Synthesis and study of the crystallographic and magnetic structure of DyFeMnO5: A new ferrimagnetic oxide

✍ Scribed by M.J. Martínez-Lope; M. Retuerto; J.A. Alonso; V. Pomjakushin

• Book ID: 104030167
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 987 KB
• Volume: 181
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2008.05.009

✦ Synopsis

The title oxide has been obtained by replacing Mn 3+ by Fe 3+ in the parent oxide DyMn 2 O 5 . The crystallographic and magnetic structures have been analysed from neutron powder diffraction (NPD) data, in complement with susceptibility and magnetic measurements. DyFeMnO 5 is orthorhombic, belonging to the Pbam space group as the parent compound. The crystal structure contains infinite chains of edge-sharing Mn 4+ O 6 octahedra, interconnected by dimer units of Fe 3+ O 5 square pyramids. There is a certain antisite disorder in the crystal structure, with 8.0% of the Mn 4+ sites occupied by Fe cations, and 8.2% of the Fe 3+ positions occupied by Mn 3+ cations. The magnetization measurements show that DyFeMnO 5 presents magnetic order below T C E178 K; a study of the magnetic structure from the low-temperature NPD patterns indicates an antiferromagnetic coupling of the Mn 4+ and Fe 3+ spins, with the polarization of the Dy 3+ magnetic moments parallel to the those of the Fe sublattice.