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Volume and Grain Boundary Diffusion of Hf in Polycrystalline Er 2 O 3
Author(s) -
SCHEIDECKER R. W.,
BERARD M. F.
Publication year - 1978
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.1151-2916.1978.tb09346.x
Subject(s) - crystallite , impurity , grain boundary diffusion coefficient , diffusion , grain boundary , volume (thermodynamics) , materials science , effective diffusion coefficient , analytical chemistry (journal) , tracer , hafnium , chemistry , condensed matter physics , thermodynamics , metallurgy , microstructure , medicine , zirconium , physics , organic chemistry , radiology , chromatography , nuclear physics , magnetic resonance imaging
Hafnium diffusion was measured in polycrystalline Er 2 O 3 with two impurity levels. A tracer sectioning technique was used and the diffusion coefficients were measured at 1601° to 1970°C. Volume diffusion of Hf showed both extrinsic and intrinsic behavior, with the transition temperature increasing with the impurity level present in Er 2 O 3 . The grain boundary diffusion was apparently extrinsic over the entire temperature interval.