Google Play icon

Advanced electron microscopy reveals atomic-scale structure

Posted March 8, 2013
HAADF STEM image of c-BN doped with Ce atoms  © Ryo Ishikawa

HAADF STEM image of c-BN doped with Ce atoms © Ryo Ishikawa

Cubic boron nitride is a promising system for photonics and optoelectronics. Determining the inclusion mechanisms for dopants with a large size mismatch, such as luminous rare-earth elements, is prerequisite to understanding their functional properties and to effective doping control.

In this study, Professor Yuichi Ikuhara, Associate Professor Naoya Shibata and their group at the University of Tokyo’s Graduate School of Engineering Institute of Engineering Innovation directly imaged individual Ce single dopant atoms inside a c-BN host crystal using an atomic-resolution scanning transmission electron microscope equipped with an aberration corrector.

It was found that Ce single atoms occupy the N sites but not B sites. Combining the experimental findings with first-principles calculations, the researchers discovered that the Ce atoms are forming a complex point-defect structure inside c-BN. This surprising result is the fundamental reason that very large Ce atoms can be accommodated inside c-BN crystals.

Paper: “Functional Complex Point-Defect Structure in a Huge-Size-Mismatch System”, Phys. Rev. Lett. 110, 065504 (2013). DOI: 10.1103/PhysRevLett.110.065504. Article link

Source: University of Tokyo

Featured news from related categories:

Technology Org App
Google Play icon
87,514 science & technology articles

Most Popular Articles

  1. An 18 carat gold nugget made of plastic (January 13, 2020)
  2. Anti Solar Cells: A Photovoltaic Cell That Works at Night (February 3, 2020)
  3. Toyota Raize is a new cool compact SUV that we will not see in this part of the world (November 24, 2019)
  4. Nuclear waste could be recycled for diamond battery power (January 21, 2020)
  5. Physicist Proposes a Testable Theory Stating that Information has Mass and could Account for Universe s Dark Matter (January 24, 2020)

Follow us

Facebook   Twitter   Pinterest   Tumblr   RSS   Newsletter via Email