Temperature dependence of the Haven ratio in silver beta-alumina
Conference
·
OSTI ID:6014717
Measurements of Ag diffusivity (D) and ionic conductivity (sigma) have been made on the same single crystals of silver beta-alumina with composition 1.23 Ag/sub 2/0.11 Al/sub 2/O/sub 3/. The D values were obtained from the cation exchange rate of radiotracer /sup 110/Ag in molten AgNO/sub 3/ over 210/sup 0/ C approx. 400/sup 0/C. The sigma measurements were made using an impedance bridge with sputtered silver electrodes at a frequency of 3 x 10/sup 5/ Hz over R.T approx. 450/sup 0/C. Both D and sigma can be expressed in a simple Arrhenius form as: D = 1.47 x 10/sup -4/(cm/sup 2//sec) exp (-4.05(Kcal/mol)/RT); sigmaT = 1.58 x 10/sup 3/(ohm/sup -1/cm/sup -1/K) exp (-3.77(Kcal/mol)/RT). The Haven ratio varies from 0.51 at 200/sup 0/C to 0.56 at 400/sup 0/C. The magnitude of these values is very close to the theoretical value of 0.6 for interstitialcy mechanism. The temperature dependence is strikingly similar to the case of sodium beta-alumina.
- Research Organization:
- Argonne National Lab., IL (USA); IBM Watson Research Center, Yorktown Heights, NY (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6014717
- Report Number(s):
- CONF-790538--17
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
DAYS LIVING RADIOISOTOPES
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMEDIATE MASS NUCLEI
INTERMETALLIC COMPOUNDS
IONIC CONDUCTIVITY
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILVER 110
SILVER COMPOUNDS
SILVER ISOTOPES
SILVER OXIDES
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
DAYS LIVING RADIOISOTOPES
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMEDIATE MASS NUCLEI
INTERMETALLIC COMPOUNDS
IONIC CONDUCTIVITY
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILVER 110
SILVER COMPOUNDS
SILVER ISOTOPES
SILVER OXIDES
TRANSITION ELEMENT COMPOUNDS