Control of nanostructures by cooling rate in spinel-type manganese oxide ZnMnGaO4
Control of nanostructures by cooling rate in spinel-type manganese oxide ZnMnGaO4
复制标题
DOI：
10.35848/1347-4065/abb20f
复制
发表时间：
2020-09
影响因子：
1.5
通讯作者：
M. Ishimatsu;H. Tabuki;Y. Horibe
中科院分区：
文献类型：
--
作者：
M. Ishimatsu;H. Tabuki;Y. Horibe
通过透射电子显微镜(选区电子衍射和明暗场成像)和X射线衍射研究了不同降温速率对尖晶石型锰氧化物ZnMnGaO4纳米结构的可控性。淬火样品显示出一种花呢图案，表明在纳米尺度上两相共存。随着冷却速度从淬火降低到1°C h−1，观察到了纳米结构从细小的孪晶结构向棋盘状纳米结构的转变，随后出现了层状纳米结构。这表明锰离子的扩散伴随着Jahn-Teller扭曲在该体系纳米结构的形成中起着重要作用。
Controllability of the nanostructures in spinel-type manganese oxide ZnMnGaO4 by changing cooling rate was studied via transmission electron microscopy (with selected area electron diffraction and bright- and dark-field imaging) as well as X-ray diffraction. The Quench sample exhibited a tweed pattern, suggesting the coexistence of two phases at the nanometer scale. The nanostructural changes from a fine twin structure to a checkerboard nanostructure, followed by the emergence of a lamellar-type nanostructure, were clearly observed as the cooling rate decreased from quenching to 1 °C h−1. It was suggested that the diffusion of manganese ions accompanied by the Jahn–Teller distortion play an important role in the formation of nanostructures of this system.