The Open Inorganic Chemistry Journal

2007, 1 : 37-46
Published online 2007 October 8. DOI: 10.2174/1874098700701010037
Publisher ID: TOICJ-1-37

Revisiting the Role of Vacancies in Manganese Related Perovskites

Luisa Ruiz-González , Raquel Cortés-Gil , |José M Alonso , José M. González-Calbet and María Vallet-Regí
Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense, 28040-Madrid, Spain.

ABSTRACT

Oxygen engineering is an important tool for on-demand tailoring of manganese related perovskites into optimized performances. Anionic vacancies can be induced in both doped and undoped manganites by means of topotactic reduction processes under oxygen controlled atmosphere. This has given rise to the stabilization of new phases as a consequence of ordering of oxygen vacancies in which Mn2+ appears due to the reducing process. Different reduction pathways are proposed for LaMnO3 and doped systems. FM interactions remain at the octahedral layers when vacancies are longrange ordered. The peculiar magnetic behaviour of new layered perovskite superstructures is discussed.

Keywords:

Manganese related perovskites, colossal magnetoresistance, oxygen non-stoichiometry, cationic vacancies, anionic vacancies..