Phase formation, crystal structures and magnetic properties of perovskite-type phases in the system La2Co1+z(MgxTi1-x)1-zO6 [Elektronisk resurs]
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Shafeie, Samrand 1984- (författare)
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Grins, Jekabs (författare)
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Istomin, S. Y. (författare)
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Karvonen, L. (författare)
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Chen, S. A. (författare)
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Chen, T. H. (författare)
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Chen, J. M. (författare)
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Weidenkaff, A. (författare)
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Karppinen, M. (författare)
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Sirtl, T. (författare)
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Svensson, Gunnar 1960- (författare)
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Stockholms universitet Naturvetenskapliga fakulteten (utgivare)
- 2011
- Engelska.
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Ingår i: Journal of Solid State Chemistry. - 0022-4596. ; 184:1, 177-190
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Sammanfattning
Ämnesord
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- Perovskite-type cobaltates in the system La(2)Co(1+z) (Mg(x)Ti(1-x))(1-z)O(6) 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 degrees C. The space group symmetry of the structure changes from P2(1)/n via Pbnm to R (3) over barc with both increasing Mg content and increasing Co content. The La(2)Co(Mg(x)Ti(1-x))O(6) (z=0) compounds show anti-ferromagnetic couplings of the magnetic moments for the Co below 15 K for x=0, 0.1 and 0.2. XANES spectra show for the compositions 0 <= x <= 0.5 a linear decrease in the L(3)/(L(3)+ L(2))Co-L(2.3) 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 Co(2+) ion content.
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- Natural Sciences (hsv)
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- NATURAL SCIENCES (svep)
- Chemistry (svep)
- Inorganic chemistry (svep)
- Solid state chemistry (svep)
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- Inorganic Chemistry (su)
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Indexterm och SAB-rubrik
- Cobaltates
- perovskite
- X-ray diffraction
- neutron diffraction
- magnetic susceptibility
- electron diffraction
- XANES
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