Pb_5Nb_<10>O_<30>セラミックスへのLa置換による相転移と焼結挙動

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The phase transformation and densification behavior of (Pb^<2+>_<1-X>La^<3+>_<2X/3>)_5Nb_<10>_O<30> (X=0.00-0.20) tungsten bronze (TB)-type compounds were studied with respect to La^<3+> ion substitution for Pb^<2+> ion in Pb_5Nb_<10>O_<30>. Analysis of the phase identification shows that the phase transformation temperature (low temperature rhombohedral form ⟷ high temperature tetragonal form) decreases along with the increase of La^<3+> amount. The decrease of phase transformation temperature limits excessive grain growth, which usually occurs from the co-proceeding of phase transformation and sintering in Pb_5Nb_<10>O_<30> and, as a result, the density after sintering is effectively improved. Furthermore, two different densification models for Pb_5Nb_<10>O_<30> and (Pb^<2+>_<1-X>La^<3+>_<2X/3>)_5Nb_<10>_O<30> were described and discussed.
社団法人日本セラミックス協会の論文
2001-02-01