Electric conduction-blocking effects of voids and second phases in stabilized zirconia

Dessemond, Laurent; Muccillo, R.; Hénault, Marc; Kleitz, M.

doi:10.1007/bf00331217

Cited by 51 publications

(28 citation statements)

References 4 publications

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“…The intergrain contribution to the total resistivity is given by the R ig /R tot ratio (also known as blocking factor˛R [41]). In the case of stabilized zirconia (YSZ), it has been shown that˛R becomes zero around 730 • C [41].…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Dense La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte for IT-SOFC's: Sintering study and electrochemical characterization

Traina

Henrist

Vertruyen

et al. 2011

Journal of Alloys and Compounds

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Section: Electrochemical Characterizationmentioning

confidence: 99%

Dense La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte for IT-SOFC's: Sintering study and electrochemical characterization

Traina

Henrist

Vertruyen

et al. 2011

Journal of Alloys and Compounds

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“…Figure 9 shows the grain size dependence of the blocking factor of investigated samples. Some literature data on yttria-doped zirconias are also reported for comparison [14,16,[31][32][33]. It is worth noting that the higher a bl values determined from reference [31] originate from a higher SiO 2 content of the pellets.…”

Section: Original Research Papermentioning

confidence: 95%

Blocking Effect in High Purity Nanostructured Cubic Zirconia Ceramics

Boulfrad¹,

Djurado²,

Dessemond³

2008

Fuel Cells

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International audienceElectrical properties of grain boundaries, free of any secondary phases, have been investigated in cubic nanostructured zirconia ceramics. Pure 8YSZ powders were synthesised by spray pyrolysis process. These powders were used to perform dense nanostructured ceramics using two compaction techniques: cold isostatic pressing (CIP) and hot uniaxial pressing (HUP) in an oxidising atmosphere. Grain sizes ranging from 25 to 242 nm and relative densities from 93 up to 98% were obtained. Electrical contribution of the bulk and the blocking effect due to grain boundaries were determined by impedance spectroscopy and analysed according to the brick layer model. The additional blocking effect is a decreasing function of the grain size but its magnitude reaches a plateau quite insensitive to the grain size below 100 nm. This indicates that the recorded electrical contribution originates from an intrinsic effect. This can be related to a dominant electrical contribution of space charge layers located at the grain boundaries area of nanoscale grain sizes

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“…This dimensionless parameter gives an evaluation of the negative effects of any microstructure defects on the electrical conductivity of the material. It has been applied to characterize pores, local cracks, impurity inclusions and less-conductivity phases originating from phase transitions or impurity precipitation [12][13][14][15][16]. Fig.…”

Section: Electrical Conductivitymentioning

confidence: 99%