Electrical Conductivity of Er2O3-Doped c-ZrO2 Ceramics

AKTAŞ B., TEKELİ S., Kucuktuvek M.

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.23, sa.1, ss.349-355, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 1
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1007/s11665-013-0750-5
  • Dergi Adı: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.349-355
  • Anahtar Kelimeler: Er2O3, electrical conductivity, solid oxide fuel cell (SOFC), yttria-stabilized cubic zirconia (c-ZrO2), IONIC-CONDUCTIVITY, STABILIZED ZIRCONIA, GRAIN-BOUNDARIES, MICROSTRUCTURE, SIZE, ZRO2
  • Gazi Üniversitesi Adresli: Evet

Özet

The effect of Er2O3 addition on electrical conductivity of c-ZrO2 was investigated by analyzing the impedance spectra of undoped and various amounts of Er2O3-doped cubic zirconia (c-ZrO2). The undoped and 1-15 wt% Er2O3-doped c-ZrO2 powders were prepared via colloidal process. The doped powders were then pelletized under a pressure of 200 MPa. In addition, the undoped and Er2O3-doped c-ZrO2 specimens were sintered at 1500 A degrees C for 1 h. The electrical conductivity of the specimens was measured using a frequency response analyzer in the frequency range of 100 mHz-13 MHz, in the temperature range of 300-800 A degrees C. Electrical conductivity results indicate an increase in the conductivity with increase in the test temperature. The addition of 1 wt% Er2O3 into c-ZrO2 led to an increase in the grain interior, grain boundary, and total conductivities. The distortion caused by the addition of Er3+ cations in the c-ZrO2 lattice leads to an increase in the concentration of oxygen vacancies in the c-ZrO2 matrix, resulting in an enhancement in the electrical conductivities.