期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 93, 期 8, 页码 2229-2235出版社
WILEY
DOI: 10.1111/j.1551-2916.2010.03726.x
关键词
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资金
- National Natural Science Foundation of China [50772020, 50972025]
- Program for New Century Excellent Talents in University [NCET-25-0290]
- Key Laboratory of Functional Crystals and Laser Technology, TIPC, CAS
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0713]
Gadolinium has been frequently used in scintillators to enhance the X-ray stopping power and in phosphors to improve the luminescent properties. In this paper, the fabrication of Gd3+-substituted transparent (Y1-xGdx)(3)Al5O12 (x=0.01, 0.5, 0.75, and 1) ceramics via solid reactive sintering has been investigated. The effects of Gd3+ substitution on the phase evolution of the powder mixture, sintering behavior of the powder compact, and properties of the resultant ceramics were mainly demonstrated. It is shown that Gd3+ substitution favors the formation of kinetically stable intermediate compounds, particularly REAlO3 (RE=Y+Gd), and thus retards the crystallization of an RE3Al5O12 garnet. The samples of x=1 composition cracked upon vacuum sintering at temperatures above 1600 degrees C, mainly due to the volumetric expansion induced by garnet formation. The transparent Y1.48Gd1.5Ce0.02Al5O12 ceramic (inline transmittance: similar to 65% at 800 nm) vacuum sintered at 1700 degrees C shows an emission band peaked at similar to 570 nm upon UV excitation at 340 nm, exhibiting a red-shift by similar to 40 nm in comparison with the regular emission from YAG:Ce.
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