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The laser annealing process for AuNi nanoparticles has been visualized using coherent X-ray diffraction imaging (CXDI). AuNi bimetallic alloy nanoparticles, originally phase separated due to the miscibility gap, transform to metastable mixed alloy particles with rounded surface as they are irradiated by laser pulses. A three-dimensional CXDI shows that the internal part of the AuNi particles is in the mixed phase with preferred compositions at ∼29 at% of Au and ∼90 at% of Au.
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http://dx.doi.org/10.1107/S1600577520001617 | DOI Listing |
J Chem Phys
September 2025
Center for Advanced Structural Materials, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
Increasing evidences show the significance of low melting entropy in glass formation of substances. Our previous studies have uncovered the strong dependence between melting entropy in the eutectic mixtures and mixing enthalpy, which has been serving as an important reference for glass formation, showing that negative mixing enthalpy largely reduces the melting entropy. In this paper, we focused on the question as to how melting entropy is associated with another classical glass formation criterion of molecule/atom size difference of components.
View Article and Find Full Text PDFJ Am Chem Soc
September 2025
Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.
Layered van der Waals (vdW) materials, characterized by their interlayer vdW gaps, offer exceptional tunability of magnetic properties via intercalation chemistry. A wide range of magnetic behaviors have been observed in nonmagnetic transition-metal dichalcogenides intercalated with magnetic atoms. Beyond the incorporation of magnetic ions, we propose the controlled alkali-ion intercalation of intrinsic vdW magnets as a strategy to probe and manipulate spin populations and exchange interactions within individual magnetic layers.
View Article and Find Full Text PDFInorg Chem
September 2025
Department of Chemical and Food, Industrial Research Institute of Ishikawa, 2-1, Kuratsuki, Kanazawa, Ishikawa 920-8203, Japan.
This study demonstrates the mutual phase stability and chemical inertness of hexacelsian─the metastable phase of BaAlSiO with a layered structure─and yttria-stabilized zirconia (YSZ) across a wide temperature range up to 1600 °C, through solid-state reactions between kaolinite and BaCO, with or without YSZ. Hexacelsian remained without transformation to celsian─the stable BaAlSiO phase without a layered structure─under heating when copresent with ZrO. Additionally, while YSZ alone shows both tetragonal and monoclinic ZrO phases upon calcination, only the tetragonal phase is retained when calcined in the presence of hexacelsian.
View Article and Find Full Text PDFPhys Chem Chem Phys
August 2025
Department of Physical and Chemical Sciences, University of LAquila, LAquila 67100, Italy.
One of the leading hypotheses explaining water's anomalies is a metastable liquid-liquid phase transition (LLPT) at high pressure and low temperatures, which remains experimentally elusive due to homogeneous nucleation. Infrared spectroscopy experiments have shown that adding hydrazinium trifluoroacetate to water induces a sharp, reversible LLPT at ambient pressure, potentially originating from the same underlying mechanism as in pure water. In a previous work, we demonstrated that this transition can be attributed to the behavior of pure water only when nanosegregation of the aqueous component is brought into play.
View Article and Find Full Text PDFCryst Growth Des
August 2025
Centre for Device Thermography, University of Bristol, Bristol BS8 1TL, U.K.
GaO thin films were deposited simultaneously on (112̅0) -plane, (101̅0) -plane, (0001) -plane, and (011̅2) -plane sapphire substrates using metal-organic chemical vapor deposition (MOCVD) and characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The different surface energy and strain conditions imposed by each sapphire plane make the choice of substrate orientation critical to the stabilization of the α-phase. β-GaO nucleation was found to be preferential over α-GaO on sapphire orientations with <11̅00> α-AlO present (c- and -planes) when grown under the same conditions.
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