Size effect of dislocation density in Sb crystals grown by the bridgman method in a hard crucible

Maslova, L. A.; Tsivinsky, S. V.; Aleksandrov, B. N.

doi:10.1002/crat.19730080513

Cited by 5 publications

(2 citation statements)

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“…The equation to estimate the nucleating subgrain sizes (4) can be obtained also in a simpler way, without detailed consideration of low-angle boundary formation as a result of dislocation motion (TSIVINSKY, MASLOVA 1973). Namely, the simple geometric idea is enough that subgrains nucleation is a result of departure of randomly situated dislocations from an area measuring approximately L2 into low-angle boundaries, about 4L long, i.e.…”

Section: Equations To Estimate Minimum Misorientation Subgrain Paramementioning

confidence: 99%

Subgrain structure formation in pure crystals grown from melts

Tsivinsky

Maslova

1980

Cryst Res and Technol

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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

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Section: Equations To Estimate Minimum Misorientation Subgrain Paramementioning

confidence: 99%

Subgrain structure formation in pure crystals grown from melts

Tsivinsky

Maslova

1980

Cryst Res and Technol

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“…All the experiments were carried out with antimony single crystals of the same orientation, grown from a 99.995% pure material. The crystals were grown on a seed in a sectional graphite crucible placed in a 2 x 10-2 Torr vacuum [3]. The as-grown single crystals were of dimensions 8 x 36 x 110 mm3.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of the dislocation drag constant in antimony

Pal‐Val

Platkov

Startsev

1976

Phys. Stat. Sol. (a)

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The over‐damped resonance of dislocation segments is investigated in antimony single crystals in the frequency range 7.5 to 172.5 MHz in order to obtain information on the dislocation drag constant. The dislocation part of the losses is separated by two methods, namely by subtracting the internal friction of a crystal before straining from that of the strained crystal and by calculating the value analytically. The dislocation density is determined by etch pit counting. The data of the two methods show a good agreement. The frequency dependence of the internal friction due to dislocation motion is well described by the frequency profile given by the Granato‐Lücke theory for an exponential length distribution of dislocation loops. The drag constant is obtained and increases from 6 × × 10−5 dyn s/cm2 at 100 K to 9 × 10−5 dyn s/cm2 at 300 K. The results correspond to a theoretical analysis of the dislocation drag near the Debye temperature due to the joint action of the phonon wind and “slow” phonon relaxation. Temperature dependences are obtained for the dislocation segment lengths in the deformed and non‐deformed crystals.

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