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Structure of Highly Divided Nonstoichiometric Iron Manganese Oxide Powders Fe3−xMnx□3δ/4O4+δ

✍ Scribed by Sophie Guillemet-Fritsch; Sophie Viguié; Abel Rousset

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
201 KB
Volume
146
Category
Article
ISSN
0022-4596

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✦ Synopsis

Highly

divided iron manganese oxide powders, Fe 3 ؊ x Mn x ) 3 /4 O 4 ؉ , were prepared at low temperature (T45603C) by the thermal decomposition of mixed oxalate precursors Fe 1 ؊ Mn C 2 O 4 , 2H 2 O ( ‫؍‬ x/3). The manganeserich compounds (x51.5) have a complex structure that can be cubic, tetragonal, or a mixture of both tetragonal and cubic spinel phases that indicates a lack of miscibility existing in the Fe 3 O 4 +Mn 3 O 4 phase diagram at low temperature. The structure strongly depends on the chemical composition but also on the nonstoichiometric coe7cient ( ). It has been identi5ed as one of the mineral 99vredenburgite:: and has never been reported before for powders prepared by chimie douce. The oxygen excess, determined by thermogravimetric analyses, is the highest ( ‫؍‬ 0.4) when the oxide is prepared at 4103C. Theses oxides are defect spinel phases containing cationic vacancies.

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