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Grain Boundary Diffusion of Magnesium in Zirconia
Author(s) -
Bak Tadeusz,
Nowotny Janusz,
Prince Kathryn,
Rekas Mieczyslaw,
Sorrell Charles C.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00442.x
Subject(s) - grain boundary diffusion coefficient , effective diffusion coefficient , diffusion , grain boundary , analytical chemistry (journal) , atmospheric temperature range , materials science , cubic zirconia , yttria stabilized zirconia , activation energy , magnesium , chemistry , mineralogy , ceramic , thermodynamics , metallurgy , microstructure , chromatography , medicine , physics , magnetic resonance imaging , radiology
This paper reports the transport kinetics of Mg in cubic yttria‐stabilized zirconia (containing 10% mol of Y 2 O 3 (10YSZ)) involving the bulk and the grain boundary diffusion coefficients. The diffusion‐controlled concentration profiles of Mg were determined using secondary ion mass spectrometry (SIMS) in the range 1073–1273 K. The determined bulk diffusion coefficient and the grain boundary diffusion product may be expressed as the following functions of temperature, respectively: D = 5.7 exp[(−390 kJ/mol)/ RT ] cm 2 ·s −1 and D ′αδ= 3.2 × 10 −15 exp[(−121 kJ/mol)/ RT ] cm 3 ·s −1 , where α is the segregation enrichment factor and δ is the boundary layer thickness. The grain boundary enhancement factor decreases with temperature from 10 5 at 1073 K to 10 3 at 1273 K.