Lecture Irina Zvereva
|07 april 2008||FWN-Building 5118.-152, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Prof. Irina Zvereva|
|Affiliation:||St. Petersburg State University, Faculty of Chemistry|
|Title:||Mechanism of formation of perovskite-type layered structures|
|Date:||Mon Apr 7, 2008|
|Telephone:||+31 50 363 4419|
The lecture will give a brief review of general aspects (structural and kinetic) of the process of formation of perovskite-type layered structures (Ruddlesden-Popper and Aurivillius phases). The materials under investigation are double-layer perovskite structures: aluminates Ln2SrAl2O7, ferrites Ln2SrFe2O7, manganites Ln2SrFeMnO7, and titanoniobates LnBi2TiNbO10). Special attention will be devoted to the ordered titanates LnNaTiO7 and the promising opportunities that they give for the synthesis of a number of new oxides.
As additional aspects of the problem of phase stability, information on ordering phenomena that create boundaries for the existence or absence of the layered type of structure will be considered. Phase diagrams in the pseudobinary system in which one can find Ln2SrM2O7 possessing the P2/RS type of intergrowth will be discussed in connection with structural transformations in the cationic coordination during the process of formation.
|Laatst gewijzigd:||22 oktober 2012 14:30|