Abstract
Cation vacancies profoundly affect the observable electronic properties of alkaline-earth oxides. Their presence serves to compensate the charge of inevitable trivalent ions with which they tend to be associated in a 1:1 or 1:2 ratio. Isolated cation vacancies ordinarily constitute less than 10 percent of the total number. However, neutron irradiation of samples kept at room temperature leads to large numbers of isolated cation vacancies and of anion vacancies. One or two positive holes may be trapped by the former to give the V and the VO centers, respectively. V-centers at room temperature show a single isotropic ESR line which is the result of rapid migration of the hole among the six equivalent oxygen ions. Association of a trivalent ion with a cation vacancy prevents such reorientation. Anion vacancies trap one or two electrons to form F+ or FO centers, respectively.
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Wertz, J.E. (1974). Vacancy-Related Defects in the Alkaline-Earth Oxides. In: Seltzer, M.S., Jaffee, R.I. (eds) Defects and Transport in Oxides. Battelle Institute Materials Science Colloquia. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8723-1_11
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