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Journal of Inorganic Materials

Journal of Inorganic Materials >

2006 , Vol. 21 >Issue 3: 539 - 546

DOI: https://doi.org/10.3724/SP.J.1077.2006.00539

Research Paper

Solution-based Processing of Y2O3 Nanopowders Yielding Transparent Ceramics

  • WEN Lei ,
  • SUN Xu-Dong ,
  • QI Lu ,
  • XU Guo-Xiang
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  • 1. New Energy Materials and Technology Laboratory, Department of Applied
    Chemistry, Peking University, Beijing 100871, China;
    2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

Received date: 2005-05-27

  Revised date: 2005-08-08

  Online published: 2006-05-20

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Abstract

Nanocrystalline yttria powders were synthesized from Y(NO3)3 solution and ammonia water by a precipitation method. The chemical composition of the hydroxide precursor was Y2(OH)5NO3·H2O. The effects of pH values and striking process on the properties of hydroxide precursor and resultant yttria powders were studied. At low pH conditions (pH=7.9) of the normal striking method, the
precipitation precursor has a layered structure. If the final pH value is comparatively high (pH=10.0), the layered nature of the precipitation precursor decreases, and the crystallites are more fine. By using reverse-strike technique, the layered nature of the flocs disappears, and it is mainly composed of more equiaxed crystallites. More sinterable yttria powders can be synthesized by
calcining the hydroxide precursor with platelet-shaped structure. A small amount of ammonium sulfate doping can reduce the agglomeration of the resultant yttria powders. Resultant Y2O3 powders synthesized at a low pH (below 9) show much better sinterability than those from higher pH value derived precursor. By using the nanocrystalline yttria powder, transparent yttria ceramics were produced by vacuum sintering at 1700℃ for 4h without any additives.

Key words： Y2O3; transparent ceramics; optical properties; nanopowders

Cite this article

WEN Lei , SUN Xu-Dong , QI Lu , XU Guo-Xiang . Solution-based Processing of Y2O3 Nanopowders Yielding Transparent Ceramics[J]. Journal of Inorganic Materials, 2006 , 21(3) : 539 -546 . DOI: 10.3724/SP.J.1077.2006.00539

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