On the basis of the theory of crystal growth, as developed by Stranskl and Kalshev and by Kaishev and Bhznakov, calculations have been made for the formation work W,,, of the twodimensional nuclei of metals with cubic, hexagonal and tetragonal lattices It 1s suggested that the preferred orlentatlon
The crystal orientation of electrodeposited metals
β Scribed by N.A. Pangarov
- Publisher
- Elsevier Science
- Year
- 1962
- Tongue
- English
- Weight
- 511 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
Calculations have been made for the work of formation of the two-dimensional nucleus of the metals crystallizing in cubic face-centred and cubic body-centred lattices. It is shown that the crystal orientation of thick deposits depends upon this work. The crystallites of electrodedeposited metal have preferred orientation, when the work of formation of the two-dimensional nucleus for some net plane is smaller than that for the other net planes. It is shown that the crystal orientation depends on the supersaturation, i.e. the overvoltage during the deposition of the metal ions. The results obtained are in very good agreement with the experimental data. Znsammenfassung-Berechnungen sind angestellt worden fur die Bildungsarbeit zweidemensionaler Keime von Metallen, die in kubisch-fl%chenzentrierten und kubisch-raumzentrierten Gittern kristallisieren. Es wird gezeigt, dass die Orientierung der Kristallite dicker Niederschllge von dieser Arbeit abhangig ist. Die Kristallite elektrolytisch abgeschiedener Metalle haben eine bevorzugte Orientierung, wenn die Bildungsarbeit eines zweidimensionalen Keimes einer Netzebene kleiner als diejenige fur die anderen Netzebenen ist. Es wird gezeigt, dass die Orientierung der Kristallite von der Ubersattigung, d.h. von der Uberspannung wlhrend der Abscheidung der Metallionen, ;abhlngig ist. Die erhaltenen Resultate sind in volliger Ubereinstimmung mit den Versuchsergebnissen. R&rne-Evaluation du travail de formation d'un germe bi-dimensionnel de metal cubique a face centrde ou cubique centrb. 11 est montre que l'oriemation cristalline d'electro depositions epaisses depend de ce travail. Les cristallites affectent une orientation privilegiee quand ce travail est nettement inferieur pour un certain plan que pour tout autre plan cristallographique.
L'orientation cristalline depend aussi de la sursaturation, c'est a dire de la surtension propre a 1'6lectrodeposition. Des resultats experimentaux confirment ces previsions theoriques.
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An X-ray diffraction study was made of copper electrodeposited on low index planes of copper single crystals . Three characteristic stages occur during the process : (a) epitaxial growth, (b) twin development, (c) polycrystalline growth . The deposit thickness, Ah, attained just before polycrystall
The work of formation of two-dimensional nuclei with a b.c.c. lattice is theoretically calculated, taking into consideration the forces of interaction of up to fourth neighbours. The work of formation is plotted as a function of supersaturation. The orientation axes of iron electrodeposits have bee
Theoretical calculations for the work of formation of two-dimensional nuclei, Wm,, of the h.c.p. lattice are presented. The dependence of Was on supersaturation is given graphically. The calculations have been proved in the case of cobalt electrodeposition. The polarization curves in the deposition