6thInternational CONFERENCE ON MATERIALS SCIENCE AND NANOTECHNOLOGY FOR NEXT GENERATION (MSNG2019), Niğde, Türkiye, 16 - 18 Ekim 2019, ss.87-90
The cobalt (Co) doped LaCrO3 (LCO) powder was synthesized by solid-state reaction method using La2O3
(ACROS, 99.9%), Cr2O3 (ACROS, 99%) and Co2O3 (Alfa Aesar, 99%) powders were used as starting materials.
For the preparation of Co doped LaCrO3 powders, Co2O3 (Alfa Aesar, 99%) powder with various mol % (1, 10, 15)
were mixed with La2O3 (ACROS, 99.9%) and Cr2O3 (ACROS, 99%) powders. The obtained powders were
calcined at 1200 °C for 12 h in air ambient in order to obtain desired homogeneity and crystalline structure. After
the calcination, the powders were pressed under 10 tons pressure to prepare pellets. Those pellets were
annealed at 1150 °C to obtain enough hardness. Novocontrol Broadband Dielectric/Impedance Spectrometer
equipped with liquid nitrogen dewar was employed for frequency dependent electrical admittance (Y)
measurements of prepared pellet samples. Measurement temperature of the samples was gradually varied from -
100 °C to 100 °C with 20 °C step. Real part of admittance (Y') showed both frequency independent (lower
frequency region) and frequency dependent (higher frequency region) regions for all samples. Imaginary part of
admittance (Y'') first decreased with increasing frequency and reached a minimum value and increased with
increasing frequency for all samples. The total admittance showed similar behavior to real part one. Finally, the
increasing Co doping ratio caused admittance parameter to decrease.