Abstract
The deformation behavior of Tl3AsSe3 (TAS) single crystals has been studied by hardness tests in four different crystal surfaces, the (10$\overline 1$0), (1$\overline 2$10), (0001), and the plane where the normal is tilted 19° off the hexagonal c axis in the b–c plane. The dominant slip planes are of the (10$\overline 1$1) type; the possibility of (10$\overline 1$0) and (0001) slip was also observed. The observed dependence of force on the length of diamond pyramid indentations implies that TAS behaves to some degree like a ductile metal. Measurements of hardness anisotropy are very useful for defining crystal growth and handling conditions that minimize the effect of stresses. X-ray topographs of Knoop hardness indentations indicate that the measured x-ray diffraction contrast is closely related to the rotational component of each individual slip system activated by the hardness indentation.
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