Materials Processing and Characterization Division

Materials Science of Non-Stoichiometric Compounds

Eiji AKIYAMA PHOTO
Prof. Toyohiko J. KONNO
Assoc.Prof. Takanori KIGUCHI
Assist. Prof. Yusuke SHIMADA
Assist. Prof. Takahisa SHIRAISHI

Understanding the role of non-stoichiometry in the stabilization of structures; Imaging nano-space of materials; Pursuit of their functinality.

We investigate the role of non-stoichiometry on the stabilization of the phase and physical properties in alloys and oxides. To that end, we employ state-of-art transmission electron microscopy techniques, and investigate both structural and functional materials through the imaging of nano-space inside. In particular, we carry out the imaging at the atomic level by using state-of-the-art electron microscopy techniques such as aberration-corrected microscopy, focal-series restoration (FSR), geometric phase analysis (GPA), and 3D tomography (TEMT). Based on the studies of crystallographic structures and microstructures with these methods, our research activities are ultimately targeted to understand the underlying nature, with which these complex structures are stabilized.

phase stability, transmission electron microscopy, non-stoichiometric compounds
Atomic resolution HRTEM image of PbTiO3 thin film elucidates the small displacement of oxygen atoms and the spontaneous polarizations.

Atomic resolution HRTEM image of PbTiO3 thin film elucidates the small displacement of oxygen atoms and the spontaneous polarizations.

Quantitative strain mapping of PbTiO3 ferroelectric thin films.

Quantitative strain mapping of PbTiO3 ferroelectric thin films.

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