SOLID STATE DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING AUGUST 31, 1957
Two experiments on the precipitation-hardening reaction in Ni--Be were completed The removal rate of conduction electrons in n-type Ge is increased during fast neutron irradiation at 16 deg K over that previously observed at -- 100 deg K. The dependence of hole lifetime in n-type Ge on irradiation was determined. The Hall mobility of fastneutron- and gamma -irradiated single- crystal plates of n-type Ge was determined from room temperature to --50 deg K for a series of irradiations. A theoretical expression was obtained for the bulk absorption coefficient of Ge for light in the near-infrared region. Total-energy diagrams are presented for several substitutional impurities in Ge. A strong paramagnetic contribution to the susceptibility is evident at low temperatures in Si samples having between 5 x 10/sup 16/ and 4 x 10/sup 18/ As donors/cc. The temperature dependence of the magnetic suscepiibility of pure Mo wire was measured. A liquid He cryostat was put into operation to permit naeasurement of magnetic susceptibility over the range 3 to 350 deg K. The hyperfine interaction of one of the magnetic defects in the quartz system with the 4.7%-abundant Si/sup 29/ isotope (nuclear spin I = 1/2) was observed. A superheterodyne spectrometer was constructed which has a sensitivity approximately 100 times greater than that of the old system for similar operating conditions. Optical studies of crystalline quartz after Co/sup 60/ gamma irradiation indicate little if any formation of the 2150-A C band observed after neutron bombardment. The effects of fast pile neutrons upon solid crystalline structures were observed by use of x- raydiffraction techniques. It was observed in high-purity KC1 crystals that the scattering of phonons by strains introduced by cleaving may be considerable and that thermal annealing is effective in removing such thermal resistance. The thermal conductivity of the purest available crystals of KC1, SiO/sub 2/, LiF, CaF/sub 2/, MgO, Ge, and NaF was measured at low temperatures. The thermal conductivity of fused silica at low temperatures increases by a factor of 2 after an irradiation of 5.8 x 10/sup 19/ fast neutrons/cm/sup 2/, the increase being approximately linear with dose. Changes in density and in thermal conductivity were measured for ceramic materials irradiated for several operating cycles in the MTR. Spectral measurements were made on polyethylene terephthalate before and after irradiation. Samples of polymethyl methacrylate of various average molecular weights were irradiated and the molecular weights after irradiation were determined by measuring the viscosities of dilute solutions of the polymer. The radiation resistance of fluorobutyl acrylate was investigated by the usual engineering properties tests. The physical and nuclear properties of the U- bearing zeolites are presented. Postirradiation examinations were completed on two fuels, ThO/sub 2/--U0/sub 2/ and SiC --Si-- U0/sub 2/. (For preceding period see ORNL-2188.) (M.H.R.)
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- NSA Number:
- NSA-12-002964
- OSTI ID:
- 4348167
- Report Number(s):
- ORNL-2413
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
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