抄録
NiFe2O4+ 0∼100 vol.% NiO sintered bodies were prepared by mixing NiFe2O4 and NiO powders, and subsequent sintering at 800°C in air for 1 hour. Slopes in the temperature dependence of resistivity curves in the system have been found to abruptly changed, except for a composition of NiFe2O4+ 50 vol.% NiO. To investigate the mechanism of this phenomenon, NiFe2O4 powder was analyzed by high temperature X-ray diffraction, a thermo-gravimetry and differential thermo analysis. In the range from 100 to 300°C, the structure of NiFe2O4 phase does not change. Therefore the mechanism of this phenomenon is not related to any phase transition or the contamination of NiO.
