Abstract
In the new ferroelectric Ba5Ti2O7Cl4 one can observe in the microscope under reflected light black lines that are not domain lines. These lines appear in regular crystallographic directions on a given crystallographic plane. It is shown that such lines are formed by atomic impurities that are not close to each other on atomic scale, and hence do not form a separate phase. The impurities occur close to each other on account of strain energy associated with them. These ordered impurities scatter light and give an optical illusion that the lines form a separate phase in the crystal matrix. When an external dc electric field was applied to the crystal the point defects got scattered in the crystal structure. The possible orientations of domain lines and these linear structures are exactly the same. The two can, however, be distinguished by chemical etching.
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