SPIN RESONANCE IN NEUTRON-IRRADIATED SINGLE CRYSTALS OF GRAPHITE

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Helvetica Physica Acta (Switzerland)

OSTI ID:4739262

Mueller, K A

An investigation of the conduction carrier spin resonance line of single crystals of graphite irradiated up to doses of 4.9 x 10/sup 19/ nvt thermal neutron flux at room temperature and to 3.9 x 10/sup 20/ nvt at 300 nif- C is discussed in detail. The line shows the characteristic Dysonian shape. The resonance line in polycrystalline samples and single crystals have the same origin. The slight anisotropy of the asymmetry parameter A/B in unirradiated crystals decreases with radiation. The g-value for a magnetic field orientation parallel to the graphite c axis decreases monotonically as a function of the irradiation. The line width is also anisotropic. The intensity of the resonance as a function of room temperature irradiation shows a marked increase. The room temperature trap production was compared to the number of displaced atoms estimated from electron transmission microscopy. Trap annealing was studied with single crystals irradiated at room temperature. Radiation annealing was observed with single crystals irradiated at 300 nif- C. The annealing of the spin resonance line of polycrystalline material irradiated with doses comparable to the critical one is discussed in terms of the present model. (J.S.R.)

• Research Organization: Battelle Memorial Inst., Geneva
• NSA Number: NSA-17-018872
• OSTI ID: 4739262
• Journal Information: Helvetica Physica Acta (Switzerland), Journal Name: Helvetica Physica Acta (Switzerland) Vol. Vol: 35; ISSN HPACA
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

ANISOTROPY
ANNEALING
ATOMS
CRYSTALS
ELECTRON MICROSCOPY
GRAPHITE
IRRADIATION
MAGNETIC FIELDS
METALS, CERAMICS, AND OTHER MATERIALS
MONOCRYSTALS
NEUTRON BEAMS
NEUTRON FLUX
NUCLEAR MAGNETIC RESONANCE
RADIATION DOSES
TEMPERATURE
THERMAL NEUTRONS