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50 mol% indium substituted BaTiO3: Characterization of structure and conductivity

Seikh Rahman (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Christopher S Knee (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Istaq Ahmed (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; R. Haugsrud
International Journal of Hydrogen Energy (0360-3199). Vol. 37 (2012), 9, p. 7975-7982.
[Artikel, refereegranskad vetenskaplig]

BaTi0.5In0.5O3-delta was prepared by solid state reaction at 1400 degrees C. Rietveld analysis of high resolution X-ray powder diffraction data indicated phase pure as-prepared material that adopts a cubic perovskite structure with a = 4.1536(1) angstrom. Thermogravimetric analysis revealed the presence of significant levels of protons in the as-prepared material and 57% of the theoretically achievable protonation was attained on exposure to a humid environment at 185 degrees C. After hydration the cell parameter increased to 4.1623(1) angstrom. Electrical conductivity was measured both with fixed and variable frequency ac impedance methods as a function of temperature, oxygen-, water vapour- and heavy water vapour partial pressures. In the temperature range 400-800 degrees C a slight increase in the total conductivity with increasing oxygen partial pressure is encountered, characteristic of a contribution from p-type charge carriers. The effect of the water vapour pressure on conductivity below 600 degrees C is much more prominent indicative of dominant proton conduction. At 300 degrees C the total conductivity in wet O-2 was estimated to be 9.30 x 10(-5) S/cm. At T > 800 degrees C the material is a pure oxide ion conductor.

Nyckelord: Barium titanate, Perovskite, Brownmillerite, Proton conductivity, X-ray diffraction, Impedance, quantum molecular-dynamics, temperature protonic conductors, oxides, transport, bazro3, ba2in2o5-rectangle, perovskites, hydrogen, baceo3



Denna post skapades 2012-07-05. Senast ändrad 2016-08-22.
CPL Pubid: 160123

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur

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