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| http://dx.doi.org/10.1002/adma.200702605 | DOI Listing |
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Effect of Temperature on Magnetoimpedance Effect and Magnetic Properties of Fe- and Co-Rich Glass-Coated Microwires.
Materials (Basel)
January 2025
Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of Basque Country, UPV/EHU, 20018 San Sebastian, Spain.
We provide new experimental studies of the temperature dependence of the giant magnetoimpedance (GMI) effect and hysteresis loops of Fe-rich and Co-rich amorphous microwires with rather different room temperature magnetic properties and GMI effect features. We observed a remarkable modification of hysteresis loops and magnetic field dependence of the GMI ratio upon heating in both of the studied samples. We observed a noticeable improvement in the GMI ratio and a change in hysteresis loops from rectangular to inclined upon heating in Fe-rich microwire.
View Article and Find Full Text PDFHigh-pressure phase transition and amorphization of BaVO.
Dalton Trans
December 2024
Departamento de Física Aplicada-Instituto de Ciencia de Materiales, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Spain.
The structural evolution of metavanadate compounds under high pressure offers valuable insights into phase transitions and changes in material properties. This study explores the structural behavior of BaVO under pressures up to 12 GPa using powder X-ray diffraction and density-functional theory (DFT) simulations. The results indicate a phase transition from the ambient pressure orthorhombic phase (space group 222) to a monoclinic phase (space group 2) at 4 GPa, likely driven by the distortion of the vanadium oxide polyhedron.
View Article and Find Full Text PDFPredicting Drug-Polymer Compatibility in Amorphous Solid Dispersions by MD Simulation: On the Trap of Solvation Free Energies.
Mol Pharm
November 2024
Drug Discovery Sciences, Bayer AG, Aprather Weg 18a, Wuppertal 42113, Germany.
Amorphous solid dispersions (ASDs) are a prevalent method for increasing the bioavailability and apparent solubility of poorly soluble drugs. Consequently, extensive research, encompassing both experimental and computational approaches, has been dedicated to developing methods for assessing the key factors influencing their stability, notably drug-polymer interactions. A common computational approach to rank the compatibility of a drug with a set of solvents or polymers is to compare thermodynamic observables, such as solvation free energies at infinite dilution.
View Article and Find Full Text PDFDuctile and brittle yielding of athermal amorphous solids: A mean-field paradigm beyond the random-field Ising model.
Phys Rev E
October 2024
Institut für Theoretische Physik, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany and Department of Mathematics, King's College London, London WC2R 2LS, United Kingdom.
Amorphous solids can yield in either a ductile or brittle manner under strain: plastic deformation can set in gradually, or abruptly through a macroscopic stress drop. Developing a unified theory describing both ductile and brittle yielding constitutes a fundamental challenge of nonequilibrium statistical physics. Recently, it has been proposed that, in the absence of thermal effects, the nature of the yielding transition is controlled by physics akin to that of the quasistatically driven random field Ising model (RFIM), which has served as the paradigm for understanding the effect of quenched disorder in slowly driven systems with short-ranged interactions.
View Article and Find Full Text PDFEshelby problem in amorphous solids.
Phys Rev E
September 2024
Department of Chemical Engineering, IIT Ropar, Rupnagar, Punjab 140001, India.
The Eshelby problem refers to the response of a two-dimensional elastic sheet to cutting away a circle, deforming it into an ellipse, and pushing it back. The resulting response is dominated by the so-called Eshelby kernel, which was derived for purely elastic (infinite) material, but has been employed extensively to model the redistribution of stress after plastic events in amorphous solids with finite boundaries. Here, we discuss and solve the Eshelby problem directly for amorphous solids, taking into account possible screening effects and realistic boundary conditions.
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