Collective and Tracer Diffusion via a Defect Cluster in LSGM

Irina V. Belova; Graeme E. Murch; D. Samuelis; Manfred Martin

doi:10.4028/www.scientific.net/DDF.263.81

Paper Titles

Spatially Periodic Formation of Nanoparticles in Metal-Doped Glasses
p.57

Atomic Motion and Diffusion Mechanism of Hydrogen in Amorphous Ceramics of the System Si-B-C-N
p.63

NGR Investigation of Grain-Boundary Diffusion in Poly- and Nanocrystalline Nb
p.69

Interfacial Interaction and Diffusion in Binary Systems
p.75

Collective and Tracer Diffusion via a Defect Cluster in LSGM
p.81

Mechanism and Kinetics of Plasma Nitriding of the Nb-Alloyed PM Tool Steel
p.87

Effect of Fe Addition on Ordering Kinetics in Ni₃Al_1-xFe_x System. Monte Carlo Simulation
p.93

The Thermodynamic Database for the Development of Modern Lead-Free Solders
p.99

Thermodynamic Properties of Liquid Binary Transition-Metal Alloys in the Bretonnet-Silbert Model
p.105

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 263Collective and Tracer Diffusion via a Defect...

Collective and Tracer Diffusion via a Defect Cluster in LSGM

Abstract:

It was recently shown by Schulz and co-workers that in doped lanthanum gallate: La(1-x) SrxGa(1-y)MgyO(3-(x+y)/2) (LSGM) the three cations: La, Sr and Mg have tracer diffusivities that are nearly identical. To explain these findings, a bound defect cluster mechanism containing a cation vacancy from both the A- and the B- sublattices and an anion vacancy was proposed as the principal vehicle for cation diffusion in LSGM. In this paper, implications of this mechanism are considered for the first time. Sum-rule expressions for the collective correlation factors are derived and found to be in excellent agreement with Monte Carlo calculations. Expressions are also developed for the tracer correlation factors of lanthanum and gallium for diffusion via the cluster mechanism and tested by Monte Carlo computer simulation. Good agreement was found. The ratio of the tracer diffusivities of lanthanum and gallium are shown to be consistent with the cluster mechanism.

You might also be interested in these eBooks

Diffusion and Thermodynamics of Materials

View Preview

Info:

Periodical:

Defect and Diffusion Forum (Volume 263)

Pages:

81-86

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.263.81

Citation:

Cite this paper

Online since:

March 2007

Authors:

Irina V. Belova, Graeme E. Murch, D. Samuelis, Manfred Martin

Keywords:

Cluster Mechanism, Diffusion, LSGM, Vacancy

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] O. Schulz and M. Martin: Solid State Ionics, Vol. 135 (2000), p.549.

Google Scholar

[2] O. Schulz, M. Martin, Ch. Argirusis and G. Borchardt: Phys. Chem. Chem. Phys. Vol. 5 (2003), p.2308.

Google Scholar

[3] O. Schulz, S. Flege and M. Martin, Solid Oxide Fuel Cells VIII (SOFC-VIII), Eds. S.C. Singhal and M. Dokiya, Proceedings of the Electrochemical Society, PV 2003-2007 (2003) p.304.

Google Scholar

[4] A.R. Allnatt: J. Phys. C: Solid St. Phys. Vol. 15 (1982), p.5605.

Google Scholar

[5] L.K. Moleko and A.R. Allnatt: Phil. Mag. A 58 (1988), p.677.

Google Scholar

[6] A.R. Allnatt and A.B. Lidiard: Atomic Transport in Solids (Cambridge University Press, Cambridge 1993).

Google Scholar

[7] A.R. Allnatt and E.L. Allnatt: Phil. Mag. A Vol. 49 (1984), p.625.

Google Scholar

[8] G.E. Murch: Diffusion in Crystalline Solids, edited by G.E. Murch and A.S. Nowick, Academic press, Orlando Fl (1984), p.379.

Google Scholar

[9] I.V. Belova and G.E. Murch: Phil. Mag. A Vol. 79 (1999), p.1509.

Google Scholar

[10] J.R. Manning: Phys. Rev. B, Vol. 4 (1971) p.1111.

Google Scholar

[11] H.J. DeBruin and G.E. Murch: Phil. Mag. Vol. 27 (1973), pp.1475-0. 1 1 10 0 wO/wB=100. 0 wO/wB=10. 0 wO/wB=1. 0 wO/wB=0. 1 wO/wA=100. 0 ←2wA/wB wB/(2wA)→ 0 1. 0 wO/wA=10. 0 wO/wA=1. 0 wO/wA=0. 1 DA * /DB.

DOI: 10.7717/peerj.5523/fig-1

Google Scholar