Electrical properties of YSZ and CaSZ single crystals

Kazlauskas, Saulius; Kežionis, A.; Салкус, Т.; Орлюкас, А.Ф.

doi:10.1016/j.ssi.2012.10.020

Cited by 33 publications

(15 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many data sets, especially for compositions that exhibit high oxide ion conductivity, show distinct curvature of the Arrhenius plots which is attributed to the trapping at lower temperatures of mobile oxide ion vacancies in vacancydopant defect complexes. 3,[7][8][9][10] Two possible defect complexes that are widely discussed are the charged dimer, (Y Zr V…”

mentioning

confidence: 99%

“…The Arrhenius plot for σ t , (b), is not linear, consistent with that reported for various YSZ samples on many other occasions. 3,7,8,10,28,29 This non-linearity is widely attributed to trapping of oxygen vacancies in vacancy-dopant complexes at low temperatures: 30 at higher temperatures, dissociation of the complexes occurs and the trapping enthalpy is not included in the activation energy. The total conductivity, σ t , at high temperatures, would therefore represent the hopping of free vacancies.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Electrical Properties of Yttria-Stabilized Zirconia, YSZ Single Crystal: Local AC and Long Range DC Conduction

Vendrell

West

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

Widely-used complex plane analysis of impedance data is insufficiently sensitive to characterize fully the bulk properties of YSZ single crystal. Instead, more extensive data analysis is needed which uses a combination of parallel, admittance-based formalisms and series, impedance-based formalisms. Bulk electrical properties are measured at higher frequencies and contain contributions from both long range conduction and local dielectric relaxation. At lower frequencies, electrode-sample contact impedances are measured and are included in full equivalent circuit analysis. The impedance of YSZ crystal of composition 8 mol% Y 2 O 3 in the (110) orientation, with Pt electrodes, was measured over the temperature range 150-750 • C and frequency range 0.01 Hz-3 MHz. Full data analysis required (i) a parallel constant phase element (CPE)-resistance (R) combination to model the electrode response, (ii) a series R-C element to represent local reorientation of defect dipoles and (iii) a R-C-CPE element to represent long range oxide-ion conduction; (ii) and (iii) together model the bulk response. The dielectric element underpins all discussions about defect structure and properties of YSZ but has not been included previously in analysis of impedance data. The new equivalent circuit that is proposed should allow better separation of bulk and grain boundary impedances of YSZ ceramics. Yttria-stabilized zirconia (YSZ) is a very well-known oxide ion conductor that is used as the solid electrolyte in solid oxide fuel cells and oxygen gas sensors.1-3 It usually takes the form of a high-density ceramic in which the bulk resistance in series with a grain boundary resistance gives the overall sample resistance. 4 In almost all cases, the grain boundary resistance is present and cannot be eliminated readily by attention to ceramic processing conditions. The nature of the grain boundary impedance is often unclear, although significant compositional differences from the bulk, associated with dopant segregation, may be involved. 5,6 In order to measure sample impedances, sample-electrode contacts are necessary and therefore, appropriate consideration of their associated impedances forms part of the overall impedance analysis. For YSZ, contact impedances include contributions from the blocking of oxide ions at the sample-electrode interface, charge transfer resistances associated with the O 2− /O 2 redox couple and the diffusion of O 2 molecules between the surrounding atmosphere and the sampleelectrode interface. Usually, electrode contact impedances are wellseparated on a frequency scale from bulk/grain boundary impedances because they have much higher associated capacitances, C: typically (1-10) × 10 −6 F for the electrode contact compared with ∼ 1 × 10 −10 F for a grain boundary capacitance and (2-3) × 10 −12 F for a bulk capacitance. Relaxation frequencies, ω, are given ideally by ωτ = 1, where τ = RC and therefore, the frequency maxima of impedance semicircles, arcs or peaks associated with bulk/grain boundary impedances are usuall...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Electrical Properties of Yttria-Stabilized Zirconia, YSZ Single Crystal: Local AC and Long Range DC Conduction

Vendrell

West

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The fitted values of the parameters of the equivalent circuit were used to calculate DRT in the grain interior and grain boundaries of 950°C sintered ceramics. It was supposed that impedance spectrum e ρ ω ð Þ ¼ ρ 0 ω ð Þ−iρ″ ω ð Þ can be represented as a sum of elements with individual relaxation times [25]:…”

Section: Resultsmentioning

confidence: 99%

“…(1) using the regularization methods [25,26]. The charge relaxation occurs with the continuous set of relaxation times with different probabilities so DRT represents the probability The relaxation in grain interior is represented by the peak of distribution of shorter relaxation times followed by a peak of grain boundary relaxations.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Na1.3Al0.3Zr1.7(PO4)3 solid electrolyte ceramics by impedance spectroscopy

et al. 2015

View full text Add to dashboard Cite

“…The dispersion in electrical properties was assigned to charge carrier relaxation and fitted to an approximately Gaussian distribution of relaxation times (17) . Single crystals of YSZ9 showed dispersions in permittivity, from which tan peaks were extracted and attributed to defect associates involving substitutional Y and oxygen vacancies (18) .…”

Section: Introductionmentioning

confidence: 99%

Dipolar relaxation and impedance of an yttria-stabilised zirconia ceramic electrolyte

Hernández

West

2016

J. Mater. Chem. A

View full text Add to dashboard Cite

show abstract

Electrical properties of YSZ and CaSZ single crystals

Cited by 33 publications

References 17 publications

Electrical Properties of Yttria-Stabilized Zirconia, YSZ Single Crystal: Local AC and Long Range DC Conduction

Electrical Properties of Yttria-Stabilized Zirconia, YSZ Single Crystal: Local AC and Long Range DC Conduction

Characterization of Na1.3Al0.3Zr1.7(PO4)3 solid electrolyte ceramics by impedance spectroscopy

Dipolar relaxation and impedance of an yttria-stabilised zirconia ceramic electrolyte

Contact Info

Product

Resources

About