Regensburg 2019 – scientific programme
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SYCO: Symposium Mechanically Controlled Electrical Conductivity of Oxides
SYCO 1: Mechanically controlled electrical conductivity of oxides
SYCO 1.1: Invited Talk
Monday, April 1, 2019, 09:30–10:00, H1
Dislocation Dynamics and Their Conductivities in Oxides — •Yuichi Ikuhara — Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8656, Japan — Nanostructures Res. Lab., Japan Fine Ceramics Center, Nagoya, 456-8587, Japan — WPI-AIMR Research Center, Tohoku University, Sendai, 980-8577, Japan
Dislocations can be used as conductive nanowires in crystals [1]. In this study, insulating sapphire and YSZ (Y2O3−ZrO2) single crystal are used as model systems in which high-density of dislocations and periodically aligned dislocations were introduced by high-temperature compression tests and fabrication of bicrystals with low-angle grain boundaries. The electron and ion conductivities were measured for the dislocation introduced crystals, and it was concluded that the techniques are very useful for providing new functions such as electron and ion conductivities. We call these techniques as *Dislocation Technology*. It is also interesting to directly observe the dislocation motion. In this study, the nanoindentation experiments were conducted for SrTiO3 bicrystals inside TEM (Transmission Electron Microscope). The bicrystals including various types of GBs were prepared for the experiments. The samples were indented with the sharp diamond tip and successfully observed the dislocation dynamics [2]. It was found that the interaction between the introduced lattice dislocations and the GBs were dependent on the GB characters.
[1] Y.Ikuhara, Prog. Mater. Sci., 54, 770 (2009)
[2] S. Kondo, T. Mitsuma, N. Shibata, Y. Ikuhara, Sci. Adv., 2(11), 1501926 (2016).