Detailed investigation of structural and magnetic properties of multiphase binary Pd-Co alloys prepared by modified polyol process

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dc.authoridEkicibil, Ahmet/0000-0003-3071-0444
dc.authoridKaradag, Faruk/0000-0001-7862-9085
dc.authoridKaya, Dogan/0000-0002-6313-7501
dc.authoridAkyol, Mustafa/0000-0001-8584-0620
dc.contributor.authorKaya, Dogan
dc.contributor.authorAdanur, Idris
dc.contributor.authorAkyol, Mustafa
dc.contributor.authorKaradag, Faruk
dc.contributor.authorEkicibil, Ahmet
dc.date.accessioned2025-01-06T17:43:53Z
dc.date.available2025-01-06T17:43:53Z
dc.date.issued2021
dc.description.abstractPd-Co based magnetic alloy nanoparticles were prepared by the modified polyol process and stabilized by polyvinylpyrrolidone (PVP) and 3-aminopropyl-trimethoxysilane (APES) capping agents and further reduction of metal salts with Sodium borohydride (NaBH4) at high temperature to form desired NPs. We have a detailed investigation of the effect of Pd concentration in the Pd-Co alloy NPs on structural and magnetic properties. XRD and Rietveld refinement analyses were confirmed that the multiphase structures of fcc-PdCo, fcc-Co, and hcp-Co phases coexist at low Pd loading samples. Over %50 of Pd loading resulted in a single fcc-PdCo phase with reduced lattice parameter to 4.0079 angstrom and d((111))-space to 2.31 angstrom. TEM and SEM images reveal well dispersed and uniformly distributed NPs with an average particle sizes of below 7 nm. The elemental compositions and the characteristic OH, CH, CO stretching peaks of capping agents were confirmed by EDS and FT-IR spectrums, respectively. M(T) and M(H) curves revealed that there are multi magnetic phase transitions in the Pd-Co structure as a function of Pd loading from superparamagnetic to ferromagnetic phase or back to superparamagnetic phase by reducing the temperature from 300 K to 5 K. We observed that the blocking temperature (T-B) could not be detected due to 5% Pd loading below 300 K, while it reduced up to 55 K at high Pd loading of 62%. The coercive field (H-c) was increased to similar to 1900 Oe for Pd0.62Co0.38 sample due to the smallest particle size as 5.26 nm. The highest amount of Co resulted in maximum saturation magnetization (M-s) up to 65.5 emu/g for 5% Pd concentration. We measured the M-r/M-s ratios were less than 0.5, which is due to the internal stress that results in the uniaxial magnetic anisotropy in the structure. The maximum K-eff and mu(f.u). values were found to be over 12.9 x 10(6) erg/cm(3) and 0.72 mu(B) at 5 K for 5% Pd concentration, respectively. (C) 2021 Elsevier B.V. All rights reserved.
dc.description.sponsorshipCukurova University, Adana, Turkey [FBA2019-12018]
dc.description.sponsorshipThis research work was funded by Cukurova University, Adana, Turkey, under Scientific Research Funding Grand No: FBA2019-12018. D.K would like to thank Halil Esgin at Cukurova University Central Research Laboratory for valuable discussion.
dc.identifier.doi10.1016/j.jallcom.2021.160157
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85105317903
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2021.160157
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2849
dc.identifier.volume876
dc.identifier.wosWOS:000660355700001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Sa
dc.relation.ispartofJournal of Alloys and Compounds
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectPd-Co nanoparticles
dc.subjectMulti magnetic phases
dc.subjectModified polyol process
dc.titleDetailed investigation of structural and magnetic properties of multiphase binary Pd-Co alloys prepared by modified polyol process
dc.typeArticle

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