Control of Copper and Iron Oxidation States in Some Triple- and Double-Perovskite Oxides;Doctoral thesis

摘要

This thesis consists of eight publications and a summary of the obtained experimental results, reviewed together with the most essential literature related to the topic. The work deals with ways of tuning and analyzing the translation metal oxidation metal oxidation states in the superconductive Cu (Ba, Sr) 2(Yb, Ca) Cu2O6+z triple perovskite and the BaRE (Fe, Cu) O5+o double perovskite, which has aroused interest as a structure potentially exhibiting both superconductivity and magnetoresistivity. These trip- and double-perovskite oxides are compared with regard to their charge distribution at different cation and oxygen stoichiometries. Complementary methods of analysis, including both chemical and physical techniques, are utilized for the determination of the charge distribution in these layered oxide structures with several transition metal ions. Multivariate data analysis is introduced as a novel way for examining the structure-property correlations of complex oxide structures based on the crystallographic data obtained by neutron diffraction.