IRON SUBSTITUTION EFFECTS IN YBA2CU4O8 SYNTHESIZED BY THE SOL-GEL TECHNIQUE

被引:11
作者
KARPPINEN, M
LINDEN, J
VALO, J
KAREIVA, A
KOZLOV, V
TERRYLL, K
NIINISTO, L
LESKELA, M
RAO, KV
机构
[1] HELSINKI UNIV TECHNOL, DEPT TECH PHYS, SF-02150 ESPOO, FINLAND
[2] UNIV HELSINKI, DEPT CHEM, SF-00014 HELSINKI, FINLAND
[3] ROYAL INST TECHNOL, DEPT CONDENSED MATTER PHYS, S-10044 STOCKHOLM, SWEDEN
[4] VILNIUS STATE UNIV, DEPT GEN & INORGAN CHEM, VILNIUS 2006, LITHUANIA
关键词
D O I
10.1088/0953-2048/8/2/002
中图分类号
O59 [应用物理学];
学科分类号
摘要
Bulk YBa2((Cu1-yFey)-Fe-57)(4)O-8 samples with y = 0.00-0.05 were synthesized by an aqueous sol-gel method under 1 atm oxygen pressure. The samples were characterized by XRD for phase purity and lattice parameters, by thermal analysis for oxygen stability as well as by magnetic susceptibility and SQUID, measurements for magnetic and superconducting properties, Iron was found to both destabilize the YBa2Cu4O8 phase and have a strong effect on its properties even at very low concentrations. The site assignment proposed for the iron dopant is based on the results of Fe-57 Mossbauer spectroscopy studies. The results are compared with the observed iron doping effects in the YBa2Cu3O7-delta phase.
引用
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页码:79 / 84
页数:6
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