Sheets of electrons that are highly mobile in only two dimensions, known as 2D electron gas, have unique properties that can be leveraged for faster and novel electronic devices. Researchers have been exploring 2D electron gas, which was only discovered in 2004, to see how it can be used in superconductors, actuators, and electronic memory devices, among others.

Researchers at Japan's Tohoku University, with an international team of colleagues, recently identified the atomic structure of a group of perovskite-related materials showing interesting 2D conductive properties.

The materials are made of strontium, niobium and oxygen atoms, with a layered structure derived from perovskite. These strontium niobate compounds show promise for developing advanced electronics because of their 'quasi-one-dimensional' metallic conductivity.

Yuichi Ikuhara of Tohoku University's Advanced Institute for Materials Research with Johannes Georg Bednorz of Zurich Research Laboratory and colleagues used atom-resolved scanning transmission electron microscopy combined with theoretical calculations to learn how adding oxygen atoms to strontium niobates affects their conductivity. Four different materials formed depending on the concentration of oxygen atoms.

The researchers found that three of the materials were conductors of electricity while the fourth was an insulator. At the atomic scale, they discovered the materials were formed of alternating chain-like and zigzag slabs.

Depending on the concentration of oxygen atoms, the chain-like slabs were two, three, or four layers thick, sometimes varying within the same material. The zigzag slabs were insulating layers in all the materials, while the chain-like slabs were conducting layers in three of the four materials.

The team determined that local electrical conductivity within the material directly depended on the shapes of the niobate octahedra in the layers. When positive ions of niobium were displaced toward the centers of the niobate octahedra, a local conducting nature was induced.

2D conducting layers are commonly formed by creating an interface between two insulators. It should now be possible to achieve the same goal by segmenting 3D conducting materials into stacks of 2D conducting layers separated by insulating layers, the researchers say in their study published in the journal ACS Nano. This could lead to applications in the development of 2D electrical conducting materials and devices.

Research paper

Related Links
Tohoku University
Space Technology News - Applications and Research

Tweet

Thanks for being here; We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor $5 Billed Once credit card or paypal		SpaceDaily Monthly Supporter $5 Billed Monthly paypal only

Atomic structure of ultrasound material not what anyone expected
Raleigh, NC (SPX) Feb 26, 2018
Lead magnesium niobate (PMN) is a prototypical "relaxor" material, used in a wide variety of applications, from ultrasound to sonar. Researchers have now used state-of-the-art microscopy techniques to see exactly how atoms are arranged in PMN - and it's not what anyone expected. "This work gives us information we can use to better understand how and why PMN behaves the way it does - and possibly other relaxor materials as well," says James LeBeau, an associate professor of materials science and en ... read more