2008

Magnetic propertiesD 9000 Hydrothermal Synthesis and Magnetic Properties of MMn2O5 (M: La, Pr, Nd, Tb,

Bi) and LaMn2O5+δ. — The title compounds are hydrothermally synthesized from aqueous solutions of KMnO4, KOH, MnCl2, and M2O3 (M: La, Nd, Bi), or Tb4O7, or Pr6O11 (autoclave, 240 °C, 3 d) and characterized by powder XRD, SEM, XPS, and magnetic measurements. The excess oxygen (δ = 0.01—0.17) of LaMn2O5+δ is influ-enced by the alkalinity used in the hydrothermal synthesis. The compounds crystallize in the orthorhombic space group Pbam. The MMn2O5 compounds exhibit a helicoidally magnetic structure below 40 K and show an antiferromagnetic transition. — (CHEN, Y.; YUAN, H.; TIAN, G.; ZHANG, G.; FENG*, S.; J. Solid State Chem. 180 (2007) 4, 1340-1346; State Key Lab. Inorg. Synth. Prep. Chem., Coll. Chem., Jilin Univ., Changchun 130023, Peop. Rep. China; Eng.) — W. Pewestorf

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