The present study aimed to realize magnetic coatings of SmCo alloy starting from a deep eutectic solvent by means of electrodeposition. Deep eutectic solvent used was a mixture of choline chloride and ethylene glycol with two different molar ratios, 1:2 and 1:4.5. Cyclic voltammetries are performed on both the solutions with the auxilium of a galvanostat/potentiostat (AMEL 2550). To improve deposition rate of the bath and Sm wt.% in the film, glycine it’s added to both solutions, a complexing agent that helps in these purposes. Depositions were performed in a simple three electrode electrochemical cell at constant potentials to produce film with different composition and so properties. Characterization of the obtained film was performed starting from X-ray fluorescence (XRF) for composition and thickness analysis, X-ray diffraction (XRD) for an analysis of crystalline structure. Samples with the composition corresponding to SmCo5 and Sm2Co17 phases are obtained but no evidence of the formation of such phases is observed. To characterize surface morphologically and topographically the surface of the film, scanning electron microscope (SEM) images were collected together with energy dispersive spectroscopy (EDS). Through these analyses, it has been possible to identify different growth between sample with and without glycine. To obtain a depth profile of the samples, with an elemental analysis, GDOES data were obtained too. It’s possible to notice oxide presence in the deposited film that can be limited with clothing of the anode and using dried choline chloride. Films were also characterized magnetically using a vibrating sample magnetometer (VSM).
Il presente studio si pone come scopo quello di realizzare rivestimenti magnetici di SmCo utilizzando deep eutectic solvents. Il Deep eutectic solvent utilizzato è una miscela di cloruro di coline e glicole etilenico con due diversi rapporti molari 1:2 e 1:4.5. sono stati eseguiti studi preliminari sul comportamento del bagno allo scopo di caratterizzarlo e ottimizzarlo. Voltammetrie cicliche sono state eseguite su entrambe le soluzioni con l’utilizzo di un potenziostato/galvanostato (AMEL 2550). Per migliorare il tasso di deposizione e la percentuale di samario presente nel film, è stata aggiunta, a entrambe le soluzioni, la glicina, un agente complessante utilizzato in soluzioni acquose per aiutare nel raggiungimento delle caratteristiche desiderate. Le deposizioni sono state effettuate utilizzando una cella a tre elettrodi e a potenziale costante per produrre rivestimenti con diverse composizioni e, quindi, proprietà. La caratterizzazione dei film ottenuti è stata svolta inizialmente per mezzo di fluorescenza a raggi-x (XRF), per la composizione e l’analisi dello spessore, diffrazione di raggi-x (XRD), per un’analisi della struttura cristallina. Sono stati ottenuti campioni con composizione corrispondente alle leghe SmCo5 and Sm2Co17. Per caratterizzare morfologicamente e topograficamente la superficie del campione è stato utilizzato un microscopio a scansione elettronica (SEM) insieme a analisi dell’EDS. Grazie a queste analisi è stato possibile identificare due diversi tipi di crescita tra i campioni con e senza glicina. Per ottenere un profilo di profondità i campioni sono stati sottoposti alla macchina GDOES. È stato possibile notare la presenza di ossigeno e ossidi nel deposito. I film sono infine stati caratterizzati magneticamente per mezzo di VSM.
Electrodeposition of magnetic SmCo film from non-aqueous solutions
TRESOLDI, MATTEO
2016/2017
Abstract
The present study aimed to realize magnetic coatings of SmCo alloy starting from a deep eutectic solvent by means of electrodeposition. Deep eutectic solvent used was a mixture of choline chloride and ethylene glycol with two different molar ratios, 1:2 and 1:4.5. Cyclic voltammetries are performed on both the solutions with the auxilium of a galvanostat/potentiostat (AMEL 2550). To improve deposition rate of the bath and Sm wt.% in the film, glycine it’s added to both solutions, a complexing agent that helps in these purposes. Depositions were performed in a simple three electrode electrochemical cell at constant potentials to produce film with different composition and so properties. Characterization of the obtained film was performed starting from X-ray fluorescence (XRF) for composition and thickness analysis, X-ray diffraction (XRD) for an analysis of crystalline structure. Samples with the composition corresponding to SmCo5 and Sm2Co17 phases are obtained but no evidence of the formation of such phases is observed. To characterize surface morphologically and topographically the surface of the film, scanning electron microscope (SEM) images were collected together with energy dispersive spectroscopy (EDS). Through these analyses, it has been possible to identify different growth between sample with and without glycine. To obtain a depth profile of the samples, with an elemental analysis, GDOES data were obtained too. It’s possible to notice oxide presence in the deposited film that can be limited with clothing of the anode and using dried choline chloride. Films were also characterized magnetically using a vibrating sample magnetometer (VSM).| File | Dimensione | Formato | |
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https://hdl.handle.net/10589/133490