ISSN:
1573-9171
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Conclusions 1. Thermal and radiational processes in single crystals of magnesium oxide with varying concentrations of OH− ion impurities and cationic impurities were studied by IR and EPR spectroscopy. 2. The protons of the Mg(OH)2 microphase were thermally the most mobile in hydroxyl-containing single crystals of MgO. The reciprocal redistribution of protons between the microphase and interstices began at 400°K. The region of migration of cationic vacancies (700–900°K) was another region of proton mobility. 3. Radiational processes in hydroxyl-containing single crystals of MgO can be divided into three successive stages: A VOH center is formed with small absorbed doses, and diffusion of a proton from the VOH center with formation of a V(OH)2 center and interstitial protons is observed on further irradiation. With doses above 100 Mrad, the Mg(OH)2 microphase is formed due to the V(OH)2 center and Hi +. The direction and rate of the processes of hydrogen redistribution are a function of the concentration of cationic impurities, the concentration of OH− ions, the dose absorbed, and the irradiation temperature.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00954642
