<報文>ピーナツ形単分散ヘマタイト粒子の構造解析

概要

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Structure of monodispersed hematite (α-(Fe)_2O_3) particles with peanut-type produced by the gel-sol method was analyzed using scanning electron microscopes and transmission electron microscopes. Electron micrographs of thin sections prepared by an ultra-microtome directly revealed the polycrystallinity of the particles, and they also clearly showed size distribution and arrangement of subcrystals as components of the particles. The subcrystals inside the particles had a rod-like shape whose width and length were in the range of 5nm to 12nm and about 100nm, respectively. On the other hand, the subcrystals at the surface had a different rod-like shape with relatively round surfaces, and their width was in the range of 12 to 20nm and their length was less than 50nm. Furthermore, it was found that the long axis of the subcrystals was paralell to the c-axis of the hematite and the crystallographic orientations of adjacent subcrystals slightly differed from each other, resulting in the radially orientend arrangement of the subcrystals. Based on the experimental results, growth process of the monodispersed peanut-type hematite particles was briefly disussed.hematitemorphological analysisscanning electron microscopytransmission electron microscopylattice imageultra-microtomemonodispersed particles
東北大学の論文
1994-03-30