Synthesis, structure and electrical conductivity of a new perovskite type barium cobaltate BaCoO1.80(OH)0.86. Issue 32 (25th July 2018)

• Record Type: Journal Article
• Authors: Waidha, Aamir Iqbal; Lepple, Maren; Wissel, Kerstin; Benes, Alexander; Wollstadt, Stephan; Slater, Peter R.; Fortes, A. D.; Clemens, Oliver
• Is Part Of: Dalton transactions. Volume 47:Issue 32(2018)
• Page Start: 11136
• Page End: 11145
• Publication Date: 2018-07-25
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt01326h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : BaCoO1.80 (OH)0.86, a new member of the perovskite family showing ordering of vacancies and protons. Abstract : Perovskite oxides exhibiting mixed protonic and electronic conductivities have interesting applications in protonic ceramic fuel cells. In this work, we report on a hydrated phase of BaCoO1.80 (OH)0.86 synthesized using nebulized spray pyrolysis. Structural analysis based on X-ray and neutron powder diffraction data showed that the compound is isotypic to BaFeO2.33 (OH)0.33 . The water loss behaviour was studied using simultaneous thermal analysis and high temperature X-ray diffraction, indicating that protons (respectively water) can be stabilized within the compound up to temperatures significantly above 673 K, confirmed by ex situ Fourier transform infrared spectroscopy studies. Impedance spectroscopy was used to determine the conductivity characteristics of BaCoO1.80 (OH)0.86, finding and a total electrical conductivity in the order of 10 −4 S cm −1 at ambient temperature with an activation energy of 0.28 eV.