Two Non‐Isostructural Gadolinium Oxide Nitride Chalcogenides: Gd₃ONSe₂ and Gd₃ONTe₂

Abstract

Two new non-isostructural gadolinium(III) oxide nitride chalcogenides with the composition Gd 3 ONCh 2 bearing selenide (Gd 3 ONSe 2 ) and telluride (Gd 3 ONTe 2 ) could be synthesized by the reaction of gadolinium metal (Gd) with gadolinium sesquioxide (Gd 2 O 3 ), sodium azide (NaN 3 ), selenium (Se) or tellurium (Te), iodine (I 2 ) and sodium iodide (NaI) as flux in evacuated silica tubes for seven days at 850 to 950°C. Yellow lath-shaped single crystals of Gd 3 ONSe 2 crystallize isotypically to Tb 3 ONSe 2 in the monoclinic space group C2/m with the lattice parameters a = 1560.12(9), b = 395.24(2), c = 977.35(6) pm, β = 97.321(3)°(Z = 4). In contrast, orthorhombic Gd 3 ONTe 2 forms black rods, appears in the space group Pnma with the lattice parameters a = 1337.87(8), b = 408.47(2), c = 1216.78 (7) pm (Z = 4) and adopts the crystal structure of Nd 3 N 2 SeBr. Three crystallographically independent Gd 3+ cations can be found in both oxide

Förderung der Grundlagenforschung

“…Moreover, semiquantitative measurements with the help of energy‐ and wavelength‐dispersive methods (EDX and WDX) on an electron microscope (Camebax, Cameca, Paris) were used to check the molar ratios of the heavy atomic components for the Ln 3 NTe 3 representatives ( Ln :Te ≈ 3:3) to confirm the chosen composition of 3:1:3 and thus to exclude possible oxidic contaminants (e.g. Gd 3 ONTe 2 34 or Tb 3 ONTe 2 35).…”