The Landscape of Health Researches in Ilocos Region, Philippines

Cadorna, Edelyn A.; Cadorna, Erwin F.

doi:10.7828/ajoh.v2i1.117

Cited by 3 publications

(4 citation statements)

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“…A high deposition temperature in a chloride bath induced the formation of hcp cobalt, 27 whereas high current densities in the sulfamate bath were found to favor the cubic structure. 28 The transition from b(fcc) to a(hcp)-Co was observed to occur in the pH range of 2.5-3.0. 24 Earlier results suggested that an increase in pH, temperature and current density led to the transformation from fcc-to hcp-cobalt.…”

Section: Xrd Studiesmentioning

confidence: 94%

Characterization and corrosion behavior of Co and Co–P coatings electrodeposited from chloride bath

et al. 2014

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Section: Xrd Studiesmentioning

confidence: 94%

Characterization and corrosion behavior of Co and Co–P coatings electrodeposited from chloride bath

et al. 2014

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“…[1][2][3] A lot of studies have been done on experimental conditions of forming fcc Co in electrodeposition at ambient temperature. These studies show that the formation of fcc Co is favored at lower pH of electrolyte [1,[4][5][6][7] and at higher potentials. [2,8,9] Studies on the mechanism of forming fcc Co in electrodeposition.…”

Section: Introductionmentioning

confidence: 80%

How Deposition Parameters Affect Phase Formation in Metals

Mehmood¹

2016

AJAC

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To understand the mechanism for formation of fcc-cobalt nanowires in electrodeposition, we have systematically studied the effect of deposition potential, pH, and deposition temperature on the formation of fcc Co nanowires by X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). The Co nanowires deposited at the potential of-1.6V are pure hcp phase. When increasing the value of potential to-2.0V, there are hcp Co and fcc Co crystals in the deposited nanowires. The fraction of fcc Co crystals in the nanowires increases with increasing the potential value. At-3.0V, the nanowires are pure fcc Co. The pH of the solution has little effect on formation of fcc Co nanowires. We have also seen that high concentration and low temperature favors fcc phase whereas low concentration and high temperature favors hcp phase. However, at 35°C the co-occurrence of hcp and fcc phases were also observed. These experimental results can be explained by the classical electrochemical nucleation theory. The formation of fcc Co crystals can be attributed to smaller critical clusters formed at a higher potential value since the smaller critical clusters favor formation of fcc nuclei.

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“…An expression for the nuclei density as a function of time is readily obtained assuming the conversion of active sites into nuclei to be a uniform probability process. In other words the nucleation rate is described as an active sites depletion process and given by: [1] where N is the number of nuclei, t is the time, N 0 the saturation nucleus density (number of active sites) and A the nucleation rate constant (nuclei s -1 ). Limiting cases can be found when A is very large (instantaneous nucleation) or small (progressive nucleation).…”

Section: Resultsmentioning

confidence: 99%

“…The electrocrystallization of cobalt has been investigated over quite a long time span, in the attempt to clarify the kinetic behavior during deposition and its relationship with the structure formation mechanism (1)(2)(3)(4)(5)(6). The scope of these studies was also that of achieving an effective control on deposits properties and enlarging the application potential of electrodeposited cobalt.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Electrodeposited Cobalt onto Si/Cu(111) Substrate

Cattaneo¹,

Vicenzo²,

Schäfers³

et al. 2010

ECS Trans.

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The electrochemical nucleation and growth of Co onto (111) textured Cu film on monocrystalline Si was studied. Nucleation experiments were carried out depositing Co from pH 6 sulfamate solutions by standard electrochemical methods. AFM and SEM were used to characterize nuclei distribution and morphology. The nucleation mechanism was qualitatively probed by comparing experimental current transients to theoretical transients according to the Sharifker et Hills model. The type of nucleation mechanism is apparently related to the Co concentration and the overpotential. Increase of either cathodic potential or Co concentration causes a shift from instantaneous to progressive nucleation. The results of the amperometric analysis were not confirmed unequivocally by morphological examination of Co deposits. The mechanism of Co nucleation from simple sulfamate solution on Si/Cu(111) substrate is instantaneous in nature. Highly (00.1) textured Co deposits can be obtained in these conditions, though not necessarily with preservation of the fine columnar microstructure.

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The Landscape of Health Researches in Ilocos Region, Philippines

Cited by 3 publications

References 0 publications

Characterization and corrosion behavior of Co and Co–P coatings electrodeposited from chloride bath

Characterization and corrosion behavior of Co and Co–P coatings electrodeposited from chloride bath

How Deposition Parameters Affect Phase Formation in Metals

Nucleation and Growth of Electrodeposited Cobalt onto Si/Cu(111) Substrate

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