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Structure of solids and liquids is the study of the physical properties of matter in which there is a non-negligible interaction between the constituent atoms or molecules. While the atoms or molecules in a liquid are free to move around, those in solids are limited to vibrating about a fixed point.
The thermalization of acoustic phonons after photoexcitation is traced by electron pulses in TiSe2, and the excitonic contribution to the structural order parameter of the material’s charge density wave phase is quantified.
The molten structure of plutonium oxide—a component of mixed oxide nuclear fuels—is measured, showing some degree of covalent bonding. Its atomic structure is similar to that of cerium oxide, which could be a non-radioactive structural surrogate.
Manipulating the electronic properties of topological semimetals is a central goal of modern condensed matter physics research. Here, the authors demonstrate how a high-entropy engineering approach allows for the tuning of the crystal structure and the electronic states in a Dirac semimetal.
The structure of a commercially important glass-ceramic ZrO2-doped lithium aluminosilicate system during its initial nucleation stage was investigated by an X-ray multiscale analysis which enables us to observe the structure from the atomic to the nanometer scale by using diffraction, small-angle scattering, absorption, and anomalous scattering techniques. The combinatorial approach revealed that the formation of edge sharing between the ZrOx polyhedra and (Si/Al)O4 tetrahedra, and that the Zr-centric periodic structure in which the local structure of the Zr4+ ions resembled a cubic or tetragonal ZrO2 crystalline phase was potentially the initial crystal nucleus for the Zr-doped lithium aluminosilicate glass-ceramic.
Many volatile elements are depleted in the bulk silicate Earth. Here, the authors found that these volatile elements tend to react with Fe under pressure and may be sequestered within Earth’s core by forming substitutional Fe alloys.
The shape and trajectory of a crack plays a crucial role in material fracture. High-precision experiments now directly capture this phenomenon, unveiling the intricate 3D nature of cracks.
The atomic reconstruction and stacking arrangement in twisted trilayer graphene with a range of varying twist angles are elucidated by four-dimensional scanning transmission electron microscopy, revealing the hierarchical moiré of moiré superstructures that govern the structural symmetry at different length scales.
Ageing is a non-linear, irreversible process that defines many properties of glassy materials. Now, it is shown that the so-called material-time formalism can describe ageing in terms of equilibrium-like properties.
Two-dimensional crystals have revolutionized fundamental research across a staggering range of disciplines. We take stock of the progress gained after twenty years of work.
Machine learning interatomic potentials (MLIPs) enable materials simulations at extended length and time scales with near-ab initio accuracy. They have broad applications in the study and design of materials. Here, we discuss recent advances, challenges, and the outlook for MLIPs.