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Phase Diagram, Glassy Dynamics and Crystallization Kinetics of the Biobased Polyester Poly(ethylene 2,5-furanoate) (PEF).
Macromolecules
December 2024
Department οf Physics, University οf Ioannina, Ioannina 45110, Greece.
We report the pressure-temperature (-) phase diagram, the origin of the subglass dynamics, and the crystallization kinetics of the biobased polyester poly(ethylene 2,5-furanoate) (PEF), through dielectric spectroscopy (DS) measurements performed as a function of temperature and pressure. The phase diagram comprises four different "phases"; glass, quenched melt, crystalline, and normal melt. The cold crystallization temperature, , increases linearly with pressure (according to the Clausius-Clapeyron equation) as / ∼ 240 K·GPa and is accompanied by a small change in specific volume (Δ = 0.
View Article and Find Full Text PDFMethylammonium Lead Iodide across Physical Space: Phase Boundaries and Structural Collapse.
J Phys Chem Lett
December 2024
Materials Physics Center, CSIC-UPV/EHU, Paseo de Manuel Lardizabal, 5, 20018 Donostia - San Sebastian, Spain.
Hybrid perovskites exhibit complex structures and phase behavior under different thermodynamic conditions and chemical environments, the understanding of which continues to be pivotally important for tailoring their properties toward improved operational stability. To this end, we present for the first time a comprehensive neutron and synchrotron diffraction investigation over the pressure-temperature phase diagram of the paradigmatic hybrid organic-inorganic perovskite methylammonium lead iodide (MAPbI). This ambitious experimental campaign down to cryogenic temperatures and tens of kilobars was supported by extensive molecular dynamics simulations validated by the experimental data, to track the structural evolution of MAPbI under external physical stimuli at the atomic and molecular levels.
View Article and Find Full Text PDFPhase separation of planetary ices explains nondipolar magnetic fields of Uranus and Neptune.
Proc Natl Acad Sci U S A
December 2024
Department of Earth and Planetary Science, University of California, Berkeley, CA 94720.
The Voyager spacecraft discovered that the ice giants Uranus and Neptune have nondipolar magnetic fields, defying expectations that a thick interior layer of planetary ices would generate strong dipolar fields. Stanley and Bloxham showed that nondipolar fields emerge if the magnetic field is only generated in a thin outer layer. However, the origin and composition of this dynamo active layer has so far remained elusive.
View Article and Find Full Text PDFUnusual metallic state in superconducting A15-type LaH.
Natl Sci Rev
December 2024
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Hydride superconductors continue to fascinate the communities of condensed matter physics and material scientists because they host the promising near room-temperature superconductivity. Current research has concentrated on the new hydride superconductors with the enhancement of the superconducting transition temperature ( ). The multiple extreme conditions (high pressure/temperature and magnetic field) will introduce new insights into hydride superconductors.
View Article and Find Full Text PDFInvestigation on Melting Curves and Phase Diagrams for CaO Using Deep Learning Potentials.
J Phys Chem A
October 2024
School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
Article Synopsis
- Melting in deep rocky areas of planets is crucial for various geological processes like planet formation, seismic activity, and magnetic field generation, which helps us understand how planets evolve.
- The study investigates the melting curves and phase diagrams of CaO, a mineral relevant to Earth's lower mantle, using a deep learning model alongside molecular dynamics and first-principles methods.
- Melting temperatures of CaO were determined at different pressures, revealing values of 975, 850, and 755 K at zero pressure, and the research provides melting phase diagrams for CaO across a pressure range of 0-135 GPa.
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