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 Move over, Superman! NIST method sees through concrete to detect early-stage corrosion
27.04.2017 | National Institute of Standards and Technology (NIST)

nachricht Control of molecular motion by metal-plated 3-D printed plastic pieces
27.04.2017 | Ecole Polytechnique Fédérale de Lausanne

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>