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Phase formation, cr...
Phase formation, crystal structures and magnetic properties of perovskite-type phases in the system La2Co1+z(MgxTi1-x)1-zO6
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- Shafeie, Samrand, 1984- (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Grins, Jekabs (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Istomin, S. Y. (author)
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Karvonen, L. (author)
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Chen, S. A. (author)
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Chen, T. H. (author)
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Chen, J. M. (author)
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Weidenkaff, A. (author)
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Karppinen, M. (author)
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Sirtl, T. (author)
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- Svensson, Gunnar, 1960- (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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(creator_code:org_t)
- Elsevier BV, 2011
- 2011
- English.
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In: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 184:1, s. 177-190
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Cobaltates
- perovskite
- X-ray diffraction
- neutron diffraction
- magnetic susceptibility
- electron diffraction
- XANES
- Solid state chemistry
- Fasta tillståndets kemi
- Inorganic Chemistry
- oorganisk kemi
- Materials Chemistry
- materialkemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Shafeie, Samrand ...
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Grins, Jekabs
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Istomin, S. Y.
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Karvonen, L.
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Chen, S. A.
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Chen, T. H.
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show more...
-
Chen, J. M.
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Weidenkaff, A.
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Karppinen, M.
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Sirtl, T.
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Svensson, Gunnar ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Inorganic Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
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Journal of Solid ...
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Stockholm University