Synthesis and structural study of new phosphates: AMg2Fe(PO4)3 (A = Sr or Ba) with the α-CrPO4 structure type

Ahmed Ould Saleck

doi:10.5802/crchim.442

Synthesis and structural study of new phosphates: AMg2Fe(PO4)3 (A = Sr or Ba) with the α-CrPO4 structure type

2026-01-01

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Claudine Follet-Houttemane

L

Lahcen El Ammari

DOI：10.5802/crchim.442

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Single crystals of new orthophosphates AMg2Fe(PO4)3 (A = Sr or Ba) have been synthesized by solid-state reaction. From single crystal X-ray diffraction data, their corresponding crystal structures were solved in the orthorhombic system, with the Imma space group and unit cell parameters a = 10.3998 (2) & Aring;, b = 13.2000 (2) & Aring;, c = 6.5364 (1) & Aring; for the strontium compound and a = 10.4996 (2) & Aring;, b = 13.2696 (1) & Aring;, c = 6.6330 (2) & Aring; for the barium compound. Both phosphates crystallize with the alpha-CrPO4 structure type. The crystal structure of both orthophosphates is composed of MgO6 octahedra, FeO6 octahedra, and PO4 tetrahedra. The sharing of vertices between those polyhedra leads to a three-dimensional network defining hexagonal tunnels that are occupied by Sr2+ or Ba2+ cations.

Keywords:

. Orthophosphate

Crystal structure

Solid-state reaction

X-ray diffraction

alpha-CrPO4

Single crystal

Synthesis and structural study of new phosphates: AMg2Fe(PO4)3 (A = Sr or Ba) with the α-CrPO4 structure type

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