Loading…

Impact of the pulling rate on the redox state and magnetic domains of Fe-Si-O glass ceramic processed by LFZ method

[Display omitted] •The Fe-Si-O glass-ceramics were prepared by Laser Floating Zone (LFZ) technique.•The influence of pulling rate variation on the crystallization kinetics and the redox state is investigated.•Faster growth favors the formation of Fe-containing clusters with a higher Fe2+/Fetotal rat...

Full description

Saved in:
Bibliographic Details
Published in:Materials research bulletin 2020-11, Vol.131, p.110972, Article 110972
Main Authors: Salehizadeh, S.A., Ferreira, N.M., Ivanov, M.S., Khomchenko, V.A., Paixão, J.A., Costa, F.M., Valente, M.A., Graça, M.P.F.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •The Fe-Si-O glass-ceramics were prepared by Laser Floating Zone (LFZ) technique.•The influence of pulling rate variation on the crystallization kinetics and the redox state is investigated.•Faster growth favors the formation of Fe-containing clusters with a higher Fe2+/Fetotal ratio.•VSM measurement and AFM/MFM analysis´s results supported the findings obtained from Raman's study. This work studies the effect of the pulling rate, varying from 100 to 400 mm/h, on the redox state, structure and magnetic properties of iron oxide bearing silica glasses processed by laser floating zone (LFZ) method. XRD analysis revealed that the maximum crystallinity is obtained in the fibre grown at the lowest pulling rate. A detailed Raman analysis demonstrated that the global content of Fe2+ increases with pulling rate, while the growth under a lower pulling rate promotes the α-Fe2O3 crystallization. Atomic/magnetic force microscopy provided further evidence of phase-separated iron oxide crystallites formation with a high Fe2+/Ftotal ratio as the pulling rate increases. The magnetic measurements performed over a wide temperature range showed that the highest magnetization is found in the fibre grown at the highest pulling rate. A strong correlation between structural-topographical features and the magnetic characteristics of the glass fibres is substantiated.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2020.110972