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Synthesis of Mixed Conducting Ceramic Oxides SrFeCo 0.5 O y Powder by Hybrid Microwave Heating
Author(s) -
Huo Di,
Zhang Jinsong,
Xu Zhijun,
Yang Yongjin,
Yang Hongcai
Publication year - 2002
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.1151-2916.2002.tb00125.x
Subject(s) - orthorhombic crystal system , materials science , analytical chemistry (journal) , perovskite (structure) , phase (matter) , spinel , particle size , ceramic , mineralogy , crystallography , crystal structure , chemistry , metallurgy , organic chemistry , chromatography
Mixed conducting ceramic oxide SrFeCo 0.5 O y powders were prepared by a conventional solid‐state reaction method and two types of hybrid microwave heating methods. XRD, SEM/EDS (energy‐dispersive spectroscopy), and TEM/EDX (energy‐dispersive X‐ray microanalysis) were used to characterize the products. The conventional heated sample is a three‐phase mixture composed of a predominant orthorhombic Sr 4 (Fe 1− x Co x ) 6 O 13±δ phase, a cubic perovskite SrFe 1− x Co x O 3−δ phase, and a CoO phase. Phase components of the direct hybrid heated samples are similar to those of the conventional heated sample, except that its predominant phase is a cubic perovskite SrFe 1− x Co x O 3−δ phase other than the orthorhombic Sr 4 (Fe 1− x Co x ) 6 O 13±δ phase. The indirect hybrid heated sample is mainly composed of a cubic perovskite Sr(Fe,Co) 1.5 O y phase, with a trace amount of orthorhombic phase and spinel (Fe,Co) oxides. The cobalt content of the Sr(Fe,Co) 1.5 O y phase is much higher than that of the SrFe 1− x Co x O 3−δ phase. Particle size distribution of the conventional heated sample is very wide. The indirect hybrid heated sample has a relatively narrow particle size distribution, with an average particle size of 3–4 μm, but the particles stick to form agglomerates. The morphology of the direct hybrid heated sample is similar to that of the conventional heated sample, except that submicrometer grade particles were rarely observed.