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Abstract
The formation of microtubes (MTs) with rectangular cross section in the volume of CdI2 layered crystals doped with Bi3+ trivalent impurity ions has been observed for the first time by scanning electron microscopy. The MTs grow predominantly in pores that appear in the volume of CdI2-BiI3 crystals as a result of a difference in the valence of host Cd2+ ions and guest Bi3+ ions substituted into regular crystal lattice sites. The formation of MT structures is related to the rolling of I-Cd-I trilayers containing impurity ions, which takes place as a result of the presence of uncompensated charges at the edges. Deviation of the MT cross section from circular is explained by nonuniformity of the elastic properties of I-Cd-I trilayers with Bi impurity, which is related to the appearance of vacancies in the cation subsystem upon replacement of Cd2+ ions by Bi3+ ions.
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