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Effects of Gd 3+ Substitution on the Fabrication of Transparent (Y 1−x Gd x ) 3 Al 5 O 12 Ceramics
Author(s) -
Li Xiaodong,
Li JiGuang,
Xiu Zhimeng,
Huo Di,
Sun Xudong
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03726.x
Subject(s) - materials science , sintering , fabrication , luminescence , ceramic , phosphor , analytical chemistry (journal) , transparent ceramics , crystallization , gadolinium , crystallography , mineralogy , metallurgy , chemical engineering , chemistry , optoelectronics , medicine , alternative medicine , pathology , chromatography , engineering
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 Gd 3+ ‐substituted transparent (Y 1− x Gd x ) 3 Al 5 O 12 ( x =0.01, 0.5, 0.75, and 1) ceramics via solid reactive sintering has been investigated. The effects of Gd 3+ 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 Gd 3+ substitution favors the formation of kinetically stable intermediate compounds, particularly REAlO 3 (RE=Y+Gd), and thus retards the crystallization of an RE 3 Al 5 O 12 garnet. The samples of x =1 composition cracked upon vacuum sintering at temperatures above 1600°C, mainly due to the volumetric expansion induced by garnet formation. The transparent Y 1.48 Gd 1.5 Ce 0.02 Al 5 O 12 ceramic (inline transmittance: ∼65% at 800 nm) vacuum sintered at 1700°C shows an emission band peaked at ∼570 nm upon UV excitation at 340 nm, exhibiting a red‐shift by ∼40 nm in comparison with the regular emission from YAG:Ce.