|  |   |       e
 
 
 
  
 
 


" .."
4
1. $Cu_2FeBO_5$
2. PbSc1/2Ta1/2O3 PbSc1/2Nb1/2O3
3. RbMnX3 (X -- F, Cl, Br)
4. K_2NaAlF_6,K_3AlF_6 Na_3AlF_6
.., .., ..
, 1998 ., 114, . 5, . 1742
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