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首页> 外文会议>Symposium on Epitaxial Oxide Thin Films III March 31-April 2, 1997, San Francisco, California,U.S.A >The (001) surface of Fe_3O_4 grown epitaxially on MgO and characterized by scanning tunneling microscopy
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The (001) surface of Fe_3O_4 grown epitaxially on MgO and characterized by scanning tunneling microscopy

机译：Fe_3O_4的（001）表面在MgO上外延生长并通过扫描隧道显微镜进行表征

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摘要

Spinel Fe_3O_4 contains two sites for iron: tetrahedrally coordinated sites containing Fe~3+ ions and octahedrally coordinated sites containing a mixture of Fe~2+ and Fe~3+ ions. Scanning tunneling microscopy performed on the (001) surface of Fe_3O-4, grown epitaxially on MgO, shows localized charge density at the tetrahedral sites. the images show that the p(1x1) surface reconstruction (also observed during molecular beam epitaxy of Fe_3O_4) is produced by a displacement of the two tetrahedrally coordinated Fe ions on the unit cell surface from their bulk positions toward each other. The octahedral Fe ions are imaged as extended rows of charge density, with no resolution of atom-size features along the rows. This slight corrugationof electron charge density along the octahedral sites is consistent with the original conjectures explaining the high electrical conductivity in bulk Fe_3O_4: electrons move by hopping between the Fe~3+ and Fe~2- atoms along the octahedral rows of Fe ions.
机译：尖晶石Fe_3O_4包含两个铁位点：包含Fe〜3 +离子的四面体配位位点和包含Fe〜2 +和Fe〜3 +离子的八面体配位位点。在外延生长在MgO上的Fe_3O-4的（001）表面上进行的扫描隧道显微镜显示了四面体位置的局部电荷密度。图像显示p（1x1）表面重建（也在Fe_3O_4的分子束外延过程中观察到）是由于晶胞表面上的两个四面体配位的Fe离子从其本体位置朝彼此移位而产生的。八面体Fe离子被成像为扩展的电荷密度行，沿行没有原子尺寸特征的分辨率。电子电荷密度沿八面体位置的这种轻微波纹与最初的推测相符，该推测解释了本体Fe_3O_4的高电导率：电子通过沿着Fe离子的八面体行在Fe〜3 +和Fe〜2-原子之间跳跃而移动。

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