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Titolo:
Growth velocity and the topography of Ni-Zn binary alloy electrodeposits
Autore:
Hiane, M; Ebothe, J;
Indirizzi:
Univ Reims, UFR Sci Exactes, Unite Therm & Anal Phys, LMET,UPRES EA 2061, F-51685 Reims 02, France Univ Reims Reims France 02 LMET,UPRES EA 2061, F-51685 Reims 02, France
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL B
fascicolo: 4, volume: 22, anno: 2001,
pagine: 485 - 495
SICI:
1434-6028(200108)22:4<485:GVATTO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCANNING TUNNELING MICROSCOPY; AFFINE FRACTAL ROUGHNESS; ATOMIC-FORCE MICROSCOPY; SURFACE-DIFFUSION; ZINC; COATINGS; MORPHOLOGY; INTERFACES; DEPOSITION; KINETICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Hiane, M Univ Reims, UFR Sci Exactes, Unite Therm & Anal Phys, LMET,UPRES EA 2061, BP 138,21 Rue Clement Ader, F-51685 Reims 02, France Univ Reims BP138,21 Rue Clement Ader Reims France 02 02, France
Citazione:
M. Hiane e J. Ebothe, "Growth velocity and the topography of Ni-Zn binary alloy electrodeposits", EUR PHY J B, 22(4), 2001, pp. 485-495

Abstract

We show that the electrodeposition of Ni-Zn alloys at the lowest growth velocities, upsilon < 0.5 mum/s, exclusively proceeds from an abnormal co-deposition phenomenon. The growth process in this upsilon region greatly depends on the initial [Co2+] concentration of the film deposition bath. A theoretical approach of this process including the role of the saturation surface roughness of the alloy, o(sat), leads to an estimation of the transport properties of the ad-atoms involved during the deposit formation. Their surface diffusion coefficient varying between 1.76 x 10(-10) and 2.40 x 10(-8) cm(-2)/s exhibits a minimal value, D-s = 2.10 x 10(-10) cm(-2)/s located between upsilon = 0.17 and 0.35 mum/s. The spatial scaling analysis of the local roughness., c,, examined according to the power-law sigma = L-alpha reveals that the resulting roughness exponents concurs with the Kardar-Parisi-Zhang dynamics including the restricted surface diffusion. Two main v regions leads to different fractal textural features of the alloy film surface. Below 0.10 mum/s, the roughness exponent obtained is alpha approximate to 0.6, depicting a limited ad-atom mobility. Over upsilon = 0.30 mum/s, this exponent stabilises at alpha approximate to 0.82, indicating an increase of the surface diffusion.

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Documento generato il 29/09/20 alle ore 00:40:17