Rus, E.
, De Lima Correa, E.
, Dennis, C.
and Moffat, T.
(2024),
Influence of Potential and the Presence of Boric Acid on Pt1-xCox Alloy Electrodeposition and Magnetic Properties, Journal of the Electrochemical Society, [online], https://doi.org/10.1149/1945-7111/ad6b48, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957292
(Accessed November 21, 2024)
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Influence of Potential and the Presence of Boric Acid on Pt1-xCox Alloy Electrodeposition and Magnetic Properties
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Abstract
The effects of potential and the presence of B(OH)3 on the electrodeposition of Pt1-xCox alloys from aqueous chloride-based solutions have been investigated, and the properties of the resulting films characterized. Films deposited at potentials <-0.65 V vs SCE had >90 atomic % Co and were hexagonal close packed. Those deposited at >-0.65 V showed a monotonic decrease in cobalt content with increasing potential and were face centered cubic. The structural change coincided with a distinct cusp in the composition potential relationship, and with a prominent voltametric feature, possibly relating to nucleation of the hcp phase. The presence of B(OH)3 produced a sharp minimum in both Coulombic efficiency and deposition rate at potentials near -0.65 V and almost entirely suppressed the voltametric feature. The presence of B(OH)3 did not strongly affect the magnetic behavior of films deposited at >-0.55 V (i.e., those with compositions less than about 40% cobalt), but resulted in generally lower maximum magnetizations for films deposited at more reducing potentials, and a much lower magnetization for films deposited at -0.65 V. Pt1-xCox films (x=0.2) deposited at -0.35 V had Curie temperatures (TC) in the room temperature range.Citation
Journal of the Electrochemical Society
Volume
171
Pub Type
Journals
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Keywords
platinum cobalt, induced co-deposition, magnetic thermosensitivity, Curie temperature
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Created August 26, 2024, Updated September 9, 2024