Acta Crystallographica Section C

Crystal Structure Communications

Volume 62, Part 7 (July 2006)

inorganic compounds

Acta Cryst. (2006). C62, i64-i66 [ doi:10.1107/S0108270106021329 ]

Préparation et étude structurale de NH₄Gd(PO₃)₄ et NH₄GdP₄O₁₂

E. Ben Zarkouna, A. Driss et M. Férid

Abstract: Ammonium gadolinium polyphosphate, NH₄Gd(PO₃)₄, (I), and ammonium gadolinium cyclotetraphosphate, NH₄GdP₄O₁₂, (II), were synthesized by flux growth with excess (NH₄)₂HPO₄. In (I), the PO₄ tetrahedra share vertices to produce corrugated ribbons along the c direction, while in (II) they form P₄O₁₂ rings arranged in layers perpendicular to the c axis. In both structures, isolated GdO₈ polyhedra link the phosphate anions into a three-dimensional framework with channels containing the NH₄⁺ cations. The Gd and N atoms are located in general positions in (I) and on twofold axes in (II).

Formula: NH₄GdP₄O₁₂ et NH₄Gd(PO₃)₄


	Structure factor file (CIF format) (96.9 kbytes) [ doi:10.1107/S0108270106021329/bc3007Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (50.5 kbytes) [ doi:10.1107/S0108270106021329/bc3007IIsup3.hkl ] Contains datablock II

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