Scientists in Japan are developing methods to manufacture safer ceramic capacitors.
A team of scientists from Hokkaido University and the multinational electronics company TDK Corporation in Japan has developed a method to improve the insulating properties of the oxynitride perovskite SrTaO2N for potential use as a ceramic capacitor.
Ceramic capacitors are used in a wide variety of electronics, ranging from computers and mobile phones to telecommunications transmitter stations and high voltage laser power supplies. Capacitors act, in a way, like batteries.
They are “dielectric” – they act as an electronic insulator in which an electric field can be sustained with minimum loss of power. Their dielectric properties allow them to store electricity and then release it. One of the most widely used ceramics in capacitors is lead zirconate titanate, but it is hazardous to the health and the environment once it’s disposed. Scientists are trying to find other less hazardous ceramic materials for use in capacitors.
Perovskite oxynitrides – cheap and easily fabricated materials with a distinctive crystalline structure – are particularly promising. But ceramics manufactured from these materials need to be made denser to improve their insulating properties.
This is usually done by applying intense heat; a process called “sintering”. However, sintering the material can lead to a change in its chemical composition, turning it from an insulator to an electrical conductor.
The researchers sintered the perovskite powder SrTaO2N at a temperature of 1723 Kelvin (1450° Celsius) for three hours. They then “annealed” the material by heating it with flowing ammonia at 1223 Kelvin (950° Celsius) for 12 hours and then allowing it to slowly cool.
They found that the surface of the material after this process (but not its interior) displayed an important dielectric property called “ferroelectricity”. This was the first time that a ferroelectric response has been observed on oxynitride perovskite ceramics, they say, making it promising as a new dielectric material for multi-layered ceramic capacitors.
The study was published in the journal Chemistry of Materials.
For further information contact:
Name: Professor Shinichi KIKKAWA and Associate Professor Yuji MASUBUCHI
Department: Faculty of Engineering
Institution: Hokkaido University
Email: email@example.com and firstname.lastname@example.org
Hokkaido University | Research SEA
A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes
20.07.2018 | Science China Press
Future electronic components to be printed like newspapers
20.07.2018 | Purdue University
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences