Crystallography at non-ambient conditions and physical properties of the synthesized double perovskites, Sr<sub>2</sub>(Co<sub>1−<i>x</i></sub>Fe<sub><i>x</i></sub>)TeO<sub>6</sub>
Asmaa Zaraq, B. Orayech, J. M. Igartua, Abdeslam El Bouari, Duncan H. Gregory, Thorsten M. Gesing
Abstract
. The temperature-dependent vibrational features of the octahedral sites were investigated by Raman spectroscopy, which furthermore complements the XRD results. A decrease in the phase-transition temperature with increasing iron content has been observed for these compounds. This fact is explained by the progressive diminishing of the distortion of the double-perovskite structure in this series. Using room-temperature Mössbauer spectroscopy, the presence of two iron sites is confirmed. The two different transition metal cations Co and Fe at the B sites allow exploring their effect on the optical band-gap.
Topics & Concepts
Raman spectroscopyMössbauer spectroscopyPerovskite (structure)CrystallographyMaterials scienceSolid-stateCrystal structureSpectroscopySolid solutionChemistryPhysical chemistryMetallurgyPhysicsQuantum mechanicsOpticsMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides