Talk given by Dr. Seiichiro Ii Microstructure Design Group Structural Materials Unit Research Center for Strategic Materials National Institute for Materials Science Tsukuba, Japan Abstract: Transmission electron microscopy (TEM) and scanning TEM (STEM) with spectroscopic tools, such as energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), enables us to quantitatively clarify chemical and electronic structures on a nanometer scale. In addition to the spectroscopy, a quantitative image analysis from digital image obtained by high resolution TEM (HRTEM) has also been developing in last two decades. Based on those techniques, we are able to obtain the quantitative information for not only chemical and electronic data but also the atomic structure in the specific region. In this talk, the recent findings of the quantitative analysis by means of (S)TEM and HRTEM for the several grain boundary phenomena will be presented. Grain boundaries are one of the lattice imperfect region, spectroscopic change can be seen in the grain boundaries due to the lattice distortion. So far, we have directly measured the local magnetic moments by TEM and EELS [1, 2], and evaluated the effect of the grain boundary character defined by misorientation angle etc. on the local magnetic moment. And the application of the elastic strain analysis by image processing [3] to planer defects such as grain boundaries by image processing of atomic image are also shown. [1] S. Ii et al., Scripta Materialia, 68 (2013), 253. [2] K. Hirayama et al., Sci. Tech. Adv. Mater., 15 (2014), 1, 015005. [3] M. J. Hÿtch et al., Ultramicroscopy 74 (1998) 131-146.

This event is part of the eventgroup INT Talks

Homepage
https://www.int.kit.edu/events.php

Speaker
Dr. Seiichiro Ii

National Institute for Materials Science Tsukuba, Japan
http://www.nims.go.jp/group/msdg/sii/index.html

Organizer
Dr. Christian Kübel
Institute of Nanotechnology (INT)
Karlsruhe Institute of Technology (KIT)
Eggenstein-Leopoldshafen
Mail: christian kuebel ∂does-not-exist.kit edu

Targetgroup
Interested / Everyone