Abstract
The phase Sr 2CoFeO 5+ y has been studied by Mössbauer spectroscopy, X-ray powder diffraction, and magnetic susceptibility techniques. Quenching in air from 1200°C produces a partially oxidized material which contains small nonequilibrium microdomains of the brownmillerite Sr 2CoFeO 5 with excess oxygen accommodated in the domain walls. Quenching in liquid nitrogen from 1200°C produces stoichiometric Sr 2CoFeO 5 with a random distribution of cobalt and iron on the tetrahedral and octahedral sites. Annealing under argon at 800°C causes preferential occupation of the tetrahedral sites by cobalt. Both the nitrogen-quenched and the annealed sample are antiferromagnetic at room temperature.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call