EFFECTS OF VARIABLE MICROACCELERATIONS IN DISTRIBUTION OF IMPURITY INHOMOGENEITIES IN THE InSb:Te SINGLE CRYSTALS GROWN BY CRUCIBLELESS FLOATING ZONE MELTING ON THE 'FOTON' SATELLITE

摘要

The contemporary data on low-frequency micro-accelerations, that are typical for all satellites of a "Foton" series, are compared with the peculiarities of impurity inhomogeneity distributions revealed in Te-doped indium antimonide single crystal (InSb:Te), grown by floating zone melting technique during the "Foton-3" flight mission. Within a complicated structure of these inhomogeneities (as a shape and position of the impurity core as the striations) a lot of periodicity is occurred. The frequencies of this periodicity are detected by a method of spectral image analysis of the numeric coding photos of a central longitudinal section of the investigated crystal. These frequencies coincide with those detected in micro-accelerations in a range of 0-0.005 Hz measured on the recent "Fotons". It testifies that the reasons of origin of indicated periodicity were quasi-stationary micro-accelerations onboard the satellite, and confirms developed representations how the small forces of gravity and inertial nature influence convective heat/mass transfer in melts and, as a result, the segregation processes during crystal growth by directional crystallization methods.