Paramagnetic Hole Centers in CeO2.

Ft. Belvoir Defense Technical Information Center FEB 1972.

40 p.

APPROVED FOR PUBLIC RELEASE.

The ESR spectra of three hole centers have been observed in nominally pure crystals of CeO2 following UV irradiation at 77K. Designated VI, VII, and VIII, the centers exhibit orthorhombic symmetry with principal axes (x, y, z) parallel to (110), (001), and (1,-1,0) respectively. The g-values are: g sub x(I)= 2.0311, g sub y(I) = 2.0065, g sub z(I) 2.0330; g sub x(II) = 2.0175; g sub y(II) - 2.0054, g sub z(II) = 2.0317; and g sub x(III) = 2.0268, g sub y(III) = 2.0050, g sub z(III) = 2.0415. The VIII center exhibits a hyperfine interaction with a nuclear spin I = 1/2 for which A(x) = 3.1, A(y) = 2.3, and A(z) = 2.7 in units of 0.0001/cm. The thermal bleaching of the centers has been correlated with the thermoluminescence of the same crystals measured by Land and Rodine. Models for these centers are proposed which involve an O2(3- ) molecular ion near a stabilizing impurity ion. (Author).

English

January 27, 2011