Nav: Home

Modeling crystal behavior: Towards answers in self-organization

September 17, 2018

Tokyo - The electrical and mechanical responses of crystal materials, and the control of their coupled effect, form one of the central themes in material science. They are vital to applications such as ultrasonic generators and non-volatile memory. However, despite knowledge of how to control such materials being widely demonstrated in practice, to date the physical principle behind the controllability through lattice organization, remains undefined. Researchers at The University of Tokyo Institute of Industrial Science have sought to change this by creating a model based on the conflict between different lattice interactions. Their findings were published in PNAS.

Crystal structures comprise atoms or molecules and the particular organization and interaction of these component parts dictate the properties of the bulk material. Ferroelectric and antiferroelectric ordering describe long-range dipole based arrangements of molecules in a lattice. Materials exhibiting such order can show electrical switchability, as well as interesting cross-coupling effects; therefore, understanding their behavior has tangible practical benefits.

"Our model was designed to probe the simple physical principle that controls ferroelectric and antiferroelectric order by varying the shape of the molecules in a dipolar lattice," study corresponding author Hajime Tanaka says. "We also compared the resulting effects on the electrical, dynamic, and thermal properties."

Creating a simple self-organization model based on spherical particles with a permanent dipole allowed the researchers to establish the importance of the energetic frustration between the anisotropic steric and dipolar interactions in the self-organization process.

"Understanding the underlying principle that governs ferroelectric and antiferroelectric organization and transitions is key to achieving optimal control of the properties that are already being utilized in many different applications," lead author Kyohei Takae says. "By carrying out thorough modeling of these systems we hope to be able to enhance the rational design of a wide range of materials including non-volatile memory devices--hard drives and flash memory--and electro-mechanical actuators, used in robotic instruments."

The findings are expected to provide important guidelines for the development of highly functional materials that show cross reaction in which electric/magnetic order and deformation or thermal response are combined, using substances showing phase transition between ferroelectric ordered phase and antiferroelectric ordered phase, or magnets.
-end-
The article, "Self-organization into ferroelectric and antiferroelectric crystals via the interplay between particle shape and dipolar interaction" was published in PNAS at DOI: 10.1073/pnas.1809004115.

About Institute of Industrial Science (IIS), the University of Tokyo

Institute of Industrial Science (IIS), the University of Tokyo is one of the largest university-attached research institutes in Japan.

More than 120 research laboratories, each headed by a faculty member, comprise IIS, with more than 1,000 members including approximately 300 staff and 700 students actively engaged in education and research. Our activities cover almost all the areas of engineering disciplines. Since its foundation in 1949, IIS has worked to bridge the huge gaps that exist between academic disciplines and real-world applications.

Institute of Industrial Science, The University of Tokyo

Related Behavior Articles:

I won't have what he's having: The brain and socially motivated behavior
Monkeys devalue rewards when they anticipate that another monkey will get them instead.
Unlocking animal behavior through motion
Using physics to study different types of animal motion, such as burrowing worms or flying flocks, can reveal how animals behave in different settings.
AI to help monitor behavior
Algorithms based on artificial intelligence do better at supporting educational and clinical decision-making, according to a new study.
Increasing opportunities for sustainable behavior
To mitigate climate change and safeguard ecosystems, we need to make drastic changes in our consumption and transport behaviors.
Predicting a protein's behavior from its appearance
Researchers at EPFL have developed a new way to predict a protein's interactions with other proteins and biomolecules, and its biochemical activity, merely by observing its surface.
Spirituality affects the behavior of mortgagers
According to Olga Miroshnichenko, a Sc.D in Economics, and a Professor at the Department of Economics and Finance, Tyumen State University, morals affect the thinking of mortgage payers and help them avoid past due payments.
Asking if behavior can be changed on climate crisis
One of the more complex problems facing social psychologists today is whether any intervention can move people to change their behavior about climate change and protecting the environment for the sake of future generations.
Is Instagram behavior motivated by a desire to belong?
Does a desire to belong and perceived social support drive a person's frequency of Instagram use?
A 3D view of climatic behavior at the third pole
Research across several areas of the 'Third Pole' -- the high-mountain region centered on the Tibetan Plateau -- shows a seasonal cycle in how near-surface temperature changes with elevation.
Witnessing uncivil behavior
When people witness poor customer service, a manager's intervention can help reduce hostility toward the company or brand, according to WSU research.
More Behavior News and Behavior Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Climate Mindset
In the past few months, human beings have come together to fight a global threat. This hour, TED speakers explore how our response can be the catalyst to fight another global crisis: climate change. Guests include political strategist Tom Rivett-Carnac, diplomat Christiana Figueres, climate justice activist Xiye Bastida, and writer, illustrator, and artist Oliver Jeffers.
Now Playing: Science for the People

#562 Superbug to Bedside
By now we're all good and scared about antibiotic resistance, one of the many things coming to get us all. But there's good news, sort of. News antibiotics are coming out! How do they get tested? What does that kind of a trial look like and how does it happen? Host Bethany Brookeshire talks with Matt McCarthy, author of "Superbugs: The Race to Stop an Epidemic", about the ins and outs of testing a new antibiotic in the hospital.
Now Playing: Radiolab

Speedy Beet
There are few musical moments more well-worn than the first four notes of Beethoven's Fifth Symphony. But in this short, we find out that Beethoven might have made a last-ditch effort to keep his music from ever feeling familiar, to keep pushing his listeners to a kind of psychological limit. Big thanks to our Brooklyn Philharmonic musicians: Deborah Buck and Suzy Perelman on violin, Arash Amini on cello, and Ah Ling Neu on viola. And check out The First Four Notes, Matthew Guerrieri's book on Beethoven's Fifth. Support Radiolab today at Radiolab.org/donate.