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Synthesis, Crystal Structure, and Magnetic Properties of FeP3SiO11: First Example of Iron(III)Silicophosphate

✍ Scribed by L.K. Elbouaanani; B. Malaman; R. Gérardin

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
360 KB
Volume
147
Category
Article
ISSN
0022-4596

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✦ Synopsis

FeP 3 SiO 11 has been prepared by solid state reaction of Fe(PO 3 ) 3 and SiO 2 at 9003C under vacuum. This compound is isotypic with RuP 3 SiO 11 and the atomic coordinates have been re5ned by the Rietveld method. The unit cell is trigonal, space group R-3c, with a ‫؍‬ 8.2896(9) A > , c ‫؍‬ 39.054(4) A > , and Z ‫؍‬ 12. The structure is characterized by isolated FeO 6 octahedra connected by bent P 2 O 7 groups (1263) while Si 2 O 7 units only share corners with P 2 O 7 units. Neutron di4raction study shows that FeP 3 SiO 11 is antiferromagnetic with a NeH el temperature T N ‫؍‬ 3.5 K. In this compound, the magnetic interactions arise only from Fe}O}P}O}Fe superexchange mechanism. The magnetic structure is characterized by a stacking of antiferromagnetic (001) layers of double FeO 6 octahedra sheets, with the spin perpendicular to the c-axis. The room temperature MoK ssbauer spectrum is characteristic of the Fe 3؉ valence state. The magnetic interactions are discussed.

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