Synthesis and Electrical Admittance (Y) Properties of Co Doped LaCrO3 Compounds


Coşkun F. M. , Polat Ö., Coşkun M. , Türüt A.

6th International Conference on Materials Science and Nanotechnology For Next Generation (MSNG2019), Niğde, Türkiye, 16 - 18 Ekim 2019, ss.17

Atıf İçin Kopyala
  • Basıldığı Şehir: Niğde
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayısı: ss.17

Özet

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 0C 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 0C 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.