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- Title
Gadolinium Aluminate Garnet ( Gd<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>): Crystal Structure Stabilization via Lutetium Doping and Properties of the ( Gd<sub>1− x</sub> Lu<sub> x</sub>)<sub>3</sub> Al<sub>5</sub>O<sub>12</sub> Solid Solutions ( x = 0-0.5)
- Authors
Li, Jinkai; Li, Ji-Guang; Zhang, Zhongjie; Wu, Xiaoli; Liu, Shaohong; Li, Xiaodong; Sun, Xudong; Sakka, Yoshio; Hay, R.
- Abstract
To suppress the thermal decomposition and stabilize the crystal structure of Gd3Al5O12 ( GdAG) garnet, GdAG was doped with significantly smaller Lu3+ to form (Gd,Lu)AG solid solutions. The precursors for ( Gd1− x Lu x)3 AG ( x = 0-0.5), with a general formula of ( NH4) x Ln3Al5(OH) y( CO3) z· n H2O ( Ln = Gd and Lu), were synthesized via carbonate co-precipitation from the mixed solutions of aluminum, lutetium, and gadolinium nitrates using ammonium hydrogen carbonate as the precipitant. The results showed that 10 at.% of Lu3+ ( x = 0.1) has been able to stabilize GdAG against its thermal decomposition to a mixture of GdAlO3 ( GdAP) and Al2O3 phases at temperatures above 1300°C and that Lu3+ doping effectively lowers the temperature for garnet crystallization. The precursors of x ≥ 0.3 convert to pure LnAG at a low temperature of ~1000°C via the intermediates of Ln4Al2O9 ( LnAM) and LnAP. The carbonate precursors are loosely agglomerated and the resultant LnAG powders show good dispersion and a fairly uniform particle morphology. The (Gd,Lu)AG solid solutions exhibit decreasing lattice parameters and increasing optical bandgaps along with more Lu3+ incorporation.
- Subjects
CHEMICAL decomposition; GADOLINIUM aluminate; GARNET crystallography; CRYSTAL structure research; SOLID solutions; DOPING agents (Chemistry); LUTETIUM
- Publication
Journal of the American Ceramic Society, 2012, Vol 95, Issue 3, p931
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2011.04991.x