Y_2O_3-Nb_2O_5系複合セラミックスの粒界導電率

概要

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rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110002291766/By measuring ion conductivity of the specimens using the complex impedance method at 400°-900℃ in the air, a study has been made with the sintered bodies, which were prepared from (YO_<1.5>)_<1->(NbO_<2.5>)_x (x=0.05-0.35) powders obtained by the solid phase reaction. In case of x=0.15 composition samples, the total and grain boundary conductivity reached the highest values. On the other hand, the grain conductivity was nearly constant at x=0.15-0.35 composition samples. From the relationship between the crystal phase and the conductivity of the above stated composition samples, it is suggested that the high conductivity of the x=0.15 composition samples is very susceptible to the precipitation of Y_2O_3 whose conductivity is lower than that of Y_3NbO_7. Thus, the conductivity of Y_3NbO_7-Y_3Al_5O_<12> and Y_3NbO_7-MgO sintered bodies, which were prepared by the addition of Al_2O_3 and MgO, lower conductivity materials, to Y_3NbO_7, was measured. Their grain boundary conductivities took a figure up one place in the maximum. It was proved that the grain boundary conductivity enhances by the addition of lower conductors to the basic materials.
社団法人日本セラミックス協会の論文
1992-07-01