Sorption of cesium by graphites as a function of strontium and barium concentration at high temperatures. Progress report, February, 1, 1975--January 31, 1976
Cesium desorption isotherms on H-451 graphite were obtained at 800, 900, 1000, and 1100$sup 0$C. Hysteresis was observed at cesium vapor pressures below 5 x 10$sup -6$ atm on the 1000$sup 0$C isotherm. A cesium background experiment indicated that the sorption tube background contribution is not a major factor in assessing the cesium behavior within the higher vapor pressure range. One strontium desorption experiment was conducted, using H-451 graphite impregnated to 2.28 $mu$moles Sr/g C. Two sorption experiments on strontium impregnated H-451 graphite (approximately 5 and approximately 1 $mu$mole/g) are about to begin. From the preliminary analysis of the kinetic behavior, it is concluded that the lengthy times required for the graphite sample to equilibrate (3 to 12 days) is determined by the diffusion of cesium atoms from graphite pore surfaces into the graphite grains. One sorption sample was radially profiled upon completion of a 1000$sup 0$C sorption experiment, and this profile was analyzed. Concentration- dependent strontium diffusion studies on H-451 graphite have also begun at 1600$sup 0$K, with an initial uniform strontium concentration of 10 $mu$g Sr/g C in the first experiment. Electron microprobe qualitative analyses are being conducted on H-451 graphite samples.
- Research Organization:
- North Carolina State Univ., Raleigh (USA)
- NSA Number:
- NSA-33-023821
- OSTI ID:
- 4058766
- Report Number(s):
- ORO--4682-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*CESIUM-- ADSORPTION
*GRAPHITE-- SORPTIVE PROPERTIES
*STRONTIUM-- DIFFUSION
360603* --Materials--Other Materials--Properties
DESORPTION
IMPREGNATION
KINETICS
N50330* --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
RESEARCH PROGRAMS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
*GRAPHITE-- SORPTIVE PROPERTIES
*STRONTIUM-- DIFFUSION
360603* --Materials--Other Materials--Properties
DESORPTION
IMPREGNATION
KINETICS
N50330* --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
RESEARCH PROGRAMS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE