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Hydrothermal synthesis, structural and thermal characterizations of three open-framework gallium phosphites

Abstract : Three new gallium phosphites A[Ga(HPO3)2], where A = K (1), NH4 (2), Rb (3), have been synthesized by using mild hydrothermal conditions under autogeneous pressure. Their structures have been determined by single-crystal X-ray diffraction. These compounds crystallize in the hexagonal P63mc space group with a = 5.2567 (2) Å and c = 12.2582 (3) Å for 1, a = 5.2576 (2) Å and c = 12.9113 (4) Å for 2, a = 5.27020 (10) Å and c = 12.7619 (5) Å for 3, with Z = 2 in the three phases. The three compounds are isostructural and exhibit the same framework topology, consisting of a layered structure stacked along the c-axis with the A+ cations located in the interlayer spaces. The [Ga(HPO3)2]- sheets contain GaO6 octahedra interconnected by phosphite units through sharing vertices. Thermal analysis under air atmosphere shows a large range stability for alkali cations containing compounds with decomposition starting around 750 K leading to phosphate phases. Under nitrogen, a disproportionation of the phosphite into red phosphorus and phosphates is expected, accompanied by a release of H2. © 2017 Elsevier Inc.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01581237
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Submitted on : Monday, September 4, 2017 - 2:38:59 PM
Last modification on : Wednesday, March 25, 2020 - 9:20:44 AM

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F. Hamchaoui, V. Alonzo, I. Marlart, S. Auguste, C. Galven, et al.. Hydrothermal synthesis, structural and thermal characterizations of three open-framework gallium phosphites. Journal of Solid State Chemistry, Elsevier, 2017, 255, pp.8--12. ⟨10.1016/j.jssc.2017.07.030⟩. ⟨hal-01581237⟩

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