Science News
from research organizations

Patterning oxide nanopillars at the atomic scale by phase transformation

Date:
October 15, 2015
Source:
Tohoku University
Summary:
Scientists have carried out a study aimed at precisely controlling phase transformations with high spatial precision, which represents a significant step forward in realizing new functionalities in confined dimensions. Such a precise control of phase transformations opens up new avenues for materials design and processing, as well as advanced nanodevice fabrication.
Share:
FULL STORY

Researchers at Tohoku University's Advanced Institute for Materials Research (AIMR) have carried out a collaborative study aimed at precisely controlling phase transformations with high spatial precision, which represents a significant step forward in realizing new functionalities in confined dimensions.

The team, led by Prof. Yuichi Ikuhara, applied the focused electron beam of a scanning transmission electron microscope (STEM) to irradiate SrNbO3.4 crystals, and demonstrated a precise control of a phase transformation from layered SrNbO3.4 to perovskite SrNbO3 at the atomic scale.

Such a precise control of phase transformations opens up new avenues for materials design and processing, as well as advanced nanodevice fabrication. Full results of the study have been published in Nano Letters.

Phase transformations in crystalline materials are of primary fundamental interest and practical significance in a wide range of fields, including materials science, information storage and geological science. To date, it remains highly desirable to precisely tailor the phase transformations in a material due to their potential impact on macroscopic properties and thus many advanced applications.

Despite decades of efforts, precisely controlling phase transformations at the atomic scale still poses a significant challenge due to the intricacies of governing thermodynamic conditions with atomic precision. Recent technical advances in aberration-corrected STEM offer fertile new ground for probing samples by a focused sub-Angström electron beam, opening an avenue for precisely triggering phase transformations.

This work has demonstrated a successful control of a phase transformation from the layered SrNbO3.4 to the perovskite SrNbO3 with atomic precision by manipulating a focused sub-Angström electron beam to any selectable region.

Such a concept -- of a precise control of phase transformations with an atomic spatial precision -- should be, in principle, applicable not only to SrNbO3.4/SrNbO3 but also to other materials, finding applications in material processing and nanodevice fabrication.

Key points :

  • Precisely controlling phase transformation with high spatial precision
  • Patterning oxide nanopillars at the atomic scale by phase transformation

Story Source:

Materials provided by Tohoku University. Note: Content may be edited for style and length.


Journal Reference:

  1. Chunlin Chen, Zhongchang Wang, Frank Lichtenberg, Yuichi Ikuhara, Johannes Georg Bednorz. Patterning Oxide Nanopillars at the Atomic Scale by Phase Transformation. Nano Letters, 2015; 15 (10): 6469 DOI: 10.1021/acs.nanolett.5b01847

Cite This Page:

Tohoku University. "Patterning oxide nanopillars at the atomic scale by phase transformation." ScienceDaily. ScienceDaily, 15 October 2015. <www.sciencedaily.com/releases/2015/10/151015120027.htm>.
Tohoku University. (2015, October 15). Patterning oxide nanopillars at the atomic scale by phase transformation. ScienceDaily. Retrieved May 25, 2017 from www.sciencedaily.com/releases/2015/10/151015120027.htm
Tohoku University. "Patterning oxide nanopillars at the atomic scale by phase transformation." ScienceDaily. www.sciencedaily.com/releases/2015/10/151015120027.htm (accessed May 25, 2017).

RELATED STORIES