Abstract
The search of the off-centre displacement of an impourity iron from the crystal lattice site in the ground electronic state has been performed by the ionic thermocurrent (ITC) method for Ga+, Ge2+ v− c, and Sn2+ v− c centres in some alkali halides. No ITC peak has been found at T>5 K for Ga+ ions. One ITC peak at the temperatures 187–214 K has been observed for Ge2+ v− c and Sn2+ v− c centres. It has been concluded that due to the presence of a cation vacancy v− c near a Ge2+ ion, the latter is shifted towards v− c. As a result, only one off-centre position of the Ge2+ ion with a deep potential minimum is possible. The reorientations of the off-centre Ge2+ ion can occur only due to v− c jumps around Ge2+ at the temperatures near 200 K where reorientations of Ge2+ v− c dipoles become possible. The same may also be true for Sn2+ v− c centres. The position of v− c with respect to Ge2+ and Sn2+ ions in potassium halide is discussed.
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