擬似立方体型単分散ヘマタイト粒子の電子顕微鏡による形態及び構造評価

概要

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Morphology and structure of monodispersed pseudocubic hematite (α-Fe_2O_3) particles produced by the gel-sol method were determined using scanning electron microscopy coupled with transmission electron microscopy. From the electron microscope images of external shapes and thin sections of a particle prepared by an ultramicrotome, the c-axis of a particle appeared to correspond to the longest diagonal axis of a particle and the corners of a particle on this axis were found more deviated from a squared shape. Furthermore, high-resolution electron microscope images of thin sections directly revealed the polycrystallinity of the particles, and they also clearly showed the arrangement of subcrystals and their crystallographic orientations. The subcrystals near the surface of a particle indicated a squared shape bounded by {011^^^-2} planes, and then their width was about 16 nm and their length was about 90 nm. Also, adsorbed Cl^- ions proved by EDX analysis were incorporated into the pseudocubic hematite particles as a shape controller.hematitemorphologymonodispersed particlesscanning electron microscopytransmission electron microscopyultramicrotomesubcrystals
東北大学の論文