首页|Synthesis and crystal structure of double-perovskite compound Sr_2FeMoO_6

Synthesis and crystal structure of double-perovskite compound Sr_2FeMoO_6

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  • Cambridge Univ Press
Samples of single-phase Sr_2FeMoO_6 were successfully prepared by solid-state reaction with long sintering times. The crystal structures of the Sr_2FeMoO_6 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 Sr_2FeMoO_6 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 Sr_2FeMoO_6 contracts slightly after successive sintering treatments. The averaged Fe-O and Mo-O bond lengths as well as the tilt between the FeO_6 and the MoO_6 octahedradecrease 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.

x-ray diffractionsynthesis processcrystal structureSr_2FeMoO_6

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

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Nanjing National Laboratory of Microstructures, Key Lab of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China

Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China

2010

10.1154/1.3478711

Powder diffraction

Powder diffraction

AHCI
ISSN：0885-7156
年,卷(期)：2010.25(3Suppl.)
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