The arrangement of low-angle boundaries and the subgrain structure of crystals with high ( 2 106 crn-$) dislocation density are considered. Relations to estimate cross dimensions and misorientations of nucleating subgrains are derived. Production conditions for single crystals without nucleating low-angle boundaries are described and relations to estimate the critical dislocation density, below which subgrain nucleation is highly improbable, are supplied. Macrosubgrain formation mechanisms are described. Growing conditions for crystals free of macrosubgrains are formulated. Equations to estimate their cross dimensions and misorientations are proposed. These are compared with the available experimental data for a variety of materials.PaccMoTpeHa cxeMa pacnonomemm Manoymosbix rpamu, II 6~10q~ofi CTPJ'KTJ'PH KPHC-oqeHKH nonepewbix p a 3~e p o~ II p a a o p~e~~a s~f i 3apom~amlq11xc~ BJIOHOB. Y K~~~H H TaJIJIOB C B61COKOfi ( 2 lo5 CM-') IIJIOTHOCTbH) HHCJIOKaUHfi. QaHbI COOTHOUIeHHR AJIR
A dislocation density dependence on crystal transverse dimensions has been investigated for crystals of Sb grown in split graphite moulds at rates of 1.5; 8.5 and 15 cm/h. The dependence is shown t o be the same for all growth rates which agrees with an earlier suggested theoretical equation.
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B 1-3 paaa. I t is a well known fact that dislocations considerably affect the structure-sensitive properties of crystals. Hence. it is interesting t o st,udy the regularities in the dislocation format>ion when various met'hods of crystal growth from melt' are employed.This survey concerns t.he results obt,ained in this area.
Results of experimental investigations on regularities of the formation of dislocations in crystals of pure antimony during pulling from melts are reported. The mean density of dislocations is compared with the values calculated by different theories.
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