Phase Evolution of Yttrium Iron Garnet (YIG) Made by Solid State Sintering: Particle Size Effect

Abstract:

The phase evolution of yttrium iron garnet (YIG) during reaction 3Y₂O₃-5Fe₂O₃ was investigated by modifying Fe₂O₃ particle sizes (FPS). Five different sizes of Fe₂O₃, (d₅₀) are used to prepare YIG powder. Solid state reaction (SSR) was applied at 1200 °C in order to gain insight on the effect of FPS towards the YIG formation. Rietveld refinement method was used to quantify the amount of YIG yielded (%). Larger FPS (> 50 μm) initiates only 5Fe₂O₃ + 3Y₂O₃ à 3YFeO₃ + Fe₂O₃ + Y₃Fe₅O_12.. However, when the fine FPS (5 μm) is used, the reaction pathway was changed into 5Fe₂O₃ + 3Y₂O₃ à 6YFeO₃ + 2Fe₂O₃ à 2Y₃Fe₅O_12. These behaviors is explained that the smaller FPS consumed quickly to form YIG due to the smaller particle distance between Fe₂O₃ and Y₂O₃. This shall be leading to higher reaction rates (mass-transfer kinetics).

• Periodical: Materials Science Forum (Volume 840)
• Pages: 276-280
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.840.276
• Online since: January 2016
• Authors: Wan Fahmin Faiz Wan Ali*, Norazharuddin Shah Abdullah, Mohd Fadzil Ain, Zainal Arifin Ahmad
• Keywords: Fe₂O₃, Particle Size Effect, Solid State Sintering, Y₂O₃, YIG

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