Electrocrystallization of magnetic Co–W–Mn films

Orlovskaja, L.; Matulionis, E.; Timinskas, A.; Šukien, V

doi:10.1016/s0257-8972(00)00730-1

Cited by 15 publications

(19 citation statements)

References 9 publications

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“…It is interesting to note that the W 4f 7/2 peaks around 30.0 eV for the CoeWeP/g-Al 2 O 3 catalysts can also be observed in the appearance of a shoulder in the low energy side of the valence band. This has been observed in other reports [37,38]. Fig.…”

Section: Resultssupporting

confidence: 87%

Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Wang

Liu

et al. 2015

International Journal of Hydrogen Energy

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Section: Resultssupporting

confidence: 87%

Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Wang

Liu

et al. 2015

International Journal of Hydrogen Energy

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“…Co 2+ species in all alloys could be due to CoO or Co(OH) 2 . Co(OH) 2 might be present on the surface of the alloys as alkalization of the electrolyte occurs at the cathode layer due to hydrogen evolution during electrodeposition . This could be substantiated from the core level O1s spectra.…”

Section: Discussionmentioning

confidence: 91%

“…In the same figure, XPS of Co2p of as‐deposited DC Co−W alloy plated at pH5 is also shown for comparison. Accordingly, in the as‐deposited sample, Co2p 3/2,1/2 peaks at 781.8 and 797.3 eV having spin‐orbit separation [ΔE B (2p 3/2 −2p 1/2 )] of 15.5 eV along with strong satellite peaks at 4.2 and 6.3 eV higher energy in relation to main peaks could be attributed to Co 2+ from highly ionic Co 2+ type of species present in this kind of alloy coatings . Envelop of Co2p 3/2,1/2 after successive sputtering is broader compared to as‐deposited sample indicating that Co is present in several oxidation states.…”

Section: Resultsmentioning

confidence: 99%

“…Figure shows deconvoluted W4f spectrum of as‐deposited DC alloy plated at pH8. Deconvoluted spectrum shows intense W4f 7/2,5/2 peaks at 36.2 and 38.3 eV corresponding to W 6+ state, whereas there is a signature of very weak broad hump in 29−34 eV binding energy region that comprises the components of metallic W as well as Na2p. Accordingly, W4f 7/2,5/2 peaks at 31.0 and 33.0 eV could be assigned to metallic W species only .…”

Section: Resultsmentioning

confidence: 99%

“…That yields an alkalization of the electrochemical double layer, what in general decreases the W content in the electrodeposited alloys …”

Section: Discussionmentioning

confidence: 99%

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Characterization and microhardness of Co−W coatings electrodeposited at different pH using gluconate bath: A comparative study

Bera

Seenivasan

Rajam

et al. 2013

Surface & Interface Analysis

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Electrodeposition of Co–W alloy coatings has been carried out with DC and PC using gluconate bath at different pH. These coatings are characterized for their structure, morphology and chemical composition by X‐ray diffraction, field emission scanning electron microscopy, differential scanning calorimetry and X‐ray photoelectron spectroscopy (XPS). Alloy coatings plated at pH8 are crystalline, whereas coatings electrodeposited at pH5 are nanocrystalline in nature. XPS studies have demonstrated that as‐deposited alloy plated at pH8 with DC contain only Co2+ and W6+ species, whereas that alloy plated at pH5 has significant amount of Co0 and W0 along with Co2+ and W6+ species. Again, Co2+ and W6+ are main species in all as‐deposited PC plated alloys in both pH. Co0 concentration increases upon successive sputtering of all alloy coatings. In contrast, mainly W6+ species is detected in the following layers of all alloys plated with PC. Alloys plated at pH5 show higher microhardness compared to their pH8 counterparts. Copyright © 2013 John Wiley & Sons, Ltd.

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Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

Seenivasan

Bera

2016

Surface & Interface Analysis

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Effects of addition of P to Co-W coatings from gluconate bath using direct current (DC) and pulse current (PC) methods have been investigated in this study. Co-W-P coatings with different P concentrations are prepared by varying hypophosphite concentration in the bath. Current efficiency of the Co-W-P electrodeposition is lower than that for Co-W coatings. Increase in NaH 2 PO 2 concentration increases the cobalt content significantly and decreases the tungsten content drastically. Co-W-P coatings display 'cauliflower-like' morphology and roughness of the coatings increases with increasing P content. As-deposited Co-W-P deposits are amorphous while heat treatment at different temperatures has rendered them crystalline with the precipitation of stable species like, Co 3 W, Co 2 P, etc. Unlike Co-W coatings, Co-W-P shows two-step crystallization in differential scanning calorimetry (DSC) and on heat treatment, which is similar to the behavior of Co-P electrodeposited from gluconate baths. Moreover, inclusion of phosphorous and heat treatment have led to significant increase in microhardness of the Co-W-P coatings. X-ray photoelectron spectroscopy (XPS) studies provide a detailed insight into the nature of Co, W and P species in as-deposited and sputtered coatings. Microhardness of the heat-treated coatings is higher than the as-deposited counterparts and is comparable with that of hard chromium.

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Electrocrystallization of magnetic Co–W–Mn films

Cited by 15 publications

References 9 publications

Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Hydrogen generation from alkaline NaBH 4 solution using electroless-deposited Co–W–P supported on γ-Al 2 O 3

Characterization and microhardness of Co−W coatings electrodeposited at different pH using gluconate bath: A comparative study

Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

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