A study of the microstructure and thermo–electrical properties of Bi2O3 ceramics co–doped with rare earth oxides

BALCI M., ARI M.

Journal of Materials Science: Materials in Electronics, cilt.34, sa.6, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 34 Sayı: 6
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s10854-023-09944-0
  • Dergi Adı: Journal of Materials Science: Materials in Electronics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, MEDLINE, Metadex, Civil Engineering Abstracts
  • Erciyes Üniversitesi Adresli: Evet

Özet

Bi2O3–based solid solutions containing rare earth oxides (Er2O3, Eu2O3, Gd2O3, and Ho2O3) have been produced through solid state reactions under atmospheric conditions. To study the impact of dopant concentration on phase structure and conductivity, the total dopant percentage is increased from 20 to 80%. According to the XRD patterns, only samples A2 (10%Er: 10%Eu: 10%Gd: 05%Ho) and B1 (05%Er: 05%Eu: 05%Gd: 10%Ho) are stabilized by the cubic δ–phase, indicating a homogeneous phase. During heating, the DTA curve of sample A1 (05%Er: 05%Eu: 05%Gd: 05%Ho) displays an endothermic peak at around 729 °C, indicating the phase transition from α–phase to δ–phase. The temperature dependent conductivity graph of the same sample confirm the phase transition due to a sudden increase in conductivity at that temperature value. At 750 °C, sample A2 has the highest conductivity and the lowest activation energy, with values of 0.0144 S.cm–1 and 0.48 eV, respectively. FE–SEM images indicate that the grain sizes are not uniform and decreases as the dopant concentration increases.