Crystal and Magnetic Structures of Sr2Fe2O5 at Elevated Temperature

✍ Scribed by M. Schmidt; S.J. Campbell

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 355 KB
• Volume: 156
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8998

✦ Synopsis

The evolution of crystal and magnetic structures of Sr 2 Fe 2 O 5 with temperature was studied using neutron powder di4raction. The measurements were made in the temperature range from room temperature up to 1223.15 K and the patterns were analyzed using the Rietveld method. The oxide undergoes two phase transitions: (i) from the antiferromagnetic to the paramagnetic state and (ii) from the orthorhombic to the cubic structure. We discuss the changes of structural parameters with temperature and propose a new structural model for the cubic phase. The di4raction patterns were re5ned using Ibm2, Ibm2, and Fm3c symmetry groups in the antiferromagnetic, the paramagnetic and the cubic state, respectively, with Z ‫؍‬ 4.