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Site-selective substitution and resulting magnetism in arc-melted perovskite ATiO3-δ (A = Ca,Sr, Ba) |
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| Authors: | Songhak Yoon Wenjie Xie Xingxing Xiao Stefano Checchia Mauro Coduri Peter Schuetzenduebe Marc Widenmeyer Stefan G Ebbinghaus Benjamin Balke Anke Weidenkaff Gisela Schütz Kwanghyo Son |
| Affiliation: | 1. Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS, Hanau, Germany;2. Department of Materials and Earth Sciences Materials, and Resources, Technical University of Darmstadt, Darmstadt, Germany;3. European Synchrotron Radiation Facility, Grenoble, France;4. European Synchrotron Radiation Facility, Grenoble, France
Department of Chemistry, University of Pavia, Pavia, Italy;5. Department of Modern Magnetic Systems, Max Planck Institute for Intelligent Systems, Stuttgart, Germany;6. Institute of Chemistry, Martin Luther University, Halle-Wittenberg, Halle, Germany;7. Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS, Hanau, Germany Department of Materials and Earth Sciences Materials, and Resources, Technical University of Darmstadt, Darmstadt, Germany |
| Abstract: | Magnetic properties in perovskite titanates ATiO3-δ (A = Ca, Sr, Ba) were investigated before and after arc melting. Crystal structure analysis was conducted by powder synchrotron X-ray diffraction with Rietveld refinements. Quantitative chemical element analysis was carried out by X-ray photoelectron spectroscopy. Magnetic measurements were conducted by vibrating sample magnetometer and X-ray magnetic circular dichroism (XMCD). The magnetic properties are found to be affected by impurities of 3d elements such as Fe, Co, and Ni. Depending on the composition and crystal structure, the occupation of the magnetic ions in perovskite titanates is selectively varied, which is interpreted to be the origin of the different magnetic behaviors in arc-melted perovskite titanates ATiO3-δ (A = Ca, Sr, Ba). In addition, both formation of oxygen vacancies and the reduction of Ti4+ to Ti3+ during arc-melting also play a role as proven by XMCD. Nevertheless, preferential site occupation of magnetic impurities is dominant in the magnetic properties of arc-melted perovskite ATiO3-δ (A = Ca, Sr, Ba). |
| Keywords: | arc-melting magnetism perovskite oxide synchrotron X-ray diffraction X-ray magnetic circular dichroism |
