Strategy to control magnetic coercivity by elucidating crystallization pathway-dependent microstructural evolution of magnetite mesocrystals.,Nature Communications

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Strategy to control magnetic coercivity by elucidating crystallization pathway-dependent microstructural evolution of magnetite mesocrystals.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-15 , DOI: 10.1038/s41467-019-14168-0
Bum Chul Park _{1,

2} , Jiung Cho ₃ , Myeong Soo Kim ₄ , Min Jun Ko ₁ , Lijun Pan ₁ , Jin Yeong Na ₃ , Young Keun Kim _{1,

4}

Affiliation

Mesocrystals are assemblies of smaller crystallites and have attracted attention because of their nonclassical crystallization pathway and emerging collective functionalities. Understanding the mesocrystal crystallization mechanism in chemical routes is essential for precise control of size and microstructure, which influence the function of mesocrystals. However, microstructure evolution from the nucleus stage through various crystallization pathways remains unclear. We propose a unified model on the basis of the observation of two crystallization pathways, with different ferric (oxyhydr)oxide polymorphs appearing as intermediates, producing microstructures of magnetite mesocrystal via different mechanisms. An understanding of the crystallization mechanism enables independent chemical control of the mesocrystal diameter and crystallite size, as manifested by a series of magnetic coercivity measurements. We successfully implement an experimental model system that exhibits a universal crystallite size effect on the magnetic coercivity of mesocrystals. These findings provide a general approach to controlling the microstructure through crystallization pathway selection, thus providing a strategy for controlling magnetic coercivity in magnetite systems.

中文翻译：

通过阐明磁铁矿中晶的结晶途径相关的微观结构演变来控制磁矫顽力的策略。

介晶是较小晶粒的集合体，由于其非经典的结晶途径和新兴的集体功能而备受关注。了解化学途径中的中晶结晶机制对于精确控制尺寸和微观结构至关重要，这会影响中晶的功能。然而，从核阶段通过各种结晶途径的微观结构演变仍不清楚。我们在观察两个结晶途径的基础上，提出了一个统一的模型，其中出现了不同的（羟基）氧化铁多晶型物作为中间体，通过不同的机理产生了磁铁矿中晶的微观结构。对结晶机理的理解可以实现对中晶直径和微晶尺寸的独立化学控制，如一系列磁矫顽力测量所表明的。我们成功地实现了一个实验模型系统，该系统对介晶的磁矫顽力表现出通用的晶粒尺寸效应。这些发现为通过结晶途径的选择控制微观结构提供了一种通用方法，从而为控制磁铁矿系统中的磁矫顽力提供了一种策略。

更新日期：2020-01-15

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