Article
Chemistry, Multidisciplinary
Amelie Beduer, Fabien Bonini, Connor A. Verheyen, Martina Genta, Mariana Martins, Joe Brefie-Guth, Josefine Tratwal, Aleksandra Filippova, Patrick Burch, Olaia Naveiras, Thomas Braschler
Summary: A novel type of injectable biomaterial with elastic softening transition properties has been developed, allowing in vivo shaping and induction of stable 3D vascularized tissue. Through extensive numerical simulation, this injectable meta-biomaterial can reversibly change stiffness during deformation, potentially providing new perspectives in soft tissue engineering and regenerative medicine.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Estefania Vidal-Henriquez, David Zwicker
Summary: The study presents a theoretical description of droplets growing in an elastic matrix, revealing that large droplets only form when cavitation occurs, stabilizing the size and position of smaller droplets and increasing in density with faster cooling. The model also indicates how adjusting cooling protocols and nucleation site density affects droplet size distribution.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Multidisciplinary
Arman Shojaei, Alexander Hermann, Pablo Seleson, Stewart A. Silling, Timon Rabczuk, Christian J. Cyron
Summary: The paper focuses on applying peridynamics (PD) to the propagation of elastic waves in unbounded domains. It introduces absorbing boundary conditions (ABCs) that are derived from a semi-analytical solution of the PD governing equation. The proposed ABCs have Dirichlet-type implementation, are constructed in the time and space domains, and offer advantages in terms of simplicity and compatibility with the near-field solution.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Kai Hu, Jun Yi, Bo Huang, Xilei Bian, Gang Wang
Summary: This study overcomes the trade-off between strength and ductility in pure nickel materials by using grain boundary relaxation and optimizing grain size. The results show that grain boundary relaxation can improve both tensile strength and uniform elongation of nickel, and enhance the plastic deformation through controlling dislocation activities.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Multidisciplinary
C. Bran, J. A. Fernandez-Roldan, J. A. Moreno, A. Fraile Rodriguez, R. P. del Real, A. Asenjo, E. Saugar, J. Marques-Marchan, H. Mohammed, M. Foerster, L. Aballe, J. Kosel, M. Vazquez, O. Chubykalo-Fesenko
Summary: This study investigates the dynamics of domain walls in cylindrical magnetic Ni nanowires with geometrical notches. Experimental results show that larger current densities induce domain wall nucleation, while smaller currents preferentially move domain walls in the antiparallel direction to the current. Thermal modeling suggests that larger current densities temporarily raise the temperature in the nanowire above the Curie temperature, resulting in the nucleation of domain walls during system cooling. Micromagnetic modeling reveals that for intermediate current densities, Bloch point domain walls with chirality parallel to the Oersted field propagate antiparallel to the current direction.
Article
Chemistry, Physical
Sandra Ruiz-Gomez, Anna Mandziak, Laura Martin-Garcia, Jose Emilio Prieto, Pilar Prieto, Carmen Munuera, Michael Foerster, Adrian Quesada, Lucia Aballe, Juan de la Figuera
Summary: This study conducted a detailed analysis of the structural, magnetic, and chemical properties of non-stoichiometric cobalt ferrite micrometric crystals. With the use of advanced techniques such as x-ray magnetic circular dichroism, photoemission microscopy, low-energy electron microscopy, and atomic force microscopy, the magnetization vector inside the crystals was resolved at the nanoscale, and the location of magnetic domain walls was correlated with different types of defects. The findings are crucial for understanding the magnetic properties of thin films and nanostructures.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Xinrong Wang, Kai Guan, Jie Liu, Xige Liu
Summary: Pillar burst events are influenced by not only the pillar itself, but also other components of the roof-pillar system. Factors affecting the occurrence of burst events include the application of instability theory, the pillar strength and stiffness ratio, properties of the unmined orebody, and the thickness and span of the rock beam.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Chen-Bo-Wen Li, Hao-Cheng Thong, Yi-Xuan Liu, Ke Bi, Zhengqian Fu, Ke Wang
Summary: This study systematically investigates the hardening effect in ferroelectric materials and reveals its association with the nanoscale domain reconfiguration and the ferroelectric-paraelectric phase transition temperature. It offers new insights into improving the performance of high-power piezoelectric applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Energy & Fuels
Kausthubharam, Poornesh Kumar Koorata, Neelkandan Chandrasekaran
Summary: This article investigates the lithiation of low-expansion electrode particles with concentration-dependent properties. The study reveals significant changes when considering concentration dependency, with stresses at the center of the particle increasing with stiffening and decreasing with softening. The effect of concentration-dependent elastic modulus on the concentration gradient of lithium ions at the surface of the particle is more prominent at higher charging rates.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Yongtao Liu, Roger Proksch, Chun Yin Wong, Maxim Ziatdinov, Sergei Kalinin
Summary: This study explored domain dynamics in model polycrystalline materials using deep learning and rVAE methods. The research found that these methods can be used to unambiguously identify and classify ferroelectric and ferroelastic domain walls, providing insights into the intrinsic mechanisms of polarization switching.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Ceramics
Naveen Aruchamy, Tony Schenk, Veronika Kovacova, Sebastjan Glinsek, Emmanuel Defay, Torsten Granzow
Summary: Novel applications of ferroelectric films require different substrates that exert varying mechanical stress on the film, leading to questions about the reliability of differently stressed films. This study compares the fatigue behavior of PZT films under different stress states, revealing that tensile stress causes gradual degradation while compressive stress leads to abrupt degradation. The main fatigue mechanism is domain wall pinning on charged defects.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Huiying Liu, LingXu Wang, Zhibiao Ma, Xiaodong Guo, Bingdong Yao, Yangyang Wang, Yan Liu, Fengqing Zhang, Luyi Zhu
Summary: Epitaxial growth of BiFe0.95Mn0.05O3 (BFMO) thin films on single crystal substrates with different orientations was achieved by sol-gel and layer-by-layer rapid thermal annealing methods. The structure and aging behavior of the films were analyzed using various test techniques.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Taimin Cheng, Guoliang Yu, Xinxin Zhang
Summary: Based on first-principles calculations, the effects of pressure on various properties of TMFe3N (TM = Ni, Pd, Pt) compound are studied and compared with the parent phase Fe4N. The results show that the substitution of atoms has a positive effect on the magnetic and mechanical characteristics of the parent phase, while also leading to pressure-induced elastic softening and negative thermal expansion.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Physical
Meihong Liu, Shuai Du, Fanghzou Wang, Roman Adam, Qiuyue Li, Xiaoqi Ma, Xinfang Guo, Xiaowen Chen, Jing Yu, Yawen Song, Jie Xu, Shandong Li, Derang Cao
Summary: The influence of surface pinning on domain structure and magnetization dynamics in permalloy stripe domain films was studied by controlling the effect of pinning via introducing defects. The irregular stripe domain pattern caused by these defects may lead to a weakening of magnetization resonant frequency and intensity. The importance of regularity and homogeneity of the stripe domain structure for the excitation of spin waves was further confirmed by micromagnetic simulation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Multidisciplinary
Xiaochuan Ma, Qingsong Feng, Linya Liu, Jinhui Xu, Pengfei Zhang, Huapeng Chen
Summary: This paper introduces a non-local method to construct absorbing boundary conditions in the bond-based peridynamic theory for simulating elastic wave propagation in unbounded solids. The study provides an expression for inter-particle damping force density satisfying balance laws and offers a process and algorithm for implementing non-local absorbing boundary conditions. Numerical simulations demonstrate the effectiveness of these absorbing boundary conditions in stably absorbing and attenuating incident elastic waves.
APPLIED MATHEMATICAL MODELLING
(2022)
Review
Physics, Condensed Matter
Yan Chen, Boyuan Gou, Bincheng Yuan, Xiangdong Ding, Jun Sun, Ekhard K. H. Salje
Summary: This article introduces various physical processes that can cause avalanches in materials, as well as methods to distinguish between these processes and a new approach to measure the relationship between avalanche energy and amplitude. It is noted that the energy and amplitude of avalanches are not universal constants, but depend on the avalanche mechanism, with examples of multi-branching effects shown in different materials.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xiaomei He, Suzhi Li, Xiangdong Ding, Jun Sun, Sergey Kustov, Ekhard K. H. Salje
Summary: This study presents the first attempt to investigate the internal friction of complex ferroelastic twin patterns using atomistic molecular dynamics simulations. Linear and non-linear internal friction regimes are observed at different stress amplitudes, separated by a pinning/depinning threshold. The motion of twin boundaries generates non-linear anelasticity, where the stress-dependent internal friction increases to a maximum and then decays. The internal friction is directly related to the motion of needle twins.
Article
Physics, Applied
Yangyang Xu, Guomang Shao, Yumei Zhou, Yu Wang, Sen Yang, Xiangdong Ding, Jun Sun, E. K. H. Salje, Turab Lookman, Dezhen Xue
Summary: A ferroelectric phase transition in barium titanate single crystals under an external electric field is observed, showing scale invariant nucleation and growth of complex domain structures. The energy exponent varies with the external bias and cooling history, with the exponent being near 1.68±0.022 for a single-domain sample after field cooling and 1.66 for a multi-domain sample after zero field cooling under high fields. The complex domain patterns in the multi-domain sample hinder the movement of the phase boundary and generate more small energy signals, resulting in a high critical exponent. The aftershock time distribution remains the same for all switching conditions with Omori exponent near -1 and switching time correlations of -1±0.05 for short times and -2±0.10 for long times.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Guomang Shao, Yangyang Xu, Yumei Zhou, Xiangdong Ding, Jun Sun, E. K. H. Salje, Turab Lookman, Dezhen Xue
Summary: The avalanche dynamics of ferroelectric switching in lead zirconate titanate ceramics were investigated. Two distinct power-law regimes were identified, and the critical energy exponents were determined. The events were attributed to the depinning of domain walls from different types of defects.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
E. K. H. Salje, S. Kustov
Summary: Domain walls and ferroelastic twin boundaries play important roles in the diffusion of chemical dopants and lattice defects. They can serve as templates for chemical structures and carry dopants when moved. However, the activation of this mechanism depends on the external force applied. This article discusses various experimental methods and approaches in this field.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Sergey Kustov, Juan Miguez Obrero, Xiebin Wang, Dragan Damjanovic, Ekhard K. H. Salje
Summary: This study analyzed the structural transformations of unpoled PMN-PT single crystals with different compositions using calorimetry and acoustic spectroscopy. It was found that there are extended two-phase regions during cooling and heating, and the observed structural transitions are first order despite their proximity to the morphotropic boundary.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yangyang Xu, Guomang Shao, Jianbo Pang, Yumei Zhou, Xiangdong Ding, Jun Sun, Turab Lookman, E. K. H. Salje, Dezhen Xue
Summary: Ferroic switching of 90 degrees domains in BaTiO3 can be both ferroelectric and ferroelastic. Although the hysteresis characteristics of their respective ferroelectric and ferroelastic are similar, their dynamic properties are different. The switching process involves avalanches, where changes in the domain structure trigger further nanostructural changes until the avalanches stop and the sample remains in a metastable state. The energy exponent during ferroelectric switching is close to the mean field value, while stress-driven ferroelastic switching is characterized by a much larger value. BaTiO3 displays three separate dynamical processes for microstructural changes under electric and mechanical stress fields.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Jack T. Eckstein, Michael A. Carpenter, Ekhard K. H. Salje
Summary: Systematic advances in acoustic emission (AE) spectroscopy have allowed for its applications in various fields, including medicine and minerals. This paper demonstrates the analysis of biological samples (kidney stones) and porous geological materials using AE, providing insights for further applications in medicine and geology.
Article
Physics, Applied
E. K. H. Salje
Summary: K.A. Muller mentored work outside IBM on Ferroic and Polaronic Materials already in the 1970s and showed a keen interest in any progress made in these fields afterwards. He supported particularly research of the fer-roelastic materials SrTiO3 and LaAlO3. He was also fascinated by research into polaronic states of WO3 and their effect on ferroic properties in perovskite samples. This demonstrates that his activities were not restricted to superconductivity but extended more generally in solid-state sciences including the field of phase transitions and pattern formations in nanomaterials.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Cam-Phu Thi Nguyen, Peggy Schoenherr, Ekhard K. H. Salje, Jan Seidel
Summary: The authors propose a method called crackling noise microscopy, which is based on AFM nanoindentation, to measure the crackling of individual nanoscale features. They use this method to study crackling noise and avalanches in ferroelectric materials. The crackling noise is a scale-invariant phenomenon found in various nonlinear dynamical material systems, and avalanches follow universal scaling rules described by power laws. The concept of crackling noise is widely used in different fields such as earthquake research and neural networks.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Xiaomei He, Xiangdong Ding, Jun Sun, Guillaume F. F. Nataf, Ekhard K. H. Salje
Summary: In this study, molecular dynamics simulations were performed to identify the ridges and valleys with rounded singularities around the intersections between twin walls and surfaces. The two dominant length scales observed were due to the elastic bending of the surface layer and local atomic reshuffles. For static twin walls, the change in Young's modulus involved softening near valleys and hardening near ridges. The boundary-induced changes in the surface Young's modulus were approximately 0.7%.
Article
Physics, Multidisciplinary
Francesco Cordero, Francesco Trequattrini, Paulo Sergio da Silva Jr, Michel Venet, Oktay Aktas, Ekhard K. H. Salje
Summary: Elastic softening in Ba1-xSrxTiO3 paraelectric phases is most pronounced near the transition temperatures and gradually decreases during heating, extending to the highest measured temperature for Ba-rich compounds. The excess compliance of the precursor softening follows a power law relationship with temperature, with different characteristic exponents ranging from 1.5 in SrTiO3 to 0.2 in BaTiO3. The softening is described by extremely low Vogel-Fulcher energies, indicating a change from a displacive to a weakly order-disorder character of the elastic precursor. The high-temperature elastic properties of these materials are significantly affected by precursor softening, as the elastic softening remains at about 33% of the unsoftened Young's modulus even at temperatures as high as 750 K in BaTiO3.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Wei Tan, Boyuan Gou, Xiangdong Ding, Jun Sun, Ekhard K. H. Salje
Summary: The characterization of filiform corrosion of Mg in NaCl solution was conducted using acoustic emission spectroscopy, measurements of the free-corrosion potential, and optical observations under in situ conditions. Three stages of corrosion were identified, along with the mechanisms involved.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Guangming Lu, Xiangdong Ding, Jun Sun, Ekhard K. H. Salje
Summary: Kinks and antikinks interact with each other elastically in ferroelastic domain walls and interfaces in ferroic materials. The interaction is purely dipolar with no indication of monopolar or higher order contributions, and kinks and antikinks attract each other while kink-kink interactions are repulsive. This interaction is believed to constitute, in part or in whole, the elusive wall-wall interaction in ferroelastics. The dipolar interactions decay as 1/d^2 over distances d between the kinks and between walls when the samples have nanoscale size. Nanoscale samples bend and tilt when kinks are introduced, and multiple kinks enhance the effect systematically, leading to bent and modulated twin walls.
Article
Materials Science, Multidisciplinary
Ekhard K. H. Salje
Summary: This article discusses the mechanical behavior and collapse phenomena of porous materials under stress, with emphasis on a collapse model proposed by Casals and Salje.
AIMS MATERIALS SCIENCE
(2022)
