ELECTRON SPIN RESONANCE STUDIES ON RADIATION EFFECTS IN INORGANIC SOLIDS

Journal Article · Sun Jan 01 00:00:00 EST 1961 · Discussions Faraday Soc.

DOI:https://doi.org/10.1039/df9613100140· OSTI ID:4796249

Wertz, J E; Orton, J W; Auzins, P

Defects induced in magnesium oxide by neutron irradiation are largely the result of atom displacements. The vacancies which are left behind are sites at which either electrons or holes may be trapped, depending upon the sign of the displaced ion. Such bound electrons or holes are paramagnetic entities which may give rise to ESR absorption. Thus, negative-ion vacancies in three different environments are trapping sites for electrons, and positive-ion vacancies of two types are trapping sites for holes. These two hole centres are in addition to those types found in crystals which were not neutron-irradiated. Some of these centres may be induced by grinding and x irradiation of MgO or other alkaline earth oxides, sulfides or selenides which have the MgO structure. Mechanical working is believed to distribute negativeion vacancies by dissociation from dislocations which are swept through the crystals. In the neutron-irradiated crystals, there is evidence that some local regions are so disrupted that they rearrange to body-centred instead of face-centred packing. Extended heating largely anneals out the neutron-produced structural defects. One is then enabled to see ESR spectra of defects which are highly sensitive to distortions of cubic symmetry. (auth)

• Research Organization: Univ. of Minnesota, Minneapolis
• NSA Number: NSA-16-013657
• OSTI ID: 4796249
• Journal Information: Discussions Faraday Soc., Vol. Vol: No. 31; Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ABSORPTION
ALKALINE EARTH METALS
ANNEALING
ATOMS
CRYSTALS
DECOMPOSITION
DEFECTS
DEFORMATION
ELECTRIC CHARGES
ELECTRONS
FRANCE
GRINDING
HEATING
HOLES
IONS
IRRADIATION
LATTICES
MAGNESIUM OXIDES
METALLURGY
MOTION
NEUTRON BEAMS
RADIATION EFFECTS
RESONANCE
SELENIDES
SOLIDS
SPIN
SULFIDES
TRAPS
VACANCIES
X RADIATION