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Densification of rare-earth (Lu, Gd, Nd)-doped alumina nanopowders obtained by a sol-gel route under seeding
Odaka, Atsushi
Yamaguchi, Tomohiro
Fujita, Takayuki
Taruta, Seiichi
Kitajima, Kunio
Copyright© 2009 Elsevier B.V. All rights reserved.
Alumina
Nanopowders
Sol-gel
Lu-doping
Densification
Grain size
Rare-earth (RE: Lu, Gd, Nd, 0.10 mol%)-doped alumina nanopowders were prepared by a new sol-gel route using polyhydroxoaluminum (PHA) and RECl(3) Solutions under alpha-alumina (similar to 75 nm) seeding. Among the rare-earth dopants studied, Lu yields the most suitable nanopowders for low-temperature densification. The 0.10 mol% Lu-doped nanopowders, which were obtained at a calcination temperature of 900 degrees C under 5 mass % alpha-alumina seeding, consisted of similar to 80-nm alpha-alumina particles and gamma-alumina nanoparticles. Using these Lu-doped alumina nanopowders, fully densified alumina ceramics with a uniform microstructure composed of fine grains with an average size of 0.61 mu m could be obtained at 1400 degrees C by pressureless sintering. Clearly, the Lu-doped nanopowders obtained here represent a viable option for fabricating dense, finer-grained alumina ceramics because an undoped sample with 5 mass% seeds gave a microstructure with an average grain size of 1.78 mu m at 1400 degrees C. (C) 2009 Elsevier B.V. All rights reserved.
Article
POWDER TECHNOLOGY. 193(1):26-31 (2009)
ELSEVIER SCIENCE SA
2009-07-10
eng
journal article
AM
http://hdl.handle.net/10091/13656
https://soar-ir.repo.nii.ac.jp/records/12450
https://doi.org/10.1016/j.powtec.2009.02.003
10.1016/j.powtec.2009.02.003
0032-5910
AA00778424
POWDER TECHNOLOGY
193
1
26
31
https://soar-ir.repo.nii.ac.jp/record/12450/files/Densification_rare-earth_Lu_Gd_Nd-doped_alumina_nanopowders.pdf
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