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Crystallographic Dimensionality Determines the Electrochemical Reaction Mechanism in Alkali Transition-Metal Chlorides.
J Am Chem Soc
November 2024
Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States.
Intense research efforts on transition metal chalcogenides (oxides and sulfides), pnictides (nitrides and phosphides), and fluorides have demonstrated the complex, intertwined effects of structural and chemical changes on their electrochemical response leading to intercalation, conversion, or displacement reactions when reacting with lithium. Prior efforts largely left halides unexplored due to their heightened solubility in classical liquid electrolytes. In this work, we employ superconcentrated electrolytes to demonstrate the composition- and structure-dependent electrochemical reactivity of AMCl compounds (A = Li or Na and M = Cr, Mn, Fe, and Co).
View Article and Find Full Text PDFCobalt-based pyroxenes: A new playground for Kitaev physics.
Proc Natl Acad Sci U S A
October 2024
M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, Ekaterinburg 620990, Russia.
Article Synopsis
- Recent research shows that cobaltites may serve as a valuable avenue for studying Kitaev physics in honeycomb structures and the Ising model in weakly linked chains.
- The study investigates the magnetic properties of SrCoGeO using neutron scattering, ab initio methods, and linear spin-wave theory to propose a modified Kitaev model for the interactions in this material.
- Findings indicate that external magnetic fields can shift the material's magnetic ordering and suggest modified pyroxenes could offer new insights into Kitaev physics.
Coupling Antisite Defect and Lattice Tensile Stimulates Facile Isotropic Li-Ion Diffusion.
Adv Mater
August 2024
School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.
Despite widely used as a commercial cathode, the anisotropic 1D channel hopping of lithium ions along the [010] direction in LiFePO prevents its application in fast charging conditions. Herein, an ultrafast nonequilibrium high-temperature shock technology is employed to controllably introduce the Li-Fe antisite defects and tensile strain into the lattice of LiFePO. This design makes the study of the effect of the strain field on the performance further extended from the theoretical calculation to the experimental perspective.
View Article and Find Full Text PDFLayered Hydride LiH with a Pressure-Insensitive Superconductivity.
Inorg Chem
May 2024
State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China.
For hydride superconductors, each significant advance is built upon the discovery of novel H-based structural units, which in turn push the understanding of the superconducting mechanism to new heights. Based on first-principles calculations, we propose a metastable LiH with a wavy H layer composed of the edge-sharing pea-like H rings at high pressures. Unexpectedly, it exhibits pressure-insensitive superconductivity manifested by an extremely small pressure coefficient (d/d) of 0.
View Article and Find Full Text PDF0-D and 1-D Perovskite-like Hybrid Bismuth(III) Iodides.
Chem Asian J
April 2024
New Chemistry Unit, International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India.
Low-dimensional hybrid bismuth halide perovskites have recently emerged as a class of non-toxic alternative to lead perovskites with promising optoelectronic properties. Here, we report three hybrid bismuth(III)-iodides: 0-D (HDAC)BiI ⋅ 6HO (HDAC_Bi_I), 0-D (HDAF)BiI ⋅ 2I ⋅ 2I ⋅ 6HO (HDAF_Bi_I), and 1-D (HDAP)BiI (HDAP_Bi_I) (where HDAC=trans-1,4-diammoniumcyclohexane; HDAF=2,7-diammoniumfluorene and HDAP=1,5-diammoniumpentane). Their synthesis, single-crystal X-ray structures, and photophysical properties are reported.
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