Sökning: WFRF:(Esmaeilzadeh H)
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Structure and magne...
Structure and magnetic susceptibility of MnNb3O6
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- Hannerz, H (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Svensson, Gunnar, 1960- (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Esmaeilzadeh, Saeid (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Grins, Jekab (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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(creator_code:org_t)
- 1999
- 1999
- Engelska.
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Ingår i: Solid State Sciences. - 1293-2558 .- 1873-3085. ; 1, s. 567-575
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The mixed valence state niobium compound MnNb3O6 was found while studying phase formations in the system MnO-Nb2O5-NbO. It is isostructural with AxNb3O6, x ≤ 1 and A = Na, Ca. Single crystals were obtained by heating MnC2O4 · 2H2O and Nb2O5 in a flow of H2 at 1300 °C. Monophasic samples were also prepared by heating stoichiometric mixtures of MnO, Nb2O5 and Nb in niobium ampoules under Ar(g) at 1100 °C. The crystal structure of MnNb3O6 (Immm, Z = 4, a = 7.1057(5), b = 10.1420(6), c = 6.5341(5) Å) was refined, using singlecrystal MoKα X-ray diffraction data, to a weighted R value of 0.018 for 329 unique reflections. The structure contains undulating layers of NbO6 octahedra of the type α2[NbO6/2]in the ac-plane, with the octahedra sharing edges along [001]and corners along [100]. Between the layers there are columns along [001]of edge-sharing square MnO8 prisms alternating with columns containing Nb2O8 clusters with an Nb-Nb distance of 2.6163(5) Å. The magnetic susceptibility shows a Curie-Weiss behaviour: χM = C/(T+θ) with θ ≈ −22 K and μeff = 6.0(1) μB for T ≥ ca. 35 K, with a small deviation from this dependence at lower temperatures, indicating Mn2+ ions with localised magnetic moments and antiferromagnetic interactions.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Solid state chemistry
- Fasta tillståndets kemi
- Inorganic Chemistry
- oorganisk kemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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