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Phase formation, crystal structures and magnetic properties of perovskite-type phases in the system La2Co1+z(MgxTi1-x)1-zO6
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Version:1.0 StartHTML:0000000262 EndHTML:0000006541 StartFragment:0000003092 EndFragment:0000006505 SourceURL:file://localhost/Users/gunnarsvensson/Dropbox/Manuscript_La2CoMO6/Final%2020100912/JSSC/Revised%20manuscript/Manuscript_GSvensson_JSSC_101103.doc Perovskite-type cobaltates in the system La2Co1+z(MgxTi1-x)1-zO6 were studied for z = 0 ≤ x ≤ 0.6 and 0 ≤ x < 0.9, using X-ray and neutron powder diffraction, electron diffraction (ED), magnetic susceptibility measurements and X-ray absorption near-edge structure (XANES) spectroscopy. The samples were synthesised using the citrate route in air at 1350°C. The space group symmetry of the structure changes from P21/n via Pbnm to with both increasing Mg content and increasing Co content. The La2Co(MgxTi1-x)O6 (z = 0) compounds show anti-ferromagnetic couplings of the magnetic moments for the Co below 15K for x = 0, 0.1 and 0.2. XANES spectra show for the compositions 0 ≤ x ≤ 0.5 a linear decrease in the L3/(L3+L2) Co-L2,3 edge branching ratio with x, in agreement with a decrease of the average Co ion spin state, from a high-spin to a lower-spin state, with decreasing nominal Co2+ ion content.
Uppsala University
Istomin S Y , Moscow State University, Department of Chemistry
Karvonen L , cLaboratory of Inorganic Chemistry, Aalto University School of Science and Technology, FI – 00076, Aalto, Finland
Chen S A , National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC
Chen T H , National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC
Chen J M , National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC
Weidenkaff A , Laboratory for Solid State Chemistry and Catalysis, EMPA-Swiss Federal Laboratories for Materials Science and Technology, CH – 8600, Dübendorf, Switzerland
Karppinen M. , Laboratory of Inorganic Chemistry, Aalto University School of Science and Technology, FI – 00076, Aalto, Finland
Sirtl T , Department of Physics, Freie Universitet, 14195, Berlin, Germany
Title: Phase formation, crystal structures and magnetic properties of perovskite-type phases in the system La2Co1+z(MgxTi1-x)1-zO6
Description:
Version:1.
0 StartHTML:0000000262 EndHTML:0000006541 StartFragment:0000003092 EndFragment:0000006505 SourceURL:file://localhost/Users/gunnarsvensson/Dropbox/Manuscript_La2CoMO6/Final%2020100912/JSSC/Revised%20manuscript/Manuscript_GSvensson_JSSC_101103.
doc Perovskite-type cobaltates in the system La2Co1+z(MgxTi1-x)1-zO6 were studied for z = 0 ≤ x ≤ 0.
6 and 0 ≤ x < 0.
9, using X-ray and neutron powder diffraction, electron diffraction (ED), magnetic susceptibility measurements and X-ray absorption near-edge structure (XANES) spectroscopy.
The samples were synthesised using the citrate route in air at 1350°C.
The space group symmetry of the structure changes from P21/n via Pbnm to with both increasing Mg content and increasing Co content.
The La2Co(MgxTi1-x)O6 (z = 0) compounds show anti-ferromagnetic couplings of the magnetic moments for the Co below 15K for x = 0, 0.
1 and 0.
2.
XANES spectra show for the compositions 0 ≤ x ≤ 0.
5 a linear decrease in the L3/(L3+L2) Co-L2,3 edge branching ratio with x, in agreement with a decrease of the average Co ion spin state, from a high-spin to a lower-spin state, with decreasing nominal Co2+ ion content.
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