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Mossbauer Spectroscopic Study of La 2-2x Sr 2x Cu 1-x Fe x O 4-y (0≤x≤0.5) Solid-solution
| Content Provider | Semantic Scholar |
|---|---|
| Author | Park, Jung-Chul Byeon, Song-Ho Lee, Choong-Sub |
| Copyright Year | 2004 |
| Abstract | Tetragonal K 2 NiF 4 -type La 2 - 2 x Sr 2 x Cu 1 - x Fe x O 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 ≤ 0.3, Fe(III) is competing with the mixture of Cu(II) and Cu(III) and La 2 - 2 x Sr 2 x Cu 1 - x Fe x O 4 - y exhibits a metallic character. No evidence for Cu(II)-O-Fe(IV) ↔ 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 - 2 x Sr 2 x Cu 1 - x Fe x O 4 - y . |
| Starting Page | 97 |
| Ending Page | 100 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| DOI | 10.5012/bkcs.2004.25.1.097 |
| Volume Number | 25 |
| Alternate Webpage(s) | http://ocean.kisti.re.kr/downfile/volume/chemical/JCGMCS/2004/v25n1/JCGMCS_2004_v25n1_97.pdf |
| Alternate Webpage(s) | https://doi.org/10.5012/bkcs.2004.25.1.097 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
