Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Ferroelectric oxides do the twist

Advanced Materials
Engineered electric polarizations are indicated by the gray arrows, a "twisting-like" distortion of the corner-connected oxygen octahedral that is common to many perovskite oxides. First-principles calculations reveal that carefully designed atomic layering, represented by alternating gold and magenta spheres forming an atomic-scale superlattice, allows the octahedral rotations to induce ferroelectricity.
Advanced Materials

Engineered electric polarizations are indicated by the gray arrows, a "twisting-like" distortion of the corner-connected oxygen octahedral that is common to many perovskite oxides. First-principles calculations reveal that carefully designed atomic layering, represented by alternating gold and magenta spheres forming an atomic-scale superlattice, allows the octahedral rotations to induce ferroelectricity.

Abstract:
Some materials, by their nature, do what we want them to do -- notably, the ubiquitous, semiconducting silicon found in almost every electronic device. But sometimes, naturally occurring materials need a little nudge -- or in the case of recent Cornell research, a twist -- to make them useful.

Ferroelectric oxides do the twist

Ithaca, NY | Posted on April 11th, 2012

Assistant professor of applied and engineering physics Craig Fennie and Drexel University's James Rondinelli have published a method for turning a class of ceramic materials called perovskites into a material that's ferroelectric. The work was published April 10 by Advanced Materials and also will be featured on the printed journal's inside cover.

Ferroelectricity is a property in which a spontaneous electric polarization can be flipped by applying a small electric field, useful for low-power memory and switching devices. Traditional ferroelectric mechanisms, however, are often chemically incompatible with such phenomena as ferromagnetism, limiting their use in new types of multifunctional devices.

The researchers' theory-only work, which employed density functional calculations, concluded that ferroelectricity in perovskites can be realized if their atomic structures are manipulated at the nanometer length scale and by slicing them only a few atoms thin, letting the natural twisting of their corner-shared octahedra -- the basic structural unit of perovskite crystals -- do the rest.

The researchers' engineered electric polarizations are the result of stacking chemically different perovskites into atomically thin striped-patterns, which allow their normal rotational patterns to induce ferroelectricity.

"In the past, those rotations and tilts didn't do anything, but by combining them in this way, they can be coupled to an electric field through polarization," Fennie said. "This is the first step in the broad field of using rotations that couple to an applied electric field to control the properties of materials."

Fennie and Rondinelli transformed their theoretical conclusions into experimental guidelines for chemists and materials scientists, with the goal of enabling ferroelectric materials by design.

"The strategy we applied in this work provides a framework for rapid materials discovery of functional properties in a variety of crystal families in advance of materials synthesis," Rondinelli said.

According to Fennie, the work illustrates that theory will play a pivotal role in identifying new material systems for integration into next-generation technologies; theoretical studies of materials are no longer limited to after-the-fact analysis of experimental data.

The research was supported by the U.S. Department of Energy, Basic Energy Sciences.

####

For more information, please click here

Contacts:
Anne Ju


Chronicle Online
312 College Ave.
Ithaca, NY 14850
607.255.4206

Copyright © Cornell University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Chemistry

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Govt.-Legislation/Regulation/Funding/Policy

'Electronic skin' could improve early breast cancer detection October 29th, 2014

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

Tiny carbon nanotube pores make big impact October 29th, 2014

Microrockets fueled by water neutralize chemical and biological warfare agents October 29th, 2014

Discoveries

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Materials/Metamaterials

Production of Biocompatible Polymers in Iran October 30th, 2014

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

Watching the hidden life of materials: Ultrafast electron diffraction experiments open a new window on the microscopic world October 27th, 2014

Polymeric Scaffold Recreates Bladder Tissue October 27th, 2014

Announcements

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Production of Biocompatible Polymers in Iran October 30th, 2014

Amorphous Coordination Polymer Particles as alternative to classical nanoplatforms for nanomedicine October 30th, 2014

Energy

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

New solar power material converts 90 percent of captured light into heat: SunShot Project aims to make solar cost competitive October 29th, 2014

New Compact SIMS at 61st AVS | Visit us on Booth 311 October 28th, 2014

New evidence for an exotic, predicted superconducting state October 27th, 2014

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE