Synthesis and Characterization of High-Entropy Dawsonite-Type Structures

化学 晶体结构 熵(时间箭头) 离子半径 热力学 结晶学 离子 物理 有机化学
作者
Amy J. Knorpp,P. Allegri,Shangxiong Huangfu,Alexander Vogel,Michael Stuer
出处
期刊:Inorganic Chemistry [American Chemical Society]
卷期号:62 (12): 4999-5007
标识
DOI:10.1021/acs.inorgchem.3c00179
摘要

High-entropy hydroxides are an emerging subcategory of high-entropy materials (HEMs), not only because they can serve as tailorable precursors to high-entropy oxides (HEOs) but also because they can have unique high-entropy properties themselves. Many hydroxide crystal structures that are important for various applications are yet to be studied within the context of high-entropy materials, and it is unknown if they can take a high-entropy form (typically five or more incorporated cations). One such material is the dawsonite-type structure, which is a material with applications in both catalysis and ceramics. This work focuses on the adaptation of a dawsonite-type structure (NH4M(OH)2CO3) into a high-entropy material. Through a coprecipitation synthesis method, dawsonite-type materials readily took a high-entropy form with five cations that were equimolar and homogeneously distributed. The specific chemistries investigated were Al, Cr, Fe, and Ga with a fifth cation that was varied with increasing ionic radius (In, Er, Ho, Y, Eu, Ce, La). High-entropy dawsonites also exhibit the ″memory effects″ of non-high-entropy dawsonites. This work extends the field of high-entropy materials to include a structure that can serve as a material platform for the synthesis of high-entropy catalytic materials and ceramic powders.
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