Proton conduction in perovskite oxide BaZr(0.5)Yb(0.5)O(3-delta) prepared by wet chemical synthesis route

作者：Ahmed Istaq^*; Knee Christopher S; Eriksson Sten Gunnar; Ahlberg Elisabet; Karlsson Maths; Matic Aleksandar; Borjesson Lars

来源：Journal of the Electrochemical Society, 2008, 155(11): P97-P102.

DOI：10.1149/1.2969806

A wet chemical route has been used to synthesize the oxygen deficient perovskite BaZr(0.5)Yb(0.5)O(3-delta). Analysis of X-ray powder diffraction data showed that both dried and hydrated samples adopt cubic crystal structures of space group Pm (3) over barm. Dynamic thermogravimetric analysis showed a significant mass loss for the hydrated sample compared to the dried sample, indicating that similar to 28% of the oxygen vacancies are filled by protonic defects. The strong O-H stretch band, 2500-3500 cm(-1), in the IR absorbance spectrum also clearly manifests the presence of significant levels of protons in the hydrated material. Proton conductivity was investigated on prehydrated (under dry Ar) and as-prepared (under wet Ar) samples. The heating cycle of the prehydrated sample showed higher proton conductivity compared to the cooling cycle, especially in the intermediate temperature range (150-550 degrees C). Finally, comparison with data for BaZr(0.9)Yb(0.1)O(3-delta) revealed that the more heavily doped sample showed higher proton conductivity compared to the more lightly doped sample.

• 出版日期2008