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Sr diffusion in undoped and La-doped SrTiO3 single crystals under oxidizing conditions

Citation

Goemann, K and Borchardt, G and Schulz, M and Goemann, A and Maus-Friedrichs, W and Lesage, B and Kaitasov, O and Hoffmann-Eifert, S and Schneller, T, Sr diffusion in undoped and La-doped SrTiO3 single crystals under oxidizing conditions, Physical Chemistry Chemical Physics, 7, (9) pp. 2053-2060. ISSN 1463-9076 (2005) [Refereed Article]

DOI: doi:10.1039/B418824A

Abstract

Strontium titanate SrTiO3(100), (110), and (111) single crystals, undoped or donor doped with up to 1 at% La, were isothermally equilibrated at temperatures between 1523 and 1773 K in synthetic air followed by two different methods of Sr tracer deposition: ion implantation of 87Sr and chemical solution deposition of a thin 86SrTiO3 layer. Subsequently, the samples were diffusion annealed under the same conditions as before. The initial and final depth profiles were measured by SIMS. For strong La-doping both tracer deposition methods yield similar Sr diffusion coefficients, whereas for weak doping the tracer seems to be immobile in the case of ion implantation. The Sr diffusivity does not depend on the crystal orientation, but shows strong dependency on the dopant concentration supporting the defect chemical model that under oxidizing conditions the donor is compensated by Sr vacancies. A comparison with literature data on Sr vacancy, Ti, and La diffusion in this system confirms the concept that all cations move via Sr vacancies. Cation diffusion is several orders of magnitude slower than oxygen diffusion. © The Owner Societies 2005.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Physical Chemistry (incl. Structural)
Research Field:Transport Properties and Non-Equilibrium Processes
Objective Division:Manufacturing
Objective Group:Ceramics, Glass and Industrial Mineral Products
Objective Field:Ceramics
Author:Goemann, K (Dr Karsten Goemann)
Author:Goemann, A (Dr Anissa Goemann)
ID Code:70165
Year Published:2005
Web of Science® Times Cited:76
Deposited By:Central Science Laboratory
Deposited On:2011-06-06
Last Modified:2011-06-06
Downloads:0

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