A study of natural magnesite-MgO refractory by positron annihilation technique
β Scribed by Zou Liu-Juan; Zhang Cai-Guo; Sun Qin-Ying; Zhu Xiu-Ying
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 156 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0232-1300
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π SIMILAR VOLUMES
Relaxation processes in polyethylene (PE) and polystyrene (PS) were studied by positron annihilation technique. For PE, above the glass transition temperature, T,, the size of free volumes and its concentration were increased by the micro-Brownian motion of molecules. For PS, local motions of molec
## Abstract In the advanced stage of nonβisothermal sintering, vacancy clusters are present as prevailing type of defects. Their concentration considerably decreases at further temperature increase, and it can be concluded that thermally activated conversion of multiple vacancies into climbable dis