Article
Chemistry, Physical
S. A. Gridnev, I. I. Popov, M. A. Kashirin, A. Bocharov
Summary: By investigating the temperature dependences of internal friction and Young's modulus in ferroelectric ceramics, the effects of different external conditions on the material's performance were observed. The addition of 0.2 mass. % La led to an increase in internal friction and a decrease in the internal friction maximum near the phase transition temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Qianwei Huang, Zibin Chen, Matthew J. Cabral, Haosu Luo, Hongwei Liu, Shujun Zhang, Yulan Li, Yiu-Wing Mai, Simon P. Ringer, Xiaozhou Liao
Summary: The study investigates the impact of introducing dislocation loops via electron beam on the motion of ferroelectric domain walls in ferroelectric nanoplates. It was found that defects caused by localized strain fields suppress the motion of domain walls, and the pinning effect can be enhanced by multiple domain walls embedded with defect arrays. This suggests the potential for manipulating domain switching in ferroelectric nanoplates using electron beams.
Article
Nanoscience & Nanotechnology
Artemios Karvounis, Rachel Grange
Summary: In this study, deformable assemblies of barium titanate nanocrystals were fabricated using electro-mechanical force on top of plasmonic metasurfaces. The mechanical deformation of the nanobeams was driven by the piezoelectric response of the barium titanate nanocrystals. The plasmonic-ferroelectric nanostructures enabled subwavelength interaction lengths and supported reflection modulation.
Article
Nanoscience & Nanotechnology
Yezhan Lin, Yizheng Bao, Shiguang Yan, Bowen Chen, Kai Zou, Hengchang Nie, Genshui Wang
Summary: The thermal conductivity k of BaTiO3 ceramic can be modulated by adjusting the ferroelectric polarization P, providing a new research route for thermal management technology.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
A. Skrylev, G. M. Akbaeva, A. Burkhanov, R. Dikov, E. Barabanova
Summary: The dielectric response of calcium-doped ceramics Ba0.95Ca0.05TiO3 was investigated, revealing that prolonged sample exposure at a constant temperature enhances anomalies in the behavior of the permittivity reverse dependences due to the contribution of material's defective structure.
Article
Metallurgy & Metallurgical Engineering
Jesse Nii Okai Amu-Darko, Chen Zhang, Shahid Hussain, Samuel Leumas Otoo, Michael Freduah Agyemang
Summary: The environmentally-friendly relaxor ferroelectric ceramics were prepared and sintered, with Ba(Mg1/3Ta2/3)O-3 content affecting grain size and dielectric properties. Increasing BMT content led to improved dielectric performance and transition from ferroelectric to paraelectric phase.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Physics, Condensed Matter
Injamul Alam, Subhasri Subudhi, Sonali Das, Manoranjan Mandal, Santosini Patra, Rashmirekha Sahu, Smaranika Dash, Pawan Kumar, Pitamber Mahanandia
Summary: We have developed a graphene-based highest-k ferroelectric field-effect transistor (GFE-FET) with few-layer graphene sheets (FLGS) as the channel layer and high-k ferroelectric material such as barium zirconium titanate/barium calcium titanate (BZT/BCT) as the insulating gate layer. Various characterization techniques were used to confirm the quality of FLGS and BZT/BCT materials. The fabricated GFE-FET exhibited a field-effect mobility of approximately -1.72 x 104 cm2V-1s- 1 and an on/off ratio of 103, suggesting its potential applications in high-speed electronic devices.
SOLID STATE COMMUNICATIONS
(2023)
Article
Mechanics
Dan Sui, John E. Huber, Jie Zhou
Summary: The study utilizes superposition theory to analyze the boundary value problem of needle domains in barium titanate single crystals, revealing conditions for stabilizing needle domains and presenting simulation results of comb-like array evolution.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Physics, Applied
Bhupendra Pratap Singh, Samiksha Sikarwar, Rajiv Manohar, Asmita Shah, Dharmendra Pratap Singh, Jakub Herman, Kamal Kumar Pandey
Summary: The study investigates the properties of BaTiO3 NPs in a nematic matrix, finding that they enhance dielectric permittivity and improve electro-optic response speed. The introduction of BaTiO3 NPs in the nematic matrix increases dielectric anisotropy and significantly boosts electro-optic response speed.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Jing Shi, Rizhuang Dong, Jiayi He, Daowei Wu, Wenchao Tian, Xiao Liu
Summary: This study investigated the structural, dielectric, and ferroelectric properties of lead-free ceramics based on the ternary system of BaTiO3 (BT). It was observed that the dopant concentration influenced the structural evolution from tetragonal to pseudocubic phase. The dielectric response showed diffusive peaks and relaxor behavior, indicating a transition from ferroelectric to relaxor state. The ceramics exhibited slim polarization hysteresis loops and electrical inhomogeneities caused by excessive dopant addition, leading to degraded electric breakdown strength. The oxygen vacancy hopping mechanism was proposed to explain the diffuse dielectric response at high dopant concentrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Ke Meng, Wenhua Li, Yansong Zhang, Siyuan Zhang, Xingui Tang, Xiaobin Guo, Yanping Jiang
Summary: Ba0.955La0.03TiO3-doped Zr ferroelectric ceramics were prepared by solid-state reaction method, and the experimental results confirmed the adjustable thermal stability of these ceramics. Various characterization methods demonstrated the good crystallization and electrical properties of the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
Olga Mazur, Ken-ichi Tozaki, Yukio Yoshimura, Leonid Stefanovich
Summary: In this study, the ferroelectric phase transition in barium titanate was investigated under pressure using differential scanning calorimetry and the Landau-Ginzburg theory. The experimental results demonstrated the presence of intermediate short-lived phases during the transition process, indicating a nonmonotonic relaxation process. It was also observed that under certain conditions, the sample could undergo monodomenization despite the preference for polydomain ordering. Furthermore, increasing pressure led to a narrowing of the temperature hysteresis, and a new tricritical point characterizing the phase transition change was identified experimentally and theoretically confirmed.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Mechanics
Andrey Tumarkin, Natalya Tyurnina, Nikolay Mukhin, Zoya Tyurnina, Olga Sinelshchikova, Alexander Gagarin, Eugeny Sapego, Yriy Kretser
Summary: Glass-ceramic composites consisting of potassium-iron-silicate glass and barium titanate in various proportions were successfully synthesized by low-temperature sintering. The electrical properties of the composites, such as permittivity and tunability, can be improved by annealing the samples in an oxygen-containing environment.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Sergio Puebla, Thomas Pucher, Victor Rouco, Gabriel Sanchez-Santolino, Yong Xie, Victor Zamora, Fabian A. Cuellar, Federico J. Mompean, Carlos Leon, Joshua O. Island, Mar Garcia-Hernandez, Jacobo Santamaria, Carmen Munuera, Andres Castellanos-Gomez
Summary: We demonstrate the fabrication of field-effect transistors based on single-layer MoS2 and a thin layer of BaTiO3 (BTO) dielectric. The thin BTO provides a high-kappa gate dielectric effectively screening Coulomb scattering centers. These devices show higher mobilities compared to standard SiO2 dielectrics and are comparable to devices using hexagonal boron nitride. The ferroelectric character of BTO induces a robust hysteresis in the current vs gate voltage characteristics, making it attractive for memory storage applications. Our results open up possibilities for integrating complex oxides with strongly correlated physics in 2D-based devices.
Article
Engineering, Environmental
Yang Li, Yi Liu, Mingyang Tang, Jingwen Lv, Fukang Chen, Quan Li, Yan Yan, Fei Wu, Li Jin, Gang Liu
Summary: A two-step strategy has been proposed in this study to enhance the energy storing performance of lead-free ferroelectric ceramics, which includes adjusting the ratio of chemical elements and optimizing the preparation process, and has been proven to significantly improve the energy storage performance, especially achieving superhigh energy storage density for a new ceramic material under high electric field.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Denny Lang, Leila Balaghi, Stephan Winnerl, Harald Schneider, Rene Huebner, Susanne C. Kehr, Lukas M. Eng, Manfred Helm, Emmanouil Dimakis, Alexej Pashkin
Article
Physics, Applied
Lukas Wehmeier, Tobias Noerenberg, Thales V. A. G. de Oliveira, J. Michael Klopf, Seung-Yeul Yang, Lane W. Martin, Ramamoorthy Ramesh, Lukas M. Eng, Susanne C. Kehr
APPLIED PHYSICS LETTERS
(2020)
Article
Optics
Amin Soltani, Frederik Kuschewski, Marlene Bonmann, Andrey Generalov, Andrei Vorobiev, Florian Ludwig, Matthias M. Wiecha, Dovile Cibiraite, Frederik Walla, Stephan Winnerl, Susanne C. Kehr, Lukas M. Eng, Jan Stake, Hartmut G. Roskos
LIGHT-SCIENCE & APPLICATIONS
(2020)
Article
Optics
Named Aminpour, Lukas M. Eng, Susanne C. Kehr
Article
Chemistry, Multidisciplinary
Thales V. A. G. de Oliveira, Tobias Noerenberg, Gonzalo Alvarez-Perez, Lukas Wehmeier, Javier Taboada-Gutierrez, Maximilian Obst, Franz Hempel, Eduardo J. H. Lee, J. Michael Klopf, Ion Errea, Alexey Y. Nikitin, Susanne C. Kehr, Pablo Alonso-Gonzalez, Lukas M. Eng
Summary: Research demonstrates nanoscale-confined phonon polaritons at THz frequencies in vdW semiconductors using scattering-type scanning near-field optical microscopy and a free-electron laser, achieving extreme field confinement and low optical losses.
ADVANCED MATERIALS
(2021)
Article
Optics
Tobias Noerenberg, Lukas Wehmeier, Denny Lang, Susanne C. Kehr, Lukas M. Eng
Summary: Nanotechnology and modern materials science require reliable local probing techniques at the nanoscale. Different scanning probe microscopy methods, including scattering scanning near-field optical microscopy (s-SNOM) and Kelvin-probe force microscopy (KPFM), can be combined to compensate for undesirable electrostatic interactions and enable in situ probing of local electric potentials on sample surfaces.
Article
Multidisciplinary Sciences
Flavio H. Feres, Rafael A. Mayer, Lukas Wehmeier, Francisco C. B. Maia, E. R. Viana, Angelo Malachias, Hans A. Bechtel, J. Michael Klopf, Lukas M. Eng, Susanne C. Kehr, J. C. Gonzalez, Raul O. Freitas, Ingrid D. Barcelos
Summary: This study introduces tin oxide nanobelts as a platform for transporting phonon polaritons in the far-infrared range, showcasing their unique photonic properties and potential applications.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Ziheng Yao, Xinzhong Chen, Lukas Wehmeier, Suheng Xu, Yinming Shao, Zimeng Zeng, Fanwei Liu, Alexander S. Mcleod, Stephanie N. Gilbert Corder, Makoto Tsuneto, Wu Shi, Zihang Wang, Wenjun Zheng, Hans A. Bechtel, G. L. Carr, Michael C. Martin, Alex Zettl, D. N. Basov, Xi Chen, Lukas M. Eng, Susanne C. Kehr, Mengkun Liu
Summary: s-SNOM is a powerful tool commonly used for infrared nano-spectroscopy, but it lacks sensitivity to in-plane sample anisotropy. Authors introduce a method involving a metallic microdisk antenna to improve sensitivity by probing in-plane phonon responses.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Julian Barnett, Lukas Wehmeier, Andreas Hessler, Martin Lewin, Julian Pries, Matthias Wuttig, J. Michael Klopf, Susanne C. Kehr, Lukas M. Eng, Thomas Taubner
Summary: Chalcogenide phase change materials can reversibly switch between non-volatile states with vastly different optical properties, enabling novel active nanophotonic devices. In this study, infrared scattering-type scanning near-field optical microscopy (SNOM) and Kelvin probe force microscopy (KPFM) were used to investigate four states of laser-switched Ge3Sb2Te6 with nanometer lateral resolution. The research found that SNOM is sensitive to differences between crystalline and amorphous states, while KPFM has higher sensitivity to changes introduced by melt-quenching.
Article
Optics
M. Chen, T. V. A. G. de Oliveira, I. Ilyakov, T. Noerenberg, F. Kuschewski, J-C Deinert, N. Awari, A. Ponomaryov, M. Kuntzsch, S. C. Kehr, L. M. Eng, M. Gensch, S. Kovalev
Summary: This article presents a conceptually new approach to synchronizing accelerator-based light sources and external laser systems. The method utilizes an intense accelerator-based single-cycle terahertz pulse to slice a femtosecond-level part of a longer picosecond laser pulse, achieving precise synchronization of approximately 10 fs for real-time lock-in amplifier signal demodulation. The concept was successfully demonstrated in three benchmark experiments using a 4th generation accelerator-based terahertz light source.
Article
Chemistry, Multidisciplinary
Tobias Norenberg, Gonzalo Alvarez-Perez, Maximilian Obst, Lukas Wehmeier, Franz Hempel, J. Michael Klopf, Alexey Y. Nikitin, Susanne C. Kehr, Lukas M. Eng, Pablo Alonso-Gonzalez, Thales V. A. G. de Oliveira
Summary: This study provides a thorough characterization of different hyperbolic and elliptical PhP modes in alpha-germanium(II) sulfide (GeS) using THz nanospectroscopy and theoretical analysis.
Article
Chemistry, Multidisciplinary
Flavio H. Feres, Ingrid D. Barcelos, Alisson R. Cadore, Lukas Wehmeier, Tobias Noerenberg, Rafael A. Mayer, Raul O. Freitas, Lukas M. Eng, Susanne C. Kehr, Francisco C. B. Maia
Summary: In this study, we used a highly brilliant and tunable free-electron laser to illuminate a nanoscope and observe the graphene nano-optical response from 1.5 to 6.0 THz. At frequencies below 2 THz, graphene exhibited a metal-like behavior and screened optical fields similar to noble metals. At 3.8 THz, plasmonic resonances caused a field-enhancement effect that improved the imaging power of graphene. Furthermore, we demonstrated tunability of the metallic behavior and the field-enhancement effect through electrical doping, providing additional control over graphene's nano-optical properties in the THz gap.
Article
Multidisciplinary Sciences
Joseph Matson, Soeren Wasserroth, Xiang Ni, Maximilian Obst, Katja Diaz-Granados, Giulia Carini, Enrico Maria Renzi, Emanuele Galiffi, Thomas G. Folland, Lukas M. Eng, J. Michael Klopf, Stefan Mastel, Sean Armster, Vincent Gambin, Martin Wolf, Susanne C. Kehr, Andrea Alu, Alexander Paarmann, Joshua D. Caldwell
Summary: The properties of phonon polaritons (PhPs) in the monoclinic crystal ss-Ga2O3 (bGO) were investigated, and strongly asymmetric propagation and frequency dispersive optical axis were observed. The symmetry-broken propagation of hyperbolic shear polaritons in bGO was directly imaged using scanning near-field optical microscopy (sSNOM). The control and enhancement of shear-induced propagation asymmetry were demonstrated by varying the incident laser orientation and polariton momentum using different sizes of nano-antennas, and significant rotation of the hyperbola axis was observed by changing the frequency of incident light. These findings lay the groundwork for the widespread utilization and implementation of polaritons in low-symmetry crystals.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Felix G. Kaps, Susanne C. Kehr, Lukas M. Eng
Summary: This paper theoretically and experimentally explores the influence of linear polarization control on near-field coupling, demonstrating that resonantly excited samples respond with a strong near-field signal to different linear polarization angles. By varying the illumination polarization angle, the scattered near-field signatures at different wavelengths can be quantitatively compared.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Lukas Wehmeier, Denny Lang, Yongmin Liu, Xiang Zhang, Stephan Winnerl, Lukas M. Eng, Susanne C. Kehr