Synthesis and characterization of the crystal structure and magnetic properties of the ternary manganese vanadate NaMnVO4.

Hamdi Ben Yahia (1) , Etienne Gaudin (1) , Khalid Boulahya (2) , Jacques Darriet (1) , Won-Joon Son (3) , Myung-Hwan Whangbo (3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Departamento de Quimica Inorgnica
3 Department of Chemistry, North Carolina Raleigh

A new ternary manganese vanadate, NaMnVO(4), was synthesized by solid state reaction route, and its crystal structure and magnetic properties were characterized by X-ray diffraction, magnetic susceptibility and specific heat measurements, and by density functional calculations. NaMnVO(4) crystallizes in the maricite-type structure with space group Pnma, a = 9.563(1) A, b = 6.882(1) A, c = 5.316(1) A, and Z = 4. NaMnVO(4) contains MnO(4) chains made up of edge-sharing MnO(6) octahedra, and these chains are interlinked by VO(4) tetrahedra. The magnetic susceptibility has a broad maximum at T(max) = 24 K and follows the Curie-Weiss behavior above 70 K with θ = -62 K. NaMnVO(4) undergoes a three-dimensional antiferromagnetic ordering at T(N) = 11.8 K. The spin exchanges of NaMnVO(4) are dominated by the intrachain antiferromagnetic exchange, and the interchain spin exchanges are spin-frustrated. The most probable magnetic structure of the ordered magnetic state below T(N) was predicted on the basis of the extracted spin exchanges.

Domaines: Matériaux

Hamdi Ben Yahia, Etienne Gaudin, Khalid Boulahya, Jacques Darriet, Won-Joon Son, et al.. Synthesis and characterization of the crystal structure and magnetic properties of the ternary manganese vanadate NaMnVO4.. Inorganic Chemistry, 2010, 49 (18), pp.8578-8582. ⟨10.1021/ic101180h⟩. ⟨hal-00530074⟩