Growth and Microstructure of Ordered Eutectics GdAlO3:Tb3+-Al2O3

Abstract

Abstract: Binary ordered eutectic materials which have two separated crystallographic phases with different refractive index can reduce light scattering and possess light guiding properties, which may be used in high spatial resolution imaging detectors. In this work, the ordered eutectics GdAlO₃:Tb³⁺-Al₂O₃ with a diameter of 3 mm were grown by micro-pulling-down method according to directionally solidified principle. The internal structure of obtained eutectics was determined by SEM and elemental analysis. It was found that the GdAlO₃:Tb³⁺ crystal fibers were well aligned in the matrix Al₂O₃ crystallographic phase and the diameter of GdAlO₃:Tb³⁺ crystal fibers can be adjusted by pulling-down speed during crystal growth process. The faster the pulling-down speed is, the smaller the crystal fiber becomes. At the same time, the radioluminescence properties of GdAlO₃:Tb³⁺-Al₂O₃ eutectic samples were determined. The GdAlO₃:Tb³⁺ crystal fibers can convert X-rays to green lights and the emitted green lights are transported along the fiber direction by total reflection mode, which can overcome resolution reduction caused by light scattering and have potential application for X-ray detection.

Key words: ordered eutectic, directional solidification, micro-pulling-down method, radioluminescence, GdAlO₃:Tb³⁺

CLC Number:

O782
TB34

LIU Fang, LIU Zhen, ZHONG Xingyuan, ZHONG Jiuping. Growth and Microstructure of Ordered Eutectics GdAlO₃:Tb³⁺-Al₂O₃[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(10): 1971-1978.

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Growth and Microstructure of Ordered Eutectics GdAlO₃:Tb³⁺-Al₂O₃

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