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Structure and chemical bonding in high-pressure potassium silver alloys.
Commun Chem
July 2024
Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada.
The high-pressure structures of K-Ag alloys were examples of pressure-induced electron transfer from the electropositive potassium to the electronegative silver. We re-examined the crystal and electronic structures of KAg, KAg, and KAg using powder X-ray diffraction and theoretical calculations. Our findings establish a connection between the morphologies of these three phases and the precursor face-centered cubic Ag.
View Article and Find Full Text PDFEnhanced elastic stability of a topologically disordered crystalline metal-organic framework.
Nat Mater
September 2024
Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, UK.
By virtue of their open network structures and low densities, metal-organic frameworks (MOFs) are soft materials that exhibit elastic instabilities at low applied stresses. The conventional strategy for improving elastic stability is to increase the connectivity of the underlying MOF network, which necessarily increases the material density and reduces the porosity. Here we demonstrate an alternative paradigm, whereby elastic stability is enhanced in a MOF with an aperiodic network topology.
View Article and Find Full Text PDFUnprecedented Richness of Temperature- and Pressure-Induced Polymorphism in 1D Lead Iodide Perovskite.
Small
September 2024
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, 01-224, Poland.
Inherent features of metal halide perovskites are their softness, complex lattice dynamics, and phase transitions spectacularly tuning their structures and properties. While the structural transformations are well described and classified in 3D perovskites, their 1D analogs are much less understood. Herein, both temperature- and pressure-dependent structural evolutions of a 1D AcaPbI perovskitoid incorporating acetamidinium (Aca) cation are examined.
View Article and Find Full Text PDFTrimethylamine-N-oxide depletes urea in a peptide solvation shell.
Proc Natl Acad Sci U S A
April 2024
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom.
Article Synopsis
- TMAO and urea are metabolites used by marine animals to regulate cell volume in salty conditions, with urea acting as a denaturant and TMAO serving as a protective osmolyte against this denaturation.
- The spatial interactions between TMAO, urea, and proteins are crucial, as TMAO can help stabilize proteins by depleting urea from their surfaces.
- Research using neutron diffraction showed that TMAO effectively removes urea from a tripeptide's surface, enhancing hydrogen bonding in the solution and supporting the idea that TMAO stabilizes proteins in the presence of urea.
Pressure-induced phase transition of LuTiOand LuCeTiOpyrochlores.
J Phys Condens Matter
January 2024
School of Nuclear Science and Technology, University of South China, Hengyang 421001, People's Republic of China.
This study utilizes both experimental and computational approaches to investigate the performance of LuTiO(LTO) and LuCeTiO(LCTO) pyrochlores under high pressure. The structural changes of LTO and LCTO pyrochlores were characterized usingsynchrotron x-ray diffraction (SXRD) andRaman spectroscopy at pressures up to 44.6 GPa.
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