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Effect of La Doping on the Phase Conversion, Microstructure Change, and Electrical Properties of Bi 2 Fe 4 O 9 Ceramics
Author(s) -
Miao Ju Hong,
Fang TsangTse,
Chung HanYang,
Yang ChaoWei
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03238.x
Subject(s) - microstructure , materials science , doping , analytical chemistry (journal) , perovskite (structure) , calcination , ceramic , phase (matter) , mullite , mineralogy , crystallography , metallurgy , chemistry , optoelectronics , biochemistry , organic chemistry , catalysis , chromatography
Undoped and La‐doped Bi 2 Fe 4 O 9 ceramics were synthesized using a soft chemical method. It is observed that in calcining La‐doped Bi 2 Fe 4 O 9 , Bi(La)FeO 3 phase rather than Bi 2− x La x Fe 4 O 9 gradually increases with increasing La doping content. The phase conversion from mullite‐type structure of Bi 2 Fe 4 O 9 to rhombohedrally distorted perovskite one of Bi(La)FeO 3 with increasing La doping content indicates that La doping can stabilize the structure of BiFeO 3 . This is further evidenced that Bi 2 Fe 4 O 9 can be directly converted to Bi(La)FeO 3 by heating the mixtures of nominal composition of Bi 2 Fe 4 O 9 / x La 2 O 3 . Furthermore, the microstructure changes and the room temperature hysteresis loops and leakage current for Bi 2− x La x Fe 4 O 9 with x =0 and 0.02 were characterized.