Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Mossbauer Spectroscopic Study of La2-2xSr2xCu1-xFexO4-y(0≤x≤0.5) Solid-solution

  • Park, Jung-Chul (Department of Nano Materials Science and Engineering, Nano Applied Technology Research Center, Silla University) ;
  • Byeon, Song-Ho (College of Environment and Applied Chemistry, Institute of Natural Sciences, Kyung Hee University) ;
  • Kim, Don (Department of Chemistry, Pukyong National University) ;
  • Lee, Choong-Sub (Department of Physics, Pukyong National University)
  • Published : 2004.01.20
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Abstract

Tetragonal $K_2NiF_4$-type $La_{2-2x}Sr_{2x}Cu_{1-x}Fe_xO_{4-y}$ solid-solution have been synthesized by citrate based sol-gel method. The valence state of iron was determined by Mossbauer spectroscopy and subsequent iodometric titration clearly showed that the copper ions in this solid-solution are in the mixed valence state Cu(II/III). When x ${\geq}$ 0.3, Fe(III) is competing with the mixture of Cu(II) and Cu(III) and $La_{2-2x}Sr_{2x}Cu_{1-x}Fe_xO_{4-y}$ exhibits a metallic character. No evidence for Cu(II)-O-Fe(IV) ${\leftrightarrow}$ Cu(III)-O-Fe(III) valence degeneracy was observed. In contrast, a small amount of Fe(IV) is observed with increasing x (x = 0.4 and 0.5), revealing a semiconducting behavior. These results suggest that the electronic interaction of Cu(III)-O-Fe(III) contributes greatly to the metallic character, while the electronic interaction of Cu(II)-O-Fe(IV) deteriorates the metallic character of $La_{2-2x}Sr_{2x}Cu_{1-x}Fe_xO_{4-y}$.

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References

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