either dominated by phonon-driven electron scattering transport or impurity-related variable range hopping transport, resulting in positive or negative temperature coefficient of resistance. Control of the plating condition and surface morphology of carbon fibers can modulate the metal-insulator transition.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Physics, Applied
Anna N. Morozovska, Eugene A. Eliseev, Mykola E. Yelisieiev, Yulian M. Vysochanskii, Dean R. Evans
Summary: Using the Landau-Ginzburg-Devonshire approach, the stress-induced transformations of polarization switching in CuInP2S6 nanoparticles of different shapes were studied. The semiconducting properties of the nanoparticles were modeled using a surface-charge layer with a small effective screening length due to the field effect. The results showed a strong and unusual influence of hydrostatic pressure on polarization switching, hysteresis loop shape, magnitude of remanent polarization, and coercive fields.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Denis Alikin, Kiryl Zakharchuk, Wenjie Xie, Konstantin Romanyuk, Maria J. Pereira, Blanca I. Arias-Serrano, Anke Weidenkaff, Andrei Kholkin, Andrei V. Kovalevsky, Alexander Tselev
Summary: Thermoelectric conversion could play a significant role in future energy technologies. Oxide-based thermoelectric composite ceramics have attracted attention as a promising approach to control electrical and thermal conductivity for improved thermoelectric performance. However, the variability of composite properties, even with identical preparation routes, requires detailed studies of thermal transport at the local scale in order to be understood.
Article
Chemistry, Physical
Sang-Hyeok Yang, Eun-Byeol Park, Sung Yong Cho, Yun Sik Kang, Hyeon-Ah Ju, Yerin Jeon, Daehee Yang, Sung-Dae Yim, Sungchul Lee, Young-Min Kim
Summary: Measuring the morphological distribution variation of Pt-based catalyst particles on supports using transmission electron microscopy is important for understanding fuel cell performance degradation and designing durable electrocatalysts. However, manual analysis of large image datasets is time-consuming and subjective. To overcome this, a deep learning-assisted method based on an attention-aided deep convolutional neural network is proposed for the automated interpretation of metal catalyst nanoparticle images. This method allows for rapid measurement and quantitative evaluation of morphological changes, with statistical significance, of Pt/Co nanoparticles on a porous support.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Physical
Kyle P. Kelley, Anna N. Morozovska, Eugene A. Eliseev, Yongtao Liu, Shelby S. Fields, Samantha T. Jaszewski, Takanori Mimura, Sebastian Calderon, Elizabeth C. Dickey, Jon F. Ihlefeld, Sergei V. Kalinin
Summary: Ferroelectricity in binary oxides such as hafnia and zirconia has attracted attention due to unconventional physical mechanisms and potential integration into semiconductor workflows. Recent research suggests that factors such as electrochemical boundary conditions and strain heavily influence the ferroelectric properties. The interplay between ferroelectric and structural instabilities, coupled with non-local screening, explains the emergence of these properties.
Article
Physics, Applied
Anna N. Morozovska, Maksym V. Strikha, Kyle P. Kelley, Sergei V. Kalinin, Eugene A. Eliseev
Summary: This study develops an effective model to describe the charge-polarization coupling behavior between a thin film and graphene, and explains the nonlinear relationship between Landau expansion coefficients and film thickness and chemical composition. The research finds that the polarization of the film strongly influences the conductivity of graphene, and the charge distribution in graphene can be controlled by manipulating the film's electric field dependence.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Alexander C. Tyner, Shouvik Sur, Danilo Puggioni, James M. Rondinelli, Pallab Goswami
Summary: In this study, it is discovered that three-dimensional stable Dirac semimetals demonstrate the quantum spin Hall effect, with bound states on n-fold symmetric momentum planes. These planes support the same non-Abelian Berry flux and exhibit identical topological response.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Sean Koyama, James M. Rondinelli
Summary: In this study, a new type of persistent spin texture (PST) material is discovered, called symmetry-assisted PSTs, which can enhance the performance of spintronic devices. Chemical substitution can be used to tune the properties of these materials, such as spin lifetime. Additionally, it is found that existing two-dimensional models are insufficient to fully describe the spin texture state in these materials, indicating the need for higher-order models.
Article
Materials Science, Multidisciplinary
Xue-Zeng Lu, James M. Rondinelli
Summary: Through electronic structure calculations and algebraic representation analysis, we have discovered that high-quality persistent spin textures can be hidden in complex ternary layered and perovskite structures with large electric polarizations, offering potential for future quantum microelectronic devices.
Article
Automation & Control Systems
Sheryl Sanchez, Yongtao Liu, Jonghee Yang, Sergei V. Kalinin, Maxim Ziatdinov, Mahshid Ahmadi
Summary: In recent years, laboratory automation and high-throughput synthesis and characterization have become increasingly important in the research community. To effectively analyze the large datasets and extract system properties, suitable machine learning techniques, such as the variational autoencoder (VAE) approach, are needed. This study explores the binary library of metal halide perovskite microcrystals using low-dimensional latent representations of photoluminescence spectra. The combination of translationally invariant variational autoencoders (tVAEs) and conditional autoencoders (cVAEs) allows for a deeper understanding of the underlying mechanisms within the data.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Jesi R. Maguire, Conor J. Mccluskey, Kristina M. Holsgrove, Ahmet Suna, Amit Kumar, Raymond G. P. Mcquaid, J. Marty Gregg
Summary: We have used high-voltage Kelvin probe force microscopy to map the electrical potential distribution along curved current-carrying conducting domain walls in ferroelectric lithium niobate thin films. We found that the potential profiles and electric fields can be explained by variations in wall resistivity alone, without invoking additional physical phenomena. This is important for domain-wall nanoelectronics.
