Synthesis and characterization of nonstoichiometric nickel manganite spinels Ni{sub x}Mn{sub 3{minus}x}{open_square}{sub 3{delta}/4}O{sub 4+{delta}}
- Univ. Paul Sabatier, Toulouse (France). Lab. de Chimie des Materiaux Inorganiques
The Ni{sub x}Mn{sub 3{minus}x}O{sub 4} spinels have been widely studied, especially in view of their application as thermistor ceramics. Nickel manganites have been prepared by thermal decomposition of mixed oxalates Ni{sub x/3}Mn{sub (3{minus}x)/3}C{sub 2}O{sub 4}{center_dot}nH{sub 2}O in air at 623 K (0 {le} x {le} 1). These oxides are finely divided materials because their BET specific surface areas are close to 100 m{sup 2}/g and the average diameter of their crystallites is about 10 nm. Electron diffraction studies of these compounds show that they crystallize in a spinel-like cubic structure. Thermogravimetric analyses show that these oxides are nonstoichiometric cation deficient spinels Ni{sub x}Mn{sub 3{minus}x}{open_square}{sub 3{delta}/4}O{sub 4+{delta}}. {delta} depends on nickel content and reaches a maximum of 0.9 for x = 0.4.
- OSTI ID:
- 455246
- Journal Information:
- Materials Research Bulletin, Vol. 32, Issue 2; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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