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- Title
Barium ferrite prepared by modified Pechini method: effects of chloride and nitrate counter ions on microstructures and magnetic properties.
- Authors
Wattanathana, Worawat; Nantharak, Worawut; Wannapaiboon, Suttipong; Jantaratana, Pongsakorn; Veranitisagul, Chatchai; Koonsaeng, Nattamon; Laobuthee, Apirat
- Abstract
Barium hexaferrite powders were successfully prepared by the modified Pechini method using citrate and glycerol. The materials were prepared employing different Ba:Fe ratios, iron(III) precursors and calcination temperatures. The obtained powders were characterized by XRD, VSM, SEM, EDX and FT-IR. The Ba:Fe molar ratio of 1:11, for both chloride and nitrate series, is observed to be the optimal ratio to attain the phase-pure barium hexaferrite. Moreover, these barium hexaferrite powders synthesized with the Ba:Fe ratio of 1:11 showed the highest saturation magnetization among the samples in the same series. Interestingly, the powders formed from chloride precursors had significantly lower coercive fields than those from nitrate precursors, highlighting the role of counter ions. The reasons were likely to be the smaller particle sizes in materials obtained from the nitrate precursors and possibly the distortion of the barium hexaferrite structure due to the substitution of some oxide with the chloride species within the materials obtained in the chloride series.
- Subjects
BARIUM ferrite; LIQUID mixtures; CHLORIDE ions; NITRATES; MICROSTRUCTURE; MAGNETIC properties
- Publication
Journal of Materials Science: Materials in Electronics, 2018, Vol 29, Issue 2, p1542
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-017-8064-2