Effect of sintering atmospheres on the sintering of uranium dioxide
Technical Report
·
OSTI ID:4934724
Sintering of UO/sub 2/ powder compacts pressed at 20,000 psi in different atmospheres was investigated. The effect of 0/U ratio on sintering in nitrogen and in air was investigated; usually, an increased initial densification with increase of O/U ratio was noted. Sintering in hydrogen, nitrogen; and air was more effective at higher sintering temperatures. Only hydrogen sintering resulted in geometrically sound pellets. Densities in excess of 94% theoretical could be obtained at temperatures as low as 1300 deg C in hydrogen, indicating the activity of UO/sub 2/ powder used. (auth) to characterize the renormalization over a wide range of temperature and over wave vectors extending throughout the Brillouin zone. Since EuO is a nearly ideal Heisenberg ferromagnet, such measurements provide a direct test of spin-wave theory at higher temperatures. Specifically, the data are compared with predictions of renormalization effects arising from two-magnon dynamical interactions. As expected, this description of the renormalization is found to be somewhat better for large q than for small-q magnons. (auth)
- Research Organization:
- Atomic Energy Establishment, Cairo (Egypt)
- Sponsoring Organization:
- Sponsor not identified
- NSA Number:
- NSA-29-008185
- OSTI ID:
- 4934724
- Report Number(s):
- AREAEE--163
- Country of Publication:
- Egypt
- Language:
- English
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