|  |   |       e
 
 
 
  
 
 


" .."
3
1. $YBaCo_4O_{7+x}(x=0,0.1,0.2)$
2. -,
3. YBa_2Cu_3O_{6+x}
.., .., .., ..
, 1999 ., 115, . 1, . 268
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