Designing Structures and Functions of Transition-Metal Oxides - Explore the Old and Create the New -
* SPEAKERS
Name
Affiliation
E-mail
Prof. Hiroshi Kageyama
Kyoto University, Japan
sec(at)apctp.org
* HOST(Applicant)
Name
Affiliation
E-mail
-
* DATE / TIME
2009-04-07, 9:30~11:00 AM
* PLACE
APCTP headquarters, Pohang
* ABSTRACT
Transition-metal oxides have long served as the most important class of compounds contributing to the development of both from basic and applied sciences. Such materials, either in powder or single-crystalline form, are easily and readily prepared by traditional high-temperature reactions. However this method limits the control of structures to only those usually obtainable within the bounds of known structural types like spinels, and perovskites, known as thermodynamically stable phases. Reactions at low temperatures may erase this boundary, opening a door to obtain unprecedented structures and coordination geometries that can potentially lead to novel properties/functions. In particular, topotactic reactions provide a \"rational\" way of manipulating the structure and valence of receptive host compounds. I will demonstrate recent efforts to make novel magnetic and electric phases: the examples include ion-exchange reactions to allow internal \"epitaxial\" growth of magnetic layer within layered perovskite hosts, and reducing reactions to allow dimensional reduction of magnetic networks. Future directions and challenges of this strategy will be also discussed.
