Hostname: page-component-78c5997874-ndw9j Total loading time: 0 Render date: 2024-11-14T15:18:04.176Z Has data issue: false hasContentIssue false

Synthesis and crystal structure of double-perovskite compound Sr2FeMoO6

Published online by Cambridge University Press:  06 March 2012

Y. C. Hu
Affiliation:
Nanjing National Laboratory of Microstructures, Key Lab of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
J. J. Ge
Affiliation:
Nanjing National Laboratory of Microstructures, Key Lab of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
Q. Ji
Affiliation:
Nanjing National Laboratory of Microstructures, Key Lab of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
B. Lv
Affiliation:
Nanjing National Laboratory of Microstructures, Key Lab of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
X. S. Wu*
Affiliation:
Nanjing National Laboratory of Microstructures, Key Lab of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
G. F. Cheng
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]

Abstract

Samples of single-phase Sr2FeMoO6 were successfully prepared by solid-state reaction with long sintering times. The crystal structures of the Sr2FeMoO6 samples were determined from X-ray powder diffraction data using the Rietveld refinement method. The structure results obtained by the Rietveld refinements show that an increase in the total sintering time of the solid-state reaction is an effective method to obtain single Sr2FeMoO6 phase and to improve the ordering of Fe and Mo cations (or reducing antisite defects) in the double-perovskite structure. The volume of the tetragonal unit cell of Sr2FeMoO6 contracts slightly after successive sintering treatments. The averaged Fe-O and Mo-O bond lengths as well as the tilt between the FeO6 and the MoO6 octahedra decrease with increasing total sintering time. Our results suggest that the detected subtle changes in crystal structure, such as bond lengths and bond angles between the Fe and Mo cations and oxygen, in the ordered double-perovskite structure may be responsible for the large effects on previously reported transport and magnetic properties of an oxide metal.

Type
Technical Articles
Copyright
Copyright © Cambridge University Press 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Hu, Y. C., Wang, P. F., Lv, B., Ji, Q., Wu, X. S., and Lu, Q. F. (2009). “Positron annihilation spectroscopy and transport properties of double perovskite compound Sr2−xGdxFeMoO6,” J. Appl. Phys.JAPIAU 105, 07D72607D726-3.10.1063/1.3075861CrossRefGoogle Scholar
Jurca, B., Berthon, J., Dragoe, N., and Berthet, P. (2009). “Influence of successive sintering treatments on high ordered Sr2FeMoO6 double perovskite properties,” J. Alloys Compd.JALCEU 474, 416423.10.1016/j.jallcom.2008.06.100CrossRefGoogle Scholar
Kobayashi, K. -I., Kimura, T., Sawada, H., Terakura, K., and Tokura, Y. (1998). “Room-temperature magnetoresistance in an oxide material with an ordered double-perovskite structure,” Nature (London)NATUAS 395, 677680.10.1038/26427CrossRefGoogle Scholar
Lindén, J., Shimada, T., Motohashi, T., Yamauchi, H., and Karppinen, M. (2004). “Iron and molybdenum valence in double-perovskite (Sr, Nd)2FeMoO6: Electron-doping effects,” Solid State Commun.SSCOA4 129, 129133.10.1016/j.ssc.2003.09.025CrossRefGoogle Scholar
Navarro, J., Frontera, C., Balcells, L. L., Martínez, B., and Fontcuberta, J. (2001). “Raising the Curie temperature in Sr2FeMoO6 double perovskites by electron doping,” Phys. Rev. BPLRBAQ 64, 092411-092411–4.10.1103/PhysRevB.64.092411CrossRefGoogle Scholar
Prinz, G. A. (1999). “Magnetoelectronics applications,” J. Magn. Magn. Mater.JMMMDC 200, 5768.10.1016/S0304-8853(99)00335-2CrossRefGoogle Scholar
Stoeffler, D. and Silviu, C. (2006). “Ab initio study of the electronic structure of Sr2FeMoO6 double perovskites presenting oxygen vacancies or/and antisite imperfections,” Mater. Sci. Eng., BMSBTEK 126, 133138.10.1016/j.mseb.2005.09.036CrossRefGoogle Scholar
Toby, B. H. (2001). “EXPGUI, a graphical user interface for GSAS,” J. Appl. Crystallogr.JACGAR 34, 210213.10.1107/S0021889801002242CrossRefGoogle Scholar
Wu, X. S., Jiang, S. S., Lin, J., Liu, J. S., Chen, W. M., and Jin, X. (1998). “Microstructural variations of YBa2Cu3Oy doped with Ca at high doping level,” Physica CPHYCE6 309, 2532.10.1016/S0921-4534(98)00568-1CrossRefGoogle Scholar
Wu, X. S., Jiang, S. S., Xu, N., Pan, F. M., Huang, X. R., Ji, W., Mao, Z. Q., Xu, G. J., and Zhang, Y. H. (1996). “Structure of La1.85Sr0.15CuO4 doped with Zn in high doping level,” Physica CPHYCE6 266, 296302.10.1016/0921-4534(96)00336-XCrossRefGoogle Scholar