Synthesis of NiFe2O4 in the presence of fluorine

Ferrite formation in compacts of NiO-Fe2O3 mixture was studied at 700-1100C. The effect of fluoride was studied by placing these compacts on top of green AlF3 compacts during firing. On the basis of results it is concluded that F- ions originating via the gas phase replace O2- ions thus causing cati...

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Bibliographic Details
Published inJournal of materials science letters Vol. 4; no. 2; pp. 200 - 202
Main Authors BOSVIC, S, KOSTIC, E, KISS, S. J
Format Journal Article
LanguageEnglish
Published Dordrecht Kluwer Academic Publishers 01.01.1985
Subjects
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
Ferrites
Nickel Oxides
Preparation
Reaction mechanism
Kinetics
Iron III Oxides
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Summary:Ferrite formation in compacts of NiO-Fe2O3 mixture was studied at 700-1100C. The effect of fluoride was studied by placing these compacts on top of green AlF3 compacts during firing. On the basis of results it is concluded that F- ions originating via the gas phase replace O2- ions thus causing cation vacancies which in turn enhance ferritization and retard densification. Slower densification in turn acts against ferritization. These opposing effects explain why AlF3 augments ferritization at lower temperatures but retards it at higher temperatures. 3pp 3fig 1tab
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0261-8028
1573-4811
DOI:10.1007/BF00728076