Kinetics and thermodynamics of B-site cation order in (Sr,Ba)2FeSbO6 perovskite

No Thumbnail Available
Access rights
openAccess
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-02-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
4
11-14
Series
Journal of Solid State Chemistry, Volume 258
Abstract
Several sample series of the (Sr0.5Ba0.5)2FeSbO6 double-perovskite compound are synthesized under various heat-treatment conditions starting from a sol-gel prepared precursor to investigate the kinetics and thermodynamics of the B-site cation ordering. The synthesis yields samples with different levels of Fe/Sb ordering ranging from essentially disordered up to fully ordered depending on the synthesis temperature and duration. In the temperature range 1050–1200 °C the degree of order is kinetically controlled following Johnson-Mehl-Avrami-Kolmogorov type kinetics, while at 1300 °C the thermodynamic equilibrium is quickly reached such that higher than 95% ordering degrees are obtained in heat-treatment periods as short as couple of hours. Also importantly, for the differently synthesized single-phase samples a linear relationship between the degree of order and the cubic sub-cell dimension is seen.
Description
Keywords
Cation ordering, Crystal structure, Double perovskite
Other note
Citation
Tiittanen, T & Karppinen, M 2018, ' Kinetics and thermodynamics of B-site cation order in (Sr,Ba) 2 FeSbO 6 perovskite ', Journal of Solid State Chemistry, vol. 258, pp. 11-14 . https://doi.org/10.1016/j.jssc.2017.09.032