Open AccessINFLUENCE OF HIGH Sn CONCENTRATIONS ON THE STRUCTURE AND PROPERTIES OF Y-Ba-Cu-O COMPOUNDS
Author(s) -
Daoyuan Zhang,
Genmiao Wang,
Yuxia Wang,
Wang Shou Zheng,
Yuheng Zhang
Publication year - 1990
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.39.1815
Subject(s) - superconductivity , mössbauer spectroscopy , dopant , materials science , metal , mössbauer effect , ion , high temperature superconductivity , crystallography , analytical chemistry (journal) , condensed matter physics , chemistry , doping , physics , metallurgy , optoelectronics , organic chemistry , chromatography
Mossbauer measurements of YBa2Cu3-xSnxO7-y compounds with high Sn concentrations have revealed that the Sn dopants all exist as Sn4+, with their majority occupying Ba, Y, Cu(2) sites, and only a small part at Cu(l) sites. The amount of Sn at each site varies with Sn content (x). As for superconductivity, the sample systems are all with Tc above 77 K, this indicates that the substitutions for the metal ions on Cu(2) and Y sites have small effect on Tc, which strongly supports the concept that Cu-O plane does not predominate the superconductivity.