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- W2005709934 abstract "The oxynitride spinel Mn2(MnTa3)N6-δO2+δ, with 0 ≤ δ ≤ 1, has been synthesized at 1175 K by ammonolysis of a mixture of a Ta-containing xerogel and Mn(OAc)2 · 4H2O. The N content was determined by combustion analysis and thermogravimetric oxidation, yielding a composition confined between Mn2(MnTa3)N6O2 (δ = 0) and Mn2(MnTa3)N5O3 (δ = 1). The structure is cubic, with space group Fd3m and a = 8.8353(3) A. It was refined using the Rietveld technique and neutron powder diffraction data collected at room temperature and 15 K, to RF = 2.9 and 3.8%, respectively. The tetrahedral sites are occupied only by Mn atoms and the octahedral sites statistically by 25% Mn and 75% Ta atoms. The N and O atoms are randomly distributed over the anion sites. The magnetic susceptibility exhibits a maximum at 29 K and a Curie-Weiss behavior at higher temperatures with θa = -250(20) K and μeff = 5.7(2) Bohr magnetons per Mn atom. The neutron powder diffraction data collected at 15 K showed no evidence of magnetic ordering. A NaCl-type phase with a = 4.4382(2) A and tentative composition Mn0.8Ta0.2(O,N) was observed in preparations at 1175 K. A hexagonal Mn4Ta2(O,N)x phase with cell dimensions a = 5.3024(4) A, c = 14.493(2) A was obtained at 973 K." @default.
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- W2005709934 date "1995-06-01" @default.
- W2005709934 modified "2023-09-27" @default.
- W2005709934 title "Synthesis, Structure and Magnetic Susceptibility of the Oxynitride Spinel Mn2(MnTa3)N6-δO2+δ, 0 ≤ δ ≤ 1" @default.
- W2005709934 doi "https://doi.org/10.1006/jssc.1995.1245" @default.
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