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Order‐Disorder Phase Formation in the Complex Perovskite Compounds Ba(Ni 1/3 Nb 2/3 )O 3 and Ba(Zn 1/3 Nb 2/3 )O 3
Author(s) -
Hong Kug Sun,
Kim InTae,
Kim ChongDon
Publication year - 1996
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.1151-2916.1996.tb08098.x
Subject(s) - pyrochlore , transmission electron microscopy , perovskite (structure) , materials science , phase (matter) , crystallography , scanning electron microscope , analytical chemistry (journal) , nickel , electron diffraction , spectroscopy , grain boundary , x ray crystallography , diffraction , atmospheric temperature range , microstructure , chemistry , metallurgy , nanotechnology , optics , physics , organic chemistry , chromatography , composite material , quantum mechanics , meteorology
The order‐disorder phase formation of the complex perovskite compounds Ba(Ni 1/3 Nb 2/3 )O 3 (BNN) and Ba(Zn 1/3 ‐Nb 2/3 )O 3 (BZN) was investigated using X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy‐dispersive spectroscopy. The BNN and BZN samples were sintered over a temperature range of 1200° to 1500°C in air for 2 h. X‐ray diffraction and transmission electron microscopy showed that these compounds exhibited a 1:2 ordering on the B‐site within a narrow temperature range. When BNN and BZN were sintered above 1400° and 1350°C, respectively, a liquid phase formed in the grain boundary which was accompanied by disordering. The composition of the liquid phase resembled that of pyrochlore, with a small amount of nickel for BNN or zinc for BZN. The disordering with the formation of the liquid phase was attributed to the increase in defect concentration.