The influence of alumina on the microstructure and grain boundary conductivity of yttria-doped zirconia

Rizea, A.; Chirlesan, D.; Petot, C.; Petot-Ervas, G.

doi:10.1016/s0167-2738(01)01024-4

Cited by 37 publications

(19 citation statements)

References 11 publications

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“…In previous work [8][9]12] we have found that the bulk conductivity (~b) is similar for all samples.…”

Section: 1a Bulk and Grain Boundary Conductivitiessupporting

confidence: 58%

“…A theoretical analysis by Virkar [5] confirms these results and shows that this two layer composite electrolyte should permit efficient operation of SOFCs at temperatures lower than 750 ~ Recent studies have related the transport properties of YSZ to the sample microstructure [6][7][8][9]. It has been shown that impurities such as Si or A1 segregate at the periphery of the grains leading to the precipitation of glassy phases and to an ionic conductivity restricted to unwetted grain boundaries regions [7,9]. It has also been observed that this effect depends on the sintering temperature and quenching rate [8-I 1].…”

Section: Introductionmentioning

confidence: 82%

“…Two sources of yttrium-doped zirconia powder were used [8,9,12]. The Zc samples were sintered from submicronic 9.9 tool% Y203 doped-zirconia powder supplied by Rhone Poulenc.…”

Section: E X P E R I M E N T a L D E S C R I P T I O Nmentioning

confidence: 99%

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Role of the microstructure on the transport properties of Y-doped zirconia and Gd-doped ceria

Petot-Ervas

Petot

Raulot

et al. 2003

Ionics

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Abstract. Transmission electron microscopy characterizations and XPS analyses have allowed usto show the influence of the microstructure and nanochemistry on the transport properties of Y203-(9 mol%)-stabilized zirconia (YSZ) and Gd203 (10 mol%)-doped ceria (GDC). The grain boundary electrical conductivity (~gb) and oxygen diffusion coefficient (Do) of conventional YSZ ceramics increase with the grain size, while an opposite behavior was found for GDC samples. This difference was attributed to glassy precipitates present at YSZ grain boundaries. Furthermore, it was shown that kinetic demixing processes take place during cooling, at the end of sintering. This causes important changes in the cationic species distribution at interfaces and plays an important role on the transport properties of these two materials.

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“…In previous work [8][9]12] we have found that the bulk conductivity (~b) is similar for all samples.…”

Section: 1a Bulk and Grain Boundary Conductivitiessupporting

confidence: 58%

Section: Introductionmentioning

confidence: 82%

See 1 more Smart Citation

Role of the microstructure on the transport properties of Y-doped zirconia and Gd-doped ceria

Petot-Ervas

Petot

Raulot

et al. 2003

Ionics

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“…In contrast, faster ionic transport was observed along interfaces between two different phases, as for ionic conductors heterogeneously doped with an insulator (e.g. in LiI/Al 2 O 3 or AgCl/Al 2 O 3 [10][11][12][13][14]). The addition of a second phase can Here conductivity values are shown for multilayers with various interfacial densities, i.e.…”

Section: Introductionmentioning

confidence: 99%

Ionic conductivity in oxide heterostructures: the role of interfaces

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

156

120

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Rapidly growing attention is being directed to the investigation of ionic conductivity in oxide film heterostructures. The main reason for this interest arises from interfacial phenomena in these heterostructures and their applications. Recent results revealed that heterophase interfaces have faster ionic conduction pathways than the bulk or homophase interfaces. This finding can open attractive opportunities in the field of micro-ionic devices. The influence of the interfaces on the conduction properties of heterostructures is becoming increasingly important with the miniaturization of solid-state devices, which leads to an enhanced interface density at the expense of the bulk. This review aims to describe the main evidence of interfacial phenomena in ion-conducting film heterostructures, highlighting the fundamental and technological relevance and offering guidelines to understanding the interface conduction mechanisms in these structures.

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“…Many post-densification processes have been applied to improve APS YSZ electrolyte, including acidic phosphate solution sealing [12], nitrate decomposition [11,13], sol immersion [14], laser glazing [15], and spark sintering [16]. At present, many investigations have been carried out to improve the gas permeability and ionic properties of YSZ thin films using alumina addition [2,[17][18][19][20][21]. Initial YSZ powder with 3-4 wt.% of Al 2 O 3 addition allows one to produce SOFC electrolyte layer with higher value of bulk density [20] and with practically no open porosity.…”

Section: Introductionmentioning

confidence: 99%

Improvement of plasma-sprayed YSZ electrolytes for solid oxide fuel cells by alumina addition

Mirahmadi

Pourmalek

2010

Ionics

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Atmospheric plasma spray is a fast and economical process for deposition of yttria-stabilized zirconia (YSZ) electrolyte for solid oxide fuel cells. YSZ powders have been used to prepare plasma-sprayed thin ceramic films on the metallic substrate employing plasma spray technology at atmospheric pressure. Alumina doping was employed to improve the structural characteristics and electrical properties of YSZ. The effect of alumina addition from 1 to 5 wt.% on the properties of plasma-sprayed YSZ films was investigated. It was found that the gas permeability of the Al-doped YSZ electrolyte layer reached a level of 8.6×10 −7 cm 4 gf −1 s −1 , which is a necessary value for the practical operation of solid oxide fuel cells. Alumina doping considerably increased the ionic conductivity of plasma-sprayed YSZ. The open circuit voltage of the alumina-doped YSZ coating was approximately equal to the theoretical value for dense YSZ material.

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The influence of alumina on the microstructure and grain boundary conductivity of yttria-doped zirconia

Cited by 37 publications

References 11 publications

Role of the microstructure on the transport properties of Y-doped zirconia and Gd-doped ceria

Role of the microstructure on the transport properties of Y-doped zirconia and Gd-doped ceria

Ionic conductivity in oxide heterostructures: the role of interfaces

Improvement of plasma-sprayed YSZ electrolytes for solid oxide fuel cells by alumina addition

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