RT Journal Article
T1 Complex magnetic behaviour of Sr2CoNb1-xTixO6 (0 ≤ x ≤ 0.5) as a result of a flexible microstructure
A1 Azcondo, María Teresa
A1 Romero de Paz, Julio
A1 Boulahya, Khalid
A1 Ritter, Clemens
A1 García Alvarado, Flaviano
A1 Amador, Ulises
AB We report the rich magnetic behaviour of Sr2CoNb1−xTixO6 (0 ≤ x ≤ 0.5) oxides as a result of their complex microstructure. Although these oxides show an average simple-cubic perovskite structure, they present a flexible microstructure due to short-range ordering between Co/Ti and Nb cations in the perovskite B-sites. The microstructure consists of double-cubic perovskite domains grown in a simple-cubic perovskite matrix. The size and number of the double-cubic perovskite domains decrease as the Ti content increases. As a result of aliovalent substitution of Nb5+ by Ti4+ in the parent Sr2CoNbO6 mixedvalence Co3+/Co4+ oxides are obtained. A spin glass-like state has been observed at low temperatures for all the series, with freezing temperatures increasing with the Ti-content in the range 22 to 33 K. Furthermore, the x = 0.3 and x = 0.5 samples show non-interacting superparamagnetic particle-like dynamics associated with relatively high amounts of Co4+, with “blocking temperatures” of 13 and ∼16 K, respectively. The complex magnetic behaviour of the title oxides seems to be connected with the clustering of magnetic Co3+ and the distribution of Co4+ as a result of the microstructure.
PB Royal Society of Chemistry
SN 1477-9226
YR 2015
FD 2015
LK https://hdl.handle.net/20.500.14352/99885
UL https://hdl.handle.net/20.500.14352/99885
LA eng
NO Ministerio de Economía y Competitividad (España)
NO Comunidad de Madrid
DS Docta Complutense
RD 31 dic 2025