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

Authors
KALOGIROU O BONSDORF G STOIKOS G GUNSSER W PAPADIMITRAKICHLICHLIA H
Citation
O. Kalogirou et al., THERMAL-DECOMPOSITION PROCESS OF POLYCRYSTALLINE CD-STABILIZED MONOVALENT-CATION AND DIVALENT-CATION BETA''-FERRITES AND BETA-FERRITES, Solid state ionics, 74(3-4), 1994, pp. 205-209
Citations number
12
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
Solid state ionics → ACNP
ISSN journal
01672738
Volume
74
Issue
3-4
Year of publication
1994
Pages
205 - 209
Database
ISI
SICI code
0167-2738(1994)74:3-4<205:TPOPCM>2.0.ZU;2-9
Abstract
DTA curves and XRD show that the polycrystalline Cd-stabilized Cs+-, A g+-, 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 hi gher temperatures due to the liberation of NH4+ ions and Na+-evaporati on respectively.