Synthesis and Characterization of Nanosized Dy-Doped of Ceria Developed by Microwave Assisted Combustion Route

Abstract

Nanosized Ce 1-x Dy x O 2-x/2 (DDC, were synthesized by combustion routes induced by microwaves (MS) and compared with the same composition prepared by conventional (CS) method. The conventional and microwave sintering routes were also used to consolidate the pellets. The samples were characterized by X-ray diffractometry (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and AC impedance spectroscopy. The as-combusted powders prepared by microwaves were found to be pure oxides with low crystallinity, and exhibited excellent sintering behavior. Highly dense DDC pellets with fine and homogeneously grown grains (400 nm) were achieved by microwave, while conventionally densified pellets had average grain size of 1100 −1400 nm. The ionic conductivity measured for pellet sintered by MS at 1050 • C for 1 h is, σ 550• C = 7.42 × 10 −2 S/cm, Ea = 0.86 eV, and for CS at 1300 • C for 5 h, is σ 550 • C = 9.79 × 10 −3 S/cm, Ea = 1.05 eV.

Exploration of Atomic Scale Changes during Oxygen Vacancy Dissociation Mechanism in Nanostructure Co-Doped Ceria: As Electrolytes for IT-SOFC

“…The co-dopant compositions were selected on the basis of optimized composition of single dopant for highest ionic conductivity, which was (x = 0.15) in most of the earlier reports. [37][38][39][40][41][42][43] For the synthesis of the systems, all nitrate precursors procured from Sigma Aldrich, USA were used without further purification. The detail of the synthesis procedure is given elsewhere in our earlier work.…”