Volume and grain boundary diffusion of Hf in polycrystalline Er/sub 2/O/sub 3/

Journal Article · Fri Sep 01 04:00:00 EDT 1978 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1978.tb09346.x· OSTI ID:6556397

Scheidecker, R W; Berard, M F

Hafnium diffusion was measured in polycrystalline Er/sub 2/O/sub 3/ with two impurity levels. A tracer sectioning technique was used and the diffusion coefficients were measured at 1601/sup 0/ to 1970/sup 0/C. Volume diffusion of Hf showed both extrinsic and intrinsic behavior, with the transition temperature increasing with the impurity level present in Er/sub 2/O/sub 3/. The grain boundary diffusion was apparently extrinsic over the entire temperature interval.

• Research Organization: Iowa State Univ., Ames
• OSTI ID: 6556397
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 61:9-10; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
ERBIUM COMPOUNDS
ERBIUM OXIDES
GRAIN BOUNDARIES
HAFNIUM
IMPURITIES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METALS
STABILITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
VOLUME