Abstract
The new ternary vanadate Na 3MnV 2O 7.5 has been synthesized by solid state reaction route. Its crystal structure was determined from both powder X-ray diffraction data and high-resolution transmission electron microscopy (HRTEM) analysis. Na 3MnV 2O 7.5 ( P2 /c, a = 7.4004(4) Å, b = 5.6065(3) Å, c = 17.0876(11) Å, β = 90.0114(2) °, and Z = 4) crystallizes with a new type of oxygen-deficient perovskite ABO 3-δ ( δ = 1/2) with the sodium atoms occupying the A site and the vanadium and manganese atoms perfectly ordered in the B site. In Na 3MnV 2O 7.5 the manganese and the vanadium atoms are octahedral and tetrahedral coordinated, respectively. The MnO 6 and VO 4 polyhedra share edges and form a perovskite 3D-framework with high disorder of the oxygen atoms. HRTEM confirmed this structural model. Na 3MnV 2O 7.5 was characterized by magnetic susceptibility and specific heat measurements. It is antiferromagnetic with no magnetic ordering down to 2 K.
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