ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Single-phase nickel manganese ferrites, NixMn1−xδFe2+δO4, have been prepared by mild heating of solid solutions of nickel-manganese-iron formates obtained by coprecipitation. Dilatometric and X-ray diffraction studies were conducted at different temperatures, showing the different stages of the sintering process of highly densified nickel manganese ferrite ceramics (density, 94%–96%). Granulometric and SEM studies showed that the oxide particles formed agglomerates of 4 μm, with a narrow size distribution. XPS studies showed that Fe2+ was oxidized to Fe3+ on the ceramic surface. Finally, electrical measurements showed that Fe2.16Mn0.074Ni0.10O4 presented the minimum resistivity (1340 Ωcm). The sensitivity indices were around 4000 K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00362142
Permalink