| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1792216 | Journal of Crystal Growth | 2011 | 6 Pages |
The crystallization of bismuth substituted yttrium iron garnet (Bi-YIG) powder and thin film prepared by the metal-organic decomposition method (MOD) have been studied. In the powder analysis, it was observed that the pyrolysis of metal-organic compounds begins at 250 °C and completed at 450 °C from the thermo-gravimetric-differential thermal analysis experiment. The crystallization temperature of Bi-YIG powder was 900 °C, and at lower temperature, secondary YFeO3, γ-Fe2O3, α-Fe2O3, and BiFeO3 phases were observed by X-ray diffraction and Fourier transform infrared spectroscope. This crystallization temperature is higher than other chemical solution decomposition methods, so we suggest that the formation of BiFeO3 in the MOD method increases the crystallization temperature. In the thin film analysis, the crystallization temperature for Bi-YIG is 750 °C, and at lower temperature, secondary phases are observed by X-ray diffraction. It is observed that high pre-annealing temperature promotes the crystallization of secondary phases. From the magneto-optical measurement, it was observed that the secondary phases strongly degrade the magneto-optical properties of the Bi-YIG thin film.
► The crystallization process of the Bi-YIG powder and thin film were investigated. ► The crystallization temperature of Bi-YIG powder was 900 °C. ► The formation of BiFeO3 in the MOD method increased the crystallization temperature. ► The crystallization temperature for Bi-YIG thin film was 750 °C. ► The high pre-annealing temperature promoted the formation of secondary phases.
