THERMAL-DECOMPOSITION PROCESS OF POLYCRYSTALLINE CD-STABILIZED MONOVALENT-CATION AND DIVALENT-CATION BETA''-FERRITES AND BETA-FERRITES

被引：3
|
作者：
KALOGIROU, O
BONSDORF, G
STOIKOS, G
GUNSSER, W
PAPADIMITRAKICHLICHLIA, H
机构：
[1] UNIV DRESDEN,INST INORGAN CHEM,W-8027 DRESDEN,GERMANY
[2] UNIV HAMBURG,INST PHYS CHEM,D-20146 HAMBURG,GERMANY
来源：
SOLID STATE IONICS | 1994年 / 74卷 / 3-4期
关键词：
BETA''-ALUMINA; BETA''-FERRITE; THERMAL DECOMPOSITION; THERMAL ANALYSIS;
D O I：
10.1016/0167-2738(94)90211-9
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
DTA curves and XRD show that the polycrystalline Cd-stabilized Cs+-, Ag+-, Na+-, Li+-, NH4+-beta''-ferrites, Ca2+-, Sr2+-, Ba2+-, Mg2+-beta''-ferrites and Pb2+-, Cd2+-beta-ferrites, prepared by ion exchange on K+-beta''-ferrite decompose at different temperatures, 260-820-degrees-C, to alpha-Fe2O3 and CdFe2O4, or mixtures of hexaferrites and spinel-type ferrites, depending on the substituting ion. TG curves exhibited a weight loss, 1-4%, at 50-300-degrees-C due to dehydration and at higher temperatures due to the liberation of NH4+ ions and Na+-evaporation respectively.
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页码：205 / 209
页数：5
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