Nengli Wang, Xi-yan Zhang, Z. Bai
Nov 25, 2010
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Journal
Powder Technology
Abstract
Abstract Ytterbium-doped yttria (Yb 3+ :Y 2 O 3 ) nanopowders for transparent ceramics were synthesized by using a carbonate-precipitation method. The characteristics of precursor and powders calcined at different temperatures were investigated. The pure yttria phase can form through calcining at 700 °C. The Yb 3+ :Y 2 O 3 nanopowders calcined at 1100 °C were well dispersed with a spherical morphology, and had a narrow particle size distribution with a mean particle size of about 70 nm. By using 1100 °C-calcined powders, nearly full dense Yb 3+ :Y 2 O 3 ceramics were fabricated at 1750 °C for 8 h without any additives under vacuum conditions. The fluorescence spectrum of the sintered ceramics illustrates that there are two emission peaks locating at 1028 and 1071 nm respectively, all corresponding to the 2 F 5/2 → 2 F 7/2 transitions of Yb 3+ ion. Homogeneous Yb 3+ :Y 2 O 3 nanopowders synthesized by carbonate-precipitation method are suitable for the fabrication of IR-transparent ceramics.