Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researchers Discover New, Controllable State in Ferroelectric Nanowires

01.04.2010
Researchers at the University of Arkansas and their colleagues have discovered a new phase in ferroelectric nanowires that could be controlled to optimize important properties for future electronic devices.

Lydie Louis and Laurent Bellaiche of the University of Arkansas; P. Gemeiner, G. Geneste and B. Dkhil of the École Centrale Paris; Inna Ponomareva of the University of South Florida; and W. Ma and N. Setter of the Swiss Federal Institute of Technology reported their findings in Nano Letters.

Ferroelectric materials are used in medical ultrasound to examine fetuses and internal organs, in military sonar for underwater navigation and detection, and in cell phones. These materials have a spontaneous charge separation that allows them to generate an electric field when their shape is changed — thus mechanical energy becomes electrical energy. Potential applications for ferroelectric nanowires include data storage memories and energy harvesting devices.

“Industry wants materials to be multifunctional, to have many different properties at the same time,” said Louis. “Therefore we have to understand the properties that arise under different conditions.”

Louis and her colleagues performed theoretical calculations and conducted experiments and found that the ferroelectric nanowires went through different structural phases at different temperatures, including a new phase not seen before.

“We also found out we could control the phase with a certain screening parameter,” she said. The scientists could alter the direction of polarization within this phase by changing the magnitude of the depolarization field and the size of the nanostructure itself, implying that one can “tune” the physical properties of these nanowires.

The researchers used X-ray diffraction and Raman spectroscopy to examine ferroelectric nanowires made from one material, potassium niobate, and performed first-principles-based calculations on nanowires based on another ferroelectric material with similar properties, barium titanate, by using the Star of Arkansas, a supercomputer at the University of Arkansas.

The theoretical calculations and experimental findings complemented one another.

“This shows the reliability of our computations,” Louis said.

Louis is a graduate student in a joint doctoral program between the University of Arkansas and École Centrale de Paris in France, which is sponsored by the National Science Foundation. Bellaiche is the Twenty-First Century Professor in Nanotechnology and Science Education in the J. William Fulbright College of Arts and Sciences.

CONTACTS:
Laurent Bellaiche, Twenty-First Century Professor in Nanotechnology and Science Education
J. William Fulbright College of Arts and Sciences
479-575-6425, laurent@uark.edu
Lydie Louis, graduate research assistant, physics
J. William Fulbright College of Arts and Sciences
louis.lydie@gmail.com
Melissa Lutz Blouin, director of science and research communications
University Relations
479-575-5555, blouin@uark.edu

Melissa Lutz Blouin | Newswise Science News
Further information:
http://www.uark.edu

More articles from Materials Sciences:

nachricht An innovative high-performance material: biofibers made from green lacewing silk
20.01.2017 | Fraunhofer-Institut für Angewandte Polymerforschung IAP

nachricht Treated carbon pulls radioactive elements from water
20.01.2017 | Rice University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>