Article
Materials Science, Multidisciplinary
Xiaozhe Yin, Chao Chen, Zhen Fan, Minghui Qin, Min Zeng, Xubing Lu, Guofu Zhou, Xingsen Gao, Deyang Chen, Jun-Ming Liu
Summary: By utilizing strain engineering and chemical doping, the coexistence of multiple morphotropic phase boundaries (multi-MPBs) in highly strained La-doped BiFeO3 thin films has been demonstrated. The reversible switching of these multi-MPBs can be achieved by applying an electric field, leading to enhanced electromechanical coupling response compared to pure BiFeO3. This discovery opens up a new field for obtaining high-performance piezoelectric materials.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
A. Pakalniskis, R. Skaudzius, D. V. Zhaludkevich, A. L. Zhaludkevich, D. O. Alikin, A. S. Abramov, T. Murauskas, V. Ya. Shur, A. A. Dronov, M. V. Silibin, A. Selskis, R. Ramanauskas, A. Lukowiak, W. Strek, D. V. Karpinsky, A. Kareiva
Summary: In this study, samarium substituted bismuth ferrite ceramics were prepared by sol-gel synthesis method and studied using various microscopic techniques to investigate the evolution of crystal structure across the morphotropic phase boundary region. The compounds exhibited structural transitions from polar active rhombohedral phase to anti-polar orthorhombic phase and then to non-polar orthorhombic phase within a specific concentration range. The results revealed a coexistence of different structural phases in the compounds, with a notable difference in the concentration range ascribed to the morphotropic phase boundary estimated by microscopic measurements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Shuai Cheng, Boping Zhang, Shengjie Ai, Hongbao Yu, Xin Wang, Jiahao Yang, Changrong Zhou, Jingtai Zhao, Guanghui Rao
Summary: The addition of Bi0.5Na0.5TiO3 in BiFeO3-BaTiO3 ceramics allows for the tuning of piezoelectric responses. By optimizing the composition, the ceramics show enhanced d33 and TC, making them potential candidates for lead-free piezoceramics at high temperatures.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Multidisciplinary
Jian Fu, Zide Yu, Aiwen Xie, Ziyi Yu, Zhengqian Fu, Xuewen Jiang, Tianyu Li, Ruzhong Zuo
Summary: In this study, in-situ synchrotron x-ray diffraction and transmission electron microscopy were conducted to investigate the structural mechanism of BF-PT-0.19Ba(Zr,Ti)O3 high-temperature piezoceramic. It was found that an irreversible transition from tetragonal phase (T phase) to rhombohedral phase (R phase) occurred after poling, leading to significantly enhanced irreversible domain switching of both R and T phases. This study provides a new mechanism for designing high-performance high-temperature piezoelectric ceramics.
Article
Physics, Condensed Matter
Yan Wang
Summary: The structure of La doped BiFeO3 at low doping content is not completely the believed hexagonal R3c phase, but contains an orthorhombic crystal symmetry. Under certain pressure conditions, a phase transition sequence from hexagonal R3c phase to monoclinic C2/m phase and then to orthorhombic Pnma phase was observed in La-doped BiFeO3.
SOLID STATE COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
N. D. Long, P. T. Tho, N. D. Co, L. T. Ha, N. T. M. Hong, C. T. A. Xuan, C. V. Ha, V. N. Shut, V. I. Mitsiuk, M. V. Bushinsky, M. V. Silibin, D. V. Karpinsky
Summary: Bi1-xEuxFeO3 ceramic samples with x = 0.1-0.2 were synthesized to investigate the correlation between multiphase coexistence and magnetic response. X-ray diffraction and Raman scattering spectra revealed structural transitions and a mixed phase state in the composition range of 0.10 <= x <= 0.18. Magnetic measurements showed weak ferromagnetic behavior, with maximum magnetization in phase mixture compounds and a decrease in single phase compounds. The different magnetic responses were explained in terms of phase boundary spins and intrinsic antiferromagnetic spins.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
L. V. Udod, S. S. Aplesnin, M. N. Sitnikov, E. V. Eremin, M. S. Molokeev, A. V. Shabanov, O. B. Romanova, A. M. Kharkov
Summary: A Bi2Fe4O9/BiFeO3 composite with a ratio of 67/33 has been synthesized and characterized. The average crystallite sizes for each phase were determined, and the magnetization hysteresis and disappearance temperature were established. The magnetic phase transitions of each phase were determined using infrared absorption spectra, and the correlation between the composite's structure and magnetic properties was studied.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Jing Chen, Lu Liu, Xiao Li Zhu, Z. V. Gareeva, A. K. Zvezdin, Xiang Ming Chen
Summary: The study investigated the effects of La/Lu co-substitution on BiFeO3 ceramics, and found that this method can introduce the Pna2(1) phase in the ceramics, further enhancing ferroelectric polarization and achieving the transition from antiferromagnetic to weak ferromagnetic state by destroying the cycloidal spin structure.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Xianfa Ai, Liugang Bian, Junchen Yang, Fangfang Wang, Kongjun Zhu, Kang Yan
Summary: By studying Ca-doped BFO-BT ceramics, multiple structural evolutions are found in the ferroelectric domains at the morphotropic phase boundary (MPB) in BFO-BT-based ceramics. Superior electrical properties including large electrostrain, intermediate piezoelectricity, and high Curie temperature are obtained at the MPB in these ceramics. The multiple local domain structural evolutions with compound ferroelectric domains and relaxor phases explain the inconsistent piezoelectric response under high and low electric fields at the MPB in the BFO-BT-based ferroelectric ceramics.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Sonia Rani, Ompal Singh, Shalu Kaushik, Pooja Sharma, Ashish Agarwal, Sujata Sanghi
Summary: The effect of Dy3+ ion substitution on the structural, dielectric, and magnetic behavior of BiFeO3 ceramics prepared via the solid-state route has been investigated. The substitution of Dy3+ ion with Bi3+ results in a phase transformation and a reduction in crystallite size. High-temperature transient interaction between oxygen vacancies and Fe3+/Fe2+ ions was observed. The addition of Dy improves the magnetic and dielectric properties, making BiFeO3 a suitable choice for data storage media.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
J. Gajendiran, S. Gnanam, C. Parthasaradhi Reddy, G. Ramesh Kumar, V. C. Bharath Sabarish, S. Gokul Raj, K. Ramachandran, V. P. Senthil, V. Gopi
Summary: In this paper, BiFeO3, YMnO3, and BiFeO3-YMnO3 compounds were synthesized and their structural, morphological, and light absorption characteristics were compared for the first time.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Sourabh Sharma, Ashok Kumar, O. P. Thakur
Summary: This research provides insights into the effects of Gd substitution on the structural, magnetic, and dielectric properties of Bismuth ferrite. The study reveals that Gd substitution leads to structural distortion, decrease in magnetic ordering parameters, and impact on dielectric properties. Microstructural analysis, electron paramagnetic resonance, and dielectric spectroscopy support the findings.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Jian Peng, Eleanor Parker, Helen E. A. Brand, Neeraj Sharma
Summary: The structural and thermal evolution of alkali-ion inserted ReO3 electrodes were studied using in situ and ex situ synchrotron X-ray diffraction. Sodium and potassium insertion involved intercalation into ReO3 and a two-phase reaction. Lithium insertion showed a more complex evolution with a conversion reaction at deep discharge. The thermal properties of A(x)ReO(3) phases (where A = Li, Na, or K) were significantly modified, indicating the impact of alkali-ion insertion on the thermal properties of ReO3.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Sheetal Sharma, Manoj Kumar
Summary: Sol-gel derived Sm-Co co-substituted BiFeO3 ceramics were investigated for their structural, vibrational, magnetic and optical properties. The results showed a distorted perovskite rhombohedral structure with R3c crystal symmetry, confirmed by X-ray diffraction (XRD) patterns and Raman spectra. The magnetic property measurements revealed enhanced ferromagnetic ordering parameters with increasing Sm-Co content. The optical property study indicated tuning of the energy band gap with Sm-Co co-substitution in BiFeO3 samples.
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Valeri Petkov, Adeel Zafar, Peter Kenesei, Sarvjit Shastri
Summary: Chemical compression effects on the ferroic orders in La substituted BiFeO3 were investigated using atomic pair distribution function analysis and structure modeling. The results showed that La substitution led to a reduction in lattice polarization, a strengthening of antiferromagnetic order, and a suppression of spin cycloid, resulting in nonzero magnetization. These changes in the ferroic orders were attributed to the chemical compression-induced alterations in octahedral rotation and ferroelectric displacement of Bi atoms, which acted as lattice degrees of freedom entangling the electronic and magnetic orders in BiFeO3.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Applied
Yosuke Isoda, Daisuke Kan, Takuya Majima, Yuichi Shimakawa
Summary: We investigated the electrochemical responses of (100), (110), and (111)-oriented oxygen-deficient perovskite SrFeO2.5+y epitaxial films. Only the (100)-oriented films exhibited changes associated with gate-voltage-induced electrochemical reductions. The electrochemically reduced (100) films were found to accommodate protons, forming the proton-containing oxide H0.11SrFeO2.5+y. Our results suggest that oxygen vacancies preferentially form along the {100} axes and ion diffusion in electrochemical reactions predominantly occurs along the {100} directions in SrFeO2.5+y.
APPLIED PHYSICS EXPRESS
(2023)
Article
Chemistry, Physical
Yanjia Zhang, Miho Sawamura, Maho Harada, Yusuke Noda, Masanobu Nakayama, Masato Goto, Daisuke Kan, Yuichi Shimakawa, Benoit Denis Louis Campeon, Daisuke Shibata, Toshiaki Ohta, Naoaki Yabuuchi
Summary: This study investigates the Li3NbO4-CoO binary system and finds that although Li4/3Co2/9Nb4/9O2 exhibits a reversible capacity increase as electrode material, there are irreversible structural changes in its electrochemical cycles, leading to the instability of anionic redox.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Taro Kamada, Taisei Ueda, Shuta Fukuura, Takashi Yumura, Saburo Hosokawa, Tsunehiro Tanaka, Daisuke Kan, Yuichi Shimakawa
Summary: In this study, catalytic model systems based on Pd-loaded SrFeOx films were fabricated to investigate the phenomenon of hydrogen spillover. The results showed that hydrogen spillover on the SrFeOx support can extend over long distances, up to 600 μm. The reduction of Fe4+ on the support surface induced by hydrogen spillover yields large energies, driving the unexpectedly long-distance hydrogen diffusion. These findings provide a deeper understanding of hydrogen spillover and offer insights for designing catalyst systems with enhanced properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Antara Sarkar, Anirban Das, Soumen Ash, Kandalam V. Ramanujachary, Samuel E. Lofland, Nibedita Das, Kaustava Bhattacharyya, Ashok Kumar Ganguli
Summary: We synthesized Sr2YbRu1-x Ta x O6 and studied its structural, magnetic, and photoelectrocatalytic properties. The substitution of Ta for Ru affected the magnetic properties, band gap, and valence band energy level. The series showed antiferromagnetic interaction and the Weiss temperature decreased with the increase of Ta concentration. The band gap increased linearly with the increase of Ta concentration, and the energy level of the valence band decreased. The series also exhibited good photoelectrocatalytic activity for the oxygen evolution reaction.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hideki Narita, Jun Ishizuka, Daisuke Kan, Yuichi Shimakawa, Youichi Yanase, Teruo Ono
Summary: The superconducting diode effect (SDE) has great potential for developing ultralow power consumption circuits and non-volatile memory. However, controlling the SDE requires precise tuning of current, temperature, magnetic field, or magnetism. This study demonstrates a zero-field SDE with an efficiency of up to 40% in Fe/Pt-inserted non-centrosymmetric Nb/V/Ta superconducting artificial superlattices. The polarity and magnitude of the zero-field SDE are controllable by magnetization direction, indicating the influence of the effective exchange field on Cooper pairs.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Robert V. Chimenti, James T. Carriere, Danielle M. D'Ascoli, Jamison D. Engelhardt, Alyssa M. Sepcic, Kayla A. Bensley, Alexandra M. Lehman-Chong, Joseph F. Stanzione III, Samuel E. Lofland
Summary: Glass transition temperature is a crucial characteristic for describing the behavior of polymeric materials. The conformational entropy increase during glass transition affects the phonon density of states. Low-frequency Raman features, including the Boson peak and van Hove peak, and quasi-elastic Rayleigh scattering, contribute to the broad disorder band below 100 cm (-1) in amorphous materials. The temperature dependence of the ratio of integrated intensity near the Boson peak to that of the van Hove peak shows a kink at the glass transition temperature, indicating a change in the phonon density of states.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Thomas Mion, Benjamin M. Lefler, Margo Staruch, Steven Bennett, Norman Gottron, Samuel E. Lofland, Konrad Bussmann, Nicholas Gangemi, Jeffrey Baldwin, Peter Finkel
Summary: The angular dependence of the magnetic field response of fully suspended resonant microelectromechanical double-clamped magnetoelectric beams was investigated as the basis for a vector magnetometer. The magnetoelectric heterostructure, consisting of strain-coupled magnetostrictive iron cobalt (FeCo) and piezoelectric aluminum nitride layers, demonstrated a high magnetic field sensitivity and transfer function. The anisotropic behavior of the fundamental frequency shift to an external magnetic field was observed, making this design suitable for an on-chip high sensitivity vector magnetometer when multiplexed with multiple resonators.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Huma Khan, Samuel E. Lofland, Kandalam V. Ramanujachary, Norah Alhokbany, Tokeer Ahmad
Summary: In this study, multiferroic GdCrO3 nanoassemblies were synthesized using a solvothermal method for efficient and long-lasting oxide catalysts in energy storage and conversion. XRD and XPS studies confirmed the orthorhombic structure formation of GdCrO3. Scanning and high-resolution transmission electron microscopy showed the formation of nanoassemblies. Ferroelectric study revealed the remnant polarization of 2.36 mu C cm(-2). In alkaline media, GdCrO3 nanoassemblies acted as an efficacious and resilient oxygen evolution reaction electrocatalyst by showing superior specific activity. Photocatalytic H2 evolution studies demonstrated a high H-2 evolution rate of 2 mmol h(-1) gcat(-1) and an apparent quantum yield of 23.2%. XPS measurements confirmed the mechanism of significant H2 generation through internal electric field-associated charge transfer.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Automation & Control Systems
Naohiro Fujinuma, Samuel E. E. Lofland
Summary: Machine learning can be used to accelerate materials research, but data scarcity and model uncertainty often hinder its deployment in experimental research. This study demonstrates the effectiveness of a human-in-the-loop procedure to tailor machine learning for multicriteria optimization in the development of a nafion-based membrane electrode assembly for electrochemical CO2 reduction reaction. By analyzing nonlinear correlations, relevant features are identified for energy efficiency and partial current density for CO2RR. The selected model, based on careful inspection and analysis, shows the highest accuracy and can locate the Pareto front with a single round of experiments, highlighting the importance of appropriate model selection in accelerating the research cycle.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Physical
Yanjia Zhang, Miho Sawamura, Maho Harada, Yusuke Noda, Masanobu Nakayama, Masato Goto, Daisuke Kan, Yuichi Shimakawa, Benoit Denis Louis Campeon, Daisuke Shibata, Toshiaki Ohta, Naoaki Yabuuchi
Summary: In this study, Li3NbO4-CoO binary system was investigated as electrode materials for lithium storage applications. It was found that with the increase of Li3NbO4 fraction, cation-disordered rocksalt structure formed in Li-excess phases, leading to the degradation of performance. Factors affecting the reversibility and irreversibility of anionic redox were further discussed through systematic study of the binary system of Li3NbO4-CoO.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Ryunosuke Takahashi, Takuo Ohkochi, Daisuke Kan, Yuichi Shimakawa, Hiroki Wadati
Summary: Using a magneto-optical Kerr effect (MOKE) microscope, we observed laser-induced magnetization switching in ferrimagnetic oxide NiCo2O4 (NCO) epitaxial thin films with perpendicular magnetic anisotropy. Laser pulses at 1030 nm were used to irradiate the NCO thin film at different temperatures (300-400 K) while altering the parameters of pulse interval, fluence, and the number of pulses in the absence of an external magnetic field. We observed accumulative all-optical helicity-dependent switching above 380 K. Our observation of oxide NCO thin films facilitates magnetization switching using ultrafast lasers without the need for a magnetic field.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yufan Shen, Mitsutaka Haruta, I. -Ching Lin, Lingling Xie, Daisuke Kan, Yuichi Shimakawa
Summary: The binary fluorite oxide Hf0.5Zr0.5O2 has attracted significant attention due to its distinct and superior ferroelectricity. However, stabilizing its metastable phase and understanding the growth mechanism remain challenging. Recent investigations have shown the growth of metastable ferroelectric Hf0.5Zr0.5O2 on structurally dissimilar perovskite oxides, which are nonpolar in their bulk form. Yet, the growth mechanism of these unique fluorite-perovskite heterostructures is still not fully explored.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Electrochemistry
Lingling Xie, Yosuke Isoda, Takuya Majima, Yufan Shen, Daisuke Kan, Yuichi Shimakawa
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Analytical
Robert V. Chimenti, Alexandra M. Lehman-Chong, Alyssa M. Sepcic, Jamison D. Engelhardt, James T. Carriere, Kayla A. Bensley, Adam Markashevsky, Jianwei Tu, Joseph F. Stanzione III, Samuel E. Lofland
Summary: Characterizing the extent of cure kinetics in polymers is crucial for understanding their structure-property-processing relationships. This study demonstrates a novel and non-destructive method of measuring polymerization kinetics using low-frequency Raman spectroscopy. By analyzing the disorder band and its shoulder in the spectrum, both structural and chemical conversion kinetics can be obtained. The results show a relationship between the chemical and structural kinetics, which may be related to the material's softness.
Review
Chemistry, Inorganic & Nuclear
Naohiro Fujinuma, Samuel E. Lofland
Summary: The effects of climate change and finite fossil fuel supply have led to the research on the electrocatalytic reduction of CO2. The demand for multi-carbon feedstock offers financial incentives, accelerating the search for solutions to the climate problem, but the technology is still in the process of being commercialised, with the use of ambient CO2 as a prerequisite.
INORGANIC CHEMISTRY FRONTIERS
(2023)
