NDLI: Impurity diffusion of (141)Pr in LaMnO(3), LaCoO(3) and LaFeO(3) materials.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Palcut, Marián Christensen, Jens S. Wiik, Kjell Grande, Tor
Description	Country affiliation: Norway Author Affiliation: Palcut M ( Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway.)
Abstract	The impurity diffusion of Pr(3+) in dense polycrystalline LaMnO(3), LaCoO(3) and LaFeO(3) was studied at 1373-1673 K in air in order to investigate cation diffusion in these materials. Cation distribution profiles were measured by secondary-ion mass spectrometry and it was found that penetration profiles of Pr(3+) had two distinct regions with different slopes. The first, shallow region was used to evaluate the bulk diffusion coefficients. The activation energies for bulk diffusion of Pr(3+) in LaMnO(3), LaCoO(3) and LaFeO(3) were 126 +/- 6, 334 +/- 68 and 258 +/- 75 kJ mol(-1), respectively, which are significantly lower than previously predicted by atomistic simulations. The bulk diffusion of Pr(3+) in LaMnO(3) was enhanced compared to LaCoO(3) and LaFeO(3) due to higher concentrations of intrinsic point defects in LaMnO(3), especially La site vacancies. Grain-boundary diffusion coefficients of Pr(3+) in LaCoO(3) and LaFeO(3) materials were evaluated according to the Whipple-Le Claire equation. Activation energies for grain-boundary diffusion of Pr(3+) in LaCoO(3) and LaFeO(3) materials were 264 +/- 41 kJ mol(-1) and 290 +/- 36 kJ mol(-1) respectively. Finally, a correlation between activation energies for cation diffusion in bulk and along grain boundaries in pure and substituted LaBO(3) materials (B = Cr, Fe, Co) is discussed.
File Format	HTM / HTML
ISSN	14639076
Issue Number	43
Journal	Physical Chemistry Chemical Physics
Volume Number	10
e-ISSN	14639084
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-11-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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