Grain Boundary Diffusion in Ceramics

Atkinson, A.; Monty, C.

doi:10.1007/978-94-009-1035-5_15

Cited by 18 publications

(10 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, the activation energy does not change with the annealing temperature, and is a constant at 0.75eV. The activation energy corresponds well to that of other studies on porous nanocrystalline CeO 2 bulk samples [4], but is typically less than half of that typically reported for dense bulk structures. As can be noted in figure 1, the average grain size and specimen density depend strongly upon the sintering temperature.…”

Section: Methodssupporting

confidence: 87%

Low Temperature Cathode Supported Electrolytes

Anderson¹,

Huebner²,

Kosacki³

2000

View full text Add to dashboard Cite

Section: Methodssupporting

confidence: 87%

Low Temperature Cathode Supported Electrolytes

Anderson¹,

Huebner²,

Kosacki³

2000

View full text Add to dashboard Cite

“…It can be thus said that there is still a discrepancy of a role of grain boundaries for the ionic conductivity of FSZ. However, as is known in a number of metals and ceramics, grain boundaries and surfaces sometimes act as effective diffusion paths, 18) such specific defect structures are considered to contribute to significant increase in the oxygen diffusivity in c-ZrO 2 .…”

Section: Introductionmentioning

confidence: 99%

Effects of Dislocations on the Oxygen Ionic Conduction in Yttria Stabilized Zirconia

et al. 2004

View full text Add to dashboard Cite

Ionic conductivities of yttria-stabilized zirconia (YSZ) single crystals deformed at high-temperature were measured by the AC impedance method. A correlation between ionic conductivity and dislocation structures of deformed YSZ single crystals were investigated. Electrical conductivity measurements of the deformed YSZ crystals were performed for two different current directions of [1 1 10] and [ 1 1 1 11]. The [1 1 10] direction is parallel to edge dislocations introduced by the primary slip system, while the [ 1 1 1 11] direction is normal to the edge dislocation lines. Transmission electron microscopy observations showed that the dislocations due to the primary slip system of (001) [110] were mainly generated at the strain of around 1% strain, while the secondary slip systems, such as (1 1 1 1 1)[101] and (1 1 11)[011], were also activated at about 10% strain. It was found that the deformed samples with larger strains exhibited higher electrical conductivities irrespective of the measured current directions. However, the electrical conductivity along [ 1 1 1 11] was higher than that along [1 1 10], suggesting that mobility of oxygen ion is sensitive to the dislocation structures. From the activation energy for oxygen diffusion in the deformed samples, it was found that the oxygen migration enthalpy for deformed samples became smaller than that for undeformed samples, whereas the association enthalpy for the deformed samples became larger. The increase in the association enthalpy might be due to interaction between oxygen vacancies and dislocations. It is thus considered that oxygen vacancies concentrate around dislocations, and are able to move very quickly along the dislocation lines.

show abstract

“…GB diffusivities in A1203 (see summaries in Refs. [73,74,75,76]) are scattered over almost 10 orders of magnitude, with oxygen diffusion being the slowest and Ag diffusion being the fastest. Similarly, GB diffusivities in MgO are scattered over 8-9 orders of magnitude, with oxygen diffusion being the slowest and Cr diffusion being the fastest.…”

Section: Grain Boundary Diffusion In Ionic Solidsmentioning

confidence: 98%

“…Recent comprehensive reviews on this topic were given in Refs. [72,73,74,75,76]. In this paper we will focus the discussion on oxide systems, particularly stoichiometric oxides such as A1203 and MgO, and nonstoichiometric oxides such as NiO.…”

Section: Grain Boundary Diffusion In Ionic Solidsmentioning

confidence: 99%

See 1 more Smart Citation

Grain boundary diffusion metals versus non-stoichiometric compounds

Gust

2001

Ionics

View full text Add to dashboard Cite

Abstract. This paper compares the current knowledge of grain boundary diffusion in three classes of materials: metals and metallic alloys, ordered intermetallic compounds, and ionic stoichiometric and non-stoichiometric compounds. Along with fundamentals, the recent progress in grain boundary diffusion studies in these materials is reviewed. The differences and common features of grain boundary diffusion in these materials are pointed out, and the origin of the differences is examined. It is concluded that, despite many differences, the basic features of grain boundary diffusion in metals, intermetallics and ionics are fairly similar. Those basic features are discussed through the paper, and some prospective topics of future research in the area are suggested.

show abstract

Grain Boundary Diffusion in Ceramics

Cited by 18 publications

References 28 publications

Low Temperature Cathode Supported Electrolytes

Low Temperature Cathode Supported Electrolytes

Effects of Dislocations on the Oxygen Ionic Conduction in Yttria Stabilized Zirconia

Grain boundary diffusion metals versus non-stoichiometric compounds

Contact Info

Product

Resources

About