Synthesis, Crystal Structure, and Magnetic Measurement of Two New Diselenites:M2(Se2O5)3withM= Fe(III), Cr(III) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 1996

Synthesis, Crystal Structure, and Magnetic Measurement of Two New Diselenites:M2(Se2O5)3withM= Fe(III), Cr(III)

Résumé

Two new diselenite compounds have been synthetized by solid state reaction and their structures have been determined: Fe-2(Se2O5)(3) (I) and Cr-2(Se2O5)(3) (II). Both compounds crystallize in the monoclinic system, with the same space group P2(1)/n and moreover the unit cell dimensions are similar: a 11.325(1) Angstrom, b = 11.038(1) Angstrom, and c = 11.563(2) Angstrom, beta = 102.56(1)degrees, P2(1)/n, Z = 4, and V = 1411.0(8) Angstrom(3) for (I); a = 10.904(1)) Angstrom, b = 11.369(2) Angstrom, and c = 11.673(2) Angstrom, beta = 95.11(2)degrees, P2(1)/n, Z = 4, and V = 1441.1(6) Angstrom(3) for (II). In both compounds, the structure is built up from isolated octahedra sharing all their oxygen atoms with Se2O52- groups, thus forming a three-dimensional network. Each diselenite group acts as tetramonodentate ligand. Iron octahedra are more distorted than chromium ones. Some differences appear in the thermal behavior studies of these compounds. The chromium compound presents only a one step process instead of two for the iron compound giving an intermediate phase Fe-2(SeO3)(3). Magnetic measurements reveal a weak antiferromagnetic coupling for both compounds with a transition to a long range magnetic ordering at low temperature T = 32 K for (I).

Dates et versions

hal-04250073 , version 1 (19-10-2023)

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Anne-Marie Lafront, Jacques Bonvoisin, Jean-Christian Trombe. Synthesis, Crystal Structure, and Magnetic Measurement of Two New Diselenites:M2(Se2O5)3withM= Fe(III), Cr(III). Journal of Solid State Chemistry, 1996, 122 (1), pp.130-138. ⟨10.1006/jssc.1996.0092⟩. ⟨hal-04250073⟩
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