Nano Focus: Crystalline oxides sculpted at the nanoscale
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ty and level of precision necessary for many modern devices. In a recent issue of Small (DOI: 10.1002/smll.201502048), a group of researchers at Oak Ridge National Laboratory demonstrate a novel method of building 3D structures at the atomic level. Stephen Jesse and colleagues describe in situ arrangement of atomic-scale surface/subsurface crystalline oxide structures using scanning transmission electron microscopy (STEM). The researchers begin with a layer of oxide material (such as SrTiO3), rendered amorphous by ion bombardment. This amorphous layer of material then facilitates the study. The researchers found that they were able to induce an amorphous-to-crystalline phase transformation simply by using the high-energy electron probe in STEM. Starting from a seed area of crystalline material and drawing outward, the researchers were able to promote directed epitaxial crystallization (having the same crystallographic orientation as the seed crystal) of the amorphous material. Through control
MRS BULLETIN
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VOLUME 41 • JANUARY 2016
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www.mrs.org/bulletin
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