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Synthesis and crystal structure of double-perovskite compound Sr2FeMoO6

Published online by Cambridge University Press:  06 March 2012

Y. C. Hu ,
J. J. Ge ,
Q. Ji ,
B. Lv ,
X. S. Wu  and
G. F. Cheng
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]
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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.

Keywords

X-ray diffractionsynthesis processcrystal structureSr2FeMoO6
Type
Technical Articles
Information
Powder Diffraction , Volume 25 , Supplement S1 , September 2010 , pp. S17 - S21
Copyright
Copyright © Cambridge University Press 2010

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