Electronic Resource
Springer
Hyperfine interactions
42 (1988), S. 1231-1234
ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Mössbauer measurement is made on the system YBa2Cu3−xFexO7−y (0.03≤x≤1.0) at various temperatures. It is found that the sites occupied by Fe ions can be classified into major two and minor one groups. The isomer shifts for the major two groups are nearly zero relative to metallic iron, and their quadrupole splittings are large (about 1.9 and 1.1 mm/s). By comparison of the spectra measured before and after a heat-treatment in vacuum, it is concluded that the Fe ions with the largest quadrupole splitting occupy the pyramidal sites, and the other the planer sites. Two different hyperfine magnetic fields (240 and 442 k0e) are observed at 1.7 K for the specimen with x=0.2. It is proposed that the valence states of Fe ions of the major two groups are pentavalent.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02395615
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