Adler Peter, Schröder Liane, Teske Klaus, Reehuis Manfred, Hoser Andreas, Merz Patrick, Schnelle Walter, Felser Claudia, Jansen Martin
Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany.
Helmholtz-Zentrum für Materialien und Energie, 14109 Berlin, Germany.
Phys Chem Chem Phys. 2022 Jul 21;24(28):17028-17041. doi: 10.1039/d2cp02156k.
The oxygen-deficient system SrFeO was explored by heating the stoichiometric Fe oxide SrFeO in well-defined oxygen partial pressures which were controlled electrochemically by solid-state electrolyte coulometry. Samples with up to about 0.2 were obtained by this route. X-ray diffraction analysis reveals that the KNiF-type crystal structure (space group 4/) of the parent compound is retained. The lattice parameter slightly decreases while the -parameter increases with increasing , which is in contrast to the Ruddlesden-Popper system SrFeO and suggests removal of oxygen atoms from FeO lattice planes. The magnetic properties were studied by magnetization, Fe Mössbauer, and powder neutron diffraction experiments. The results suggest that extraction of oxygen atoms from the lattice progressively changes the elliptical spiral spin ordering of the parent compound to an inhomogeneous magnetic state with coexistence of long-range ordered regions adopting a circular spin spiral and smaller magnetic clusters.
