RT Journal Article
T1 The role of defects in microwave and conventionally synthesized LaCoO3 perovskite
A1 Prado Gonjal, Jesús de la Paz
A1 Gutiérrez-Seijas, Julia
A1 Herrero Ansorregui, Irene
A1 Morán Miguélez, Emilio
A1 Terry, Ian
A1 Schmidt, Rainer
AB In this work we investigate the magnetic, dielectric and charge transport properties of LaCoO3 (LCO) synthesized by two different techniques: microwave assisted and conventionally heated ceramic synthesis. The rapid microwave synthesis conditions are far away from thermodynamic equilibrium and are found to lead to modified crystal defect properties as compared to conventional synthesis. The thermally induced magnetic spin state transition at Ts1 ≈ 80 K is exemplified by temperature (T)-dependent dielectric spectroscopy data, which reveal the appearance of an additional dielectric contribution that is correlated to the transition. Magnetisation, M vs T, and electrical resistivity, ρ vs T, curves show that the additional dielectric phase is strongly influenced by magnetic defects and may be associated with higher spin state clusters in a magnetic spin-state coexistence scenario. We suggest that defects such as oxygen vacancies act as magnetic nucleation centres across the spin state transition Ts1 for the formation of higher spin state clusters in LCO perovskites.
PB Elsevier
SN 0955-2219
YR 2016
FD 2016
LK https://hdl.handle.net/20.500.14352/92291
UL https://hdl.handle.net/20.500.14352/92291
LA eng
NO Prado-Gonjal, Jesús, et al. «The Role of Defects in Microwave and Conventionally Synthesized LaCoO3 Perovskite». Journal of the European Ceramic Society, vol. 36, n.o 5, abril de 2016, pp. 1197-206. https://doi.org/10.1016/j.jeurceramsoc.2015.12.014.
NO Comunidad de Madrid
DS Docta Complutense
RD 12 abr 2025