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Journal Article

Synthesis, crystal structure and magnetic properties of β-Na3FeO3

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Sofin,  M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen,  M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Sofin, M., & Jansen, M. (2006). Synthesis, crystal structure and magnetic properties of β-Na3FeO3. Solid State Sciences, 8(1), 19-23.


Cite as: https://hdl.handle.net/21.11116/0000-000F-027B-5
Abstract
beta-Na3FeO3 was prepared via the azide/nitrate route. Stoichiometric
mixtures of the precursors (Fe2O3, NaN3 and NaNO3) were heated in a
special regime up to 450 degrees C and annealed at this temperature for
50 h in specially designed silver containers. Single crystals have been
grown by subsequent annealing of the reaction product at 500 degrees C
for 1000 h, in silver crucibles which were sealed in glass ampoules
under dried Ar. According to the X-ray analysis of the crystal
structure (Ia, Z = 8, a = 6.1408(4), b = 10.6944(7), c = 11.7920(8)
angstrom, beta = 90.653(3)degrees, 1667 independent reflections, R-1 =
3.37% (F-o > 4 sigma(F-o)) chains of corner-sharing FeO4 tetrahedra are
the main structural feature. With this respect, there is full
correspondence to the structure of former alpha-Na3FeO3. The most
prominent difference between the alpha- and beta-form can be noted in
the periodicity and the mutual arrangement of the (infinityFeO3)-Fe-1
polyanions. The magnetic susceptibility provides evidence for a strong
antiferromagnetic exchange between Fe+3 ions. The best fit of the
susceptibility data yields an average value of the coupling strength
between magnetic centres within the FeO3 chains of J/k(B) = -62 K (-43
cm(-1)). (c) 2005 Elsevier SAS. All rights reserved.