The perovskite structure material La 0.35 Sr
0.6 MnO 3 was sintered in air and
the mixed ceramic of a 0.35 Sr 0.6
MnO 3 and 8 mol % Y 2 O
3 +ZrO 2 with a 1:1 mass rate
was also sintered in air, both at 1530 K for 12 hour. The AC complex impedance
spectra have been measured and the effect of the interface between La
0.35 Sr 0.6 MnO
3 and YSZ on dielectric relaxation properties of La
0.35 Sr 0.6 MnO
3 has been investigated. A schematic of diffusion phase
formation and the equivalent circuits are proposed for explaining the results.
In the complex impedance spectra, the first and second semicircles correspond
to the grain-boundary and interface respectively. The results show that the
dielectric relaxation properties and structure of the mixed ceramic are
different to that of single phase La 0.35 Sr
0.6 MnO 3 . The interface has an
important effect on the electric properties of the mixed ceramic and produces
a dielectric relaxation in low frequency.
CAPACITOR MODEL OF CONCRETE COARSE AGGREGATE BY DIELECTRIC RELAXATION PROPERTIES
