Enhancing ion conductivity depending on calcination conditions for the (BiO<sub>1.5</sub>)<sub>1-x-y</sub>(ErO<sub>1.5</sub>)<sub>x</sub> (DyO<sub>1.5</sub>)<sub>y</sub> ceramic electrolytes at intermediate temperatures

BALCI M., Payveren M. A., SAATÇİ B., ARI M.

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, cilt.323, 2026 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 323
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.mseb.2025.118870
  • Dergi Adı: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Solid-state reaction, Differential thermal analysis, Order-disorder transition, Electrical conductivity, Scanning electron microscopy
  • Erciyes Üniversitesi Adresli: Evet

Özet

Bi2O3, with its face-centered cubic crystal structure, has higher oxygen ion conductivity than other ceramic ion conductors at the comparable temperatures. Maintaining this phase while keeping superionic characteristics makes it a suitable electrolyte for SOFC units operating at moderate temperatures. The current research focused on the influence of calcination temperature on the crystalline structure and thermoelectric characteristics of all ceramic electrolytes. The XRD patterns prove that when the calcination temperature increases, the minor peaks indicating the mixed phase decrease, and all specimens except the (BiO1.5)(0.92)(ErO1.5)(0.04)(DyO1.5)(0.04) are stable at room temperature. The existence of endothermal peaks on the DTA curves at around 600 degrees C clearly indicates the order-disorder transition (ODT). Conductivity generally increases with an increase in the calcination temperature, and the highest conductivity is found to be 0.38 S/cm at 800 degrees C for the (BiO1.5)(0.88)(ErO1.5)(0.04)(DyO1.5)(0.08.) This value is comparable to studies that get the optimum conductivity with a double-doping technique. The FE-SEM images show the atomic aggregations and pores on the grain boundary at low-temperature calcination (<730 degrees C), but above it, they are smooth, and the grain boundary lines are straight, which indicates low boundary resistance.