Densification of Yttria‐Stabilized Zirconia: Impedance Spectroscopy Analysis

Steil, M.C.; Thévenot, F.; Kleitz, M.

doi:10.1149/1.1837416

Cited by 180 publications

(121 citation statements)

References 3 publications

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“…The dielectric constants of the bulk (e b ) calculated from the bulk capacitances (C b = e 0 e b A/L) of the samples are in the range of about 54 to 57, irrespective of different yttrium and aluminium concentrations, suggesting that the dielectric constant is quite concentration insensitive. This is in good agreement with the work by Kleitz and coworkers [14,15], in which the dielectric constant of Y 2 O 3 doped ZrO 2 was found to be about 60, being independent of Y 2 O 3 content. However, lower values ($ 30 to 40) for e b were also reported [16][17][18], the cause for this difference may be the different phys.…”

Section: Resultssupporting

confidence: 93%

Defect Structure Modification in Zirconia by Alumina

Guo

2001

phys. stat. sol. (a)

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To high purity 8 mol% Y 2 O 3 doped ZrO 2 , 0-0.6 mol% Al 2 O 3 were added. The microstructures were characterized by SEM, and the electrical properties were measured by impedance spectroscopy. The bulk resistivity increases with increasing Al 2 O 3 content, the grain boundary resistivity and the grain boundary thickness also increase with increasing Al 2 O 3 content, which is mainly due to the decreasing concentrations of free oxygen vacancies in the bulk and at the grain boundaries as a result of the Al 2 O 3 addition. Possible concentration variations of the other defects, e.g. Y 0Zr ,Zr Þ x in the bulk and at the grain boundaries are also suggested.

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Section: Resultssupporting

confidence: 93%

Defect Structure Modification in Zirconia by Alumina

Guo

2001

phys. stat. sol. (a)

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“…Figure 10 shows the variation of relative density of fibers with heat treatment temperature. The relative density of the fibers was as high as 74% just after the drying at 373 K. The relative density increases gradually up to 1273 K, above which it increases abruptly and reaches 97% at 1473 K. This densification behavior of 4 mol % YSZ fibers found in this study coincides with that of 8 mol % YSZ bulk reported by M. C. Stein et al 20) In case of ordinary YSZ bulk sintered body, it has been reported the relative density reaches 95% or more after sintering at 16731773 K for 24 h. In the present study, YSZ fiber with high density is obtained at lower temperatures by 773 K than that of YSZ bulk sintered body. The small particle size of the initial zirconia as well as the unique microstructure of the as-prepared fibers in which the monodispersed zirconia particles are closely packed by self-assembly are considered to be the reason.…”

Section: Microstructures Of Ysz Fiberssupporting

confidence: 90%

Preparation of yttria-stabilized zirconia fibers from a zirconia sol and their properties

Shida

Ohara

Matsuda

et al. 2012

J. Ceram. Soc. Japan

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Yttria-stabilized zirconia (YSZ) fibers various widths ranging from 36 to 66¯m of width were prepared by a drying process at 363 K from a zirconia sol containing 4 mol % yttria with 40 nm of primary particle size. The effects of preparation method on the crystal phase, microstructure and electrical properties of the obtained YSZ fibers were investigated. The obtained fibers were heat-treated at 1473 K for 1 h. The grain size and relative density of the fiber were 126 nm and 97%, respectively. The oxygen ion conductivity of the fiber showed heat-treated at 1473 K is 0.18 S/cm at 1273 K, which is the same as 8 YSZ bulk ceramics.

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“…Studies have found the porosity of the electrolyte effects gas transport to the triple phase boundary (TPB) [3,7]. The TPB is the location where the electrolyte, electrode, and gas phase are in contact.…”

Section: Morphology and Microstructurementioning

confidence: 99%

Managing H2O Cross‐Sensitivity Using Composite Electrolyte NOx Sensors

Murray¹,

Kharashi²,

Adedeji³

2017

Electrochemical Sensors Technology

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NO x sensors composed of partially stabilized zirconia (PSZ), fully stabilized zirconia (FSZ), and PSZ-FSZ composite electrolytes were investigated using impedance spectroscopy under dry and humidified gas conditions. The impedance data were used to interpret the electrochemical behavior of the various sensors as the water concentration in the gas stream varied. The sensors were operated in the presence of 0-100 ppm NO with 1-18% O 2 and 3-10% H 2 O with N 2 as the balance gas. The operating temperature of the sensors ranged from 600 to 700 C. The impedance response for sensors containing ≥ 50 vol% PSZ slightly decreased under humidified gas conditions, in comparison to dry gas conditions; whereas, a significant increase in impedance occurred for sensor largely containing FSZ. This indicated water cross-sensitivity was substantial at FSZbased sensors. The microstructural properties, NO x sensitivity, oxygen partial pressure and temperature dependence, as well as the response time of the sensors composed of the various electrolytes were characterized in order to interpret the electrochemical response with respect to water cross-sensitivity. Analysis of the data indicated that sensors composed of a PSZ-FSZ composite electrolyte with 50 vol% PSZ were more suitable for detecting NO x while limiting water cross-sensitivity.

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Densification of Yttria‐Stabilized Zirconia: Impedance Spectroscopy Analysis

Cited by 180 publications

References 3 publications

Defect Structure Modification in Zirconia by Alumina

Defect Structure Modification in Zirconia by Alumina

Preparation of yttria-stabilized zirconia fibers from a zirconia sol and their properties

Managing H2O Cross‐Sensitivity Using Composite Electrolyte NOx Sensors

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