Low temperature sintering of polycrystalline yttria by transition metal ion doping
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概要
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Sintering of (1 mol%Ni2+-1 mol%Er3+) or (1 mol%Mn2+-1 mol%Er3+) -doped Y2O3 polycrystal was investigated by conventional sintering at the sintering temperature in a range from 1200 to 1600°C. The sintering temperature required for full-densification decreased from 1600 to 1300°C by the doping. The average grain size in Ni2+ or Mn2+-doped Y2O3 is twice as large as that in undoped Y2O3 at the examined sintering temperature. HRTEM observations and EDS analyses with a nano-sized probe indicated that the doped transition metal ions segregated along the grain boundaries without amorphous layers and secondary phase particles. The segregated transition metal ions probably enhance the grain boundary diffusion, and the sinterability of Y2O3 was accordingly improved.
- 2009-06-01
著者
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YOSHIDA Hidehiro
National Institute for Materials Science
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YOSHIDA Hidehiro
Nano Ceramics Center, National Institute for Materials Science
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Yamamoto Takahisa
Department Of Advance Materials Science School Of Frontier Sciences The University Of Tokyo
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Yamamoto Takahisa
Dep. Of Advanced Materials Sci. The Univ. Of Tokyo
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Soga Kohei
Department Of Materials Science And Technology Tokyo University Of Science
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Yoshida Hidehiro
Nano Ceramics Center National Institute For Materials Science
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KODO Masayasu
Department of Materials Science and Technology, Tokyo University of Science
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Kodo Masayasu
Department Of Materials Science And Technology Tokyo University Of Science
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