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LENGTH AND RESISTIVITY CHANGES OF GERMANIUM UPON LOW TEMPERATURE DEUTERON IRRADIATION AND ANNEALING (thesis). Technical Report No. 14

Technical Report ·
OSTI ID:4317425
Simultaneous measurements of length and resistivity of high-purity germanium single crystals were made upon irradiation and annealing. The specimens were initially irradiated at 25 deg K with deuterons of average energy 10.2 Mev to an integrated flux of 6.2 x 10/sup 16/ specimens were then irradiated at 85 deg K to an additional flux of 9.2 x 10/sup 16/ deuterons/cm/sup 2/ and annealed to 364 deg K. The specific length expansion for both bombardments was found to be DELTA L/L = 1.5 .2 x 10/sup -21/deuterons/cm/sup 2/. The annealing for both runs showed a gradual recovery of the expansion beginning at approximately 200 deg K with recoveries of approximately 50% by 300 deg K and 85% by 360 deg K. An irreversible resistivity increase occurred on annealing between 85 and 140 deg K. The resistivity decreased irreversibly by a factor of 10/sup 3/ between 150 and 200 deg K. The irreversible annealing curves of the resistivity and volume expansion therefore do not show parallel behavior. If the damage is interpreted in terms of point defects, and if the length change recovery is caused by interstitial-vacancy annihilation, then the resistivity changes on annealing below 200 deg K; are possibly caused by the association of defects in various cluster models. A possible cluster model that can explain the present length and resistivity changes on bombardment and annealing, as well as recent small angle x-ray scattering data consists of clusters of interstitials and vacancies not centered at the same point. it is possible that the vacancy and interstitial clusters may be produced directly upon irradiation in a rather coarse distribution suggested by previous small-angle x-ray scattering data at ~ 90 deg K. If so, present displacement theories are in serious error. (auth)
Research Organization:
Illinois. Univ., Urbana
NSA Number:
NSA-12-015953
OSTI ID:
4317425
Report Number(s):
AECU-3808
Country of Publication:
United States
Language:
English

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Related Subjects

ANNEALING
CRYSTALS
DEFECTS
DEUTERONS
ELECTRIC CONDUCTIVITY
GERMANIUM
IRRADIATION
LOW TEMPERATURE
MECHANICAL PROPERTIES
PHYSICS
RADIATION DOSES
RECOVERY
SCATTERING
VOLUME
X RADIATION