Phase transition in the oxygen and proton conductor Ba2In2O5 in humid atmospheres below 300°C

Schober, T.; Friеdrich, J.; Krug, F.

doi:10.1016/s0167-2738(97)00203-8

Cited by 63 publications

(70 citation statements)

References 7 publications

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“…6. As reported in the literature [12,25,26] this change is related to the loss of H 2 O incorporated into the crystal structure of the materials. Hashimoto et al [25] have concluded that the incorporation of water in as-prepared Ba 2 In 2 O 5 is due to the absorption of water from the atmosphere and that this process did not affect the crystal structure of the material.…”

Section: Thermogravimetric Analysis and Dscmentioning

confidence: 56%

Preparation and characterization of Ce- and La-doped Ba2In2O5 as candidates for intermediate temperature (100–500°C) solid proton conductors

Janković

Wilkinson

Hui

2012

Journal of Power Sources

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a b s t r a c tFive different compositions of brownmillerite materials, Ce-and La-doped, and undoped Ba 2 In 2 O 5 were synthesized via the solid-state reaction and the glycine-nitrate combustion process. Properties of the materials were characterized using XRD, HR-TEM, and TGA/DSC techniques. Conductivity measurements by AC impedance spectroscopy, performed in air and hydrogen-containing atmospheres, in the temperature range from 100• C to 500• C, were correlated to the properties of the materials and revealed the effects of dopant, microstructure, temperature and atmosphere on the total electrical conductivity of the materials. All compositions showed low conductivity in air. In hydrogen-containing atmospheres, while Ce-and La-doped Ba 2 In 2 O 5 showed low conductivity (4 × 10 −6 -3 × 10 −6 S cm −1 at 500 • C), undoped Ba 2 In 2 O 5 demonstrated a surprisingly high conductivity (between 0.02 S cm −1 and 0.7 S cm −1 in the temperature range from 300• C to 500• C), especially samples produced by the glycine-nitrate process. This finding creates potential opportunity for using Ba 2 In 2 O 5 as a proton-conductive material in intermediate temperature fuel cells.

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Section: Thermogravimetric Analysis and Dscmentioning

confidence: 56%

Preparation and characterization of Ce- and La-doped Ba2In2O5 as candidates for intermediate temperature (100–500°C) solid proton conductors

Janković

Wilkinson

Hui

2012

Journal of Power Sources

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“…5,[9][10][11][12][13][14][15] To maintain charge balance, one sixth of the oxygen anions are removed and a high concentration of oxygen vacancies is formed. At low temperatures, the vacancies are ordered in parallel rows ͑tetrahedral oxygen vacancy layers͒ alternating with mainly vacancy-free octahedral perovskite layers.…”

mentioning

confidence: 99%

Proton Conductivity and Stability of Ba[sub 2]In[sub 2]O[sub 5] in Hydrogen Containing Atmospheres

Janković

Wilkinson

Hui

2011

J. Electrochem. Soc.

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Ba 2 In 2 O 5 is one of the oxygen deficient ceramic materials widely investigated for both oxygen ion conduction and proton conduction in oxidizing atmospheres. However, its electrochemical properties have not been studied in hydrogen containing atmospheres. In this work, the electrical conductivity of Ba 2 In 2 O 5 in hydrogen containing atmospheres was investigated by ac impedance spectroscopy in the temperature range between 100 and 500°C and compared to its conductivity in air and nitrogen in order to estimate the contribution of proton conductivity to the total conductivity. A stable electrical conductivity of over 0.3 S/cm was achieved in the temperature range of 300-480°C in a 50% vol H 2 /50% vol N 2 atmosphere. Electromotive force measurements ͑and complimentary open circuit cell voltage measurements͒ revealed high proton transport numbers over the temperature range. Ba 2 In 2 O 5 shows chemical stability in hydrogen containing atmospheres at temperatures up to 480°C, while decomposing at higher temperatures. Mechanical instability was noticed in humid atmospheres at 400°C and above. This previously unreported high conductivity in H 2 atmosphere creates an opportunity for use of Ba 2 In 2 O 5 as a proton conductive material for a range of intermediate temperature electrochemical devices.

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“…6,7 In addition, at low temperatures, a p-type contribution to the conductivity is observed in oxidising atmospheres due to oxygen incorporation according to equation 2.…”

mentioning

confidence: 99%

Enhancement of the conductivity of Ba2In2O5 through phosphate doping

et al. 2010

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Phase transition in the oxygen and proton conductor Ba2In2O5 in humid atmospheres below 300°C

Cited by 63 publications

References 7 publications

Preparation and characterization of Ce- and La-doped Ba2In2O5 as candidates for intermediate temperature (100–500°C) solid proton conductors

Preparation and characterization of Ce- and La-doped Ba2In2O5 as candidates for intermediate temperature (100–500°C) solid proton conductors

Proton Conductivity and Stability of Ba[sub 2]In[sub 2]O[sub 5] in Hydrogen Containing Atmospheres

Enhancement of the conductivity of Ba2In2O5 through phosphate doping

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