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Titolo:
NICKEL-IRON ALLOY MAGNETITE COMPOSITES - SYNTHESIS AND MICROSTRUCTURE/
Autore:
NOUBEYO JCY; BOUAKHAM T; POURROY G; WERCKMANN J; EHRET G;
Indirizzi:
INST PHYS & CHIM MAT STRASBOURG,GRP MAT INORGAN,CNRS,UMR 046,23 RUE LOESS F-67037 STRASBOURG FRANCE INST PHYS & CHIM MAT STRASBOURG,GRP MAT INORGAN,CNRS,UMR 046 F-67037 STRASBOURG FRANCE
Titolo Testata:
Journal of solid state chemistry
fascicolo: 2, volume: 135, anno: 1998,
pagine: 210 - 217
SICI:
0022-4596(1998)135:2<210:NAMC-S>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
REDUCTION; TEMPERATURE; HYDROGEN; SIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
J.C.Y. Noubeyo et al., "NICKEL-IRON ALLOY MAGNETITE COMPOSITES - SYNTHESIS AND MICROSTRUCTURE/", Journal of solid state chemistry, 135(2), 1998, pp. 210-217

Abstract

We describe the procedure to obtain composites made of a nickel-iron ahoy and magnetite. A KOH concentration of 14 mol/liter is required, Metal diffraction lines are broad, due to heterogeneous composition andbad crystallization, Balls Of metal 0.1-0.2 mu m wide stuck to magnetite octahedra are easily observed by SEM and TEM. Nickel hydroxide crystallizes for a nickel to iron ratio >0.33 int addition to metal and spinel, HRTEM shows metal and spinel grains covered by a thin layer of NiO crystals of 20 nm recovered by an amorphous phase 2-3 nm wide, This latter crystallizes in NiO under the electron beam, Crystallographical relationships occur between NiO and the spinel phase, Well-crystallized and hydroxide-free nickel-iron alloy/magnetite composites are obtained in all cases after annealing at 800 degrees C in an argon atmosphere, (C) 1998 Academic Press.

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Documento generato il 04/12/20 alle ore 19:06:11