Self-diffusion of Er in pure and HfO/sub 2/-doped polycrystalline Er/sub 2/O/sub 3/

Conference · Sat Sep 01 04:00:00 EDT 1979 · J. Am. Ceram. Soc.; (United States)

OSTI ID:5643345

Scheidecker, R W; Berard, M F

Using a tracer sectioning technique, the self-diffusion of Er in pure and HfO/sub 2/-doped polycrystalline Er/sub 2/O/sub 3/ was measured at 1614 to 1900/sup 0/C. Up to approx. = 10 mol % HfO/sub 2/ dopant level, the Er self-diffusion coefficients followed a relation based on cation vacancies as the principal mobile defects present and available for cation diffusion. Above 10 mol % HfO/sub 2/, deviation from this relation occurred, apparently due to clustering of cation vacancies and oxygen interstitials around the dopant hafnium ions. The activation energy for the self-diffusion of Er in pure Er/sub 2/O/sub 3/ was 82.2 kcal/mol and increased with the HfO/sub 2/ dopant level present.

• Research Organization: Iows State Univ., Ames
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5643345
• Conference Information: Journal Name: J. Am. Ceram. Soc.; (United States) Journal Volume: 62:9-10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL COMPOSITION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFECTS
DENSITY
DIFFUSION
DOPED MATERIALS
ELEMENTS
ERBIUM
ERBIUM COMPOUNDS
ERBIUM OXIDES
FABRICATION
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
INTERSTITIALS
IONS
MATERIALS
METALS
MOBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
RARE EARTH COMPOUNDS
RARE EARTHS
SELF-DIFFUSION
SINTERING
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VACANCIES