Facile syntheses, crystal structures and magnetic properties of NdBaMnCoO5 and NdBaMnCoO6

Abstract: NdBaMnCoO5 has been synthesized using a mass-flow controlled reducing reaction, followed by low (800°C) temperature oxidation to produce NdBaMnCoO6. The structures and properties have been analyzed using powder neutron diffraction and magnetic susceptibility measurements. At room temperature both phases are tetragonal with unit cells a p × a p ×2a p (a p =perovskite subcell length) showing full order of the A-site cations and no order of either B-site cations or charge. Low temperature neutron diffraction shows a fully antiferromagnetic (G-type) structure for NdBaMnCoO5 (cell √2a p ×√2a p ×2a p) and an orthorhombic cell (2a p ×2a p ×2a p) for NdBaMnCoO6. [Copyright &y& Elsevier]