ホランダイト型K_xNb_yTi_<8-y>O_<16>(x≤1.15, 0≤y≤1)の合成と結晶構造解析

概要

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Hollandite-type compounds, K_xNb_yTi_<8-y>O_<16>(x≤1.15, 0≤y≤1) were prepared by high temperature reaction under H_2 atmosphere. Black single crystals of Holladite-type K_<1.15>Nb_<0.67>Ti_<7.33>O_<16> were obtained by heating a mixture of K_2CO_3, TiO_2 and Nb_2O_5 with the molar ratio of 1 : 1 : 1 under H_2 atmosphere at 1200℃ for 1 h. From single crystal X-ray diffraction analysis, the tetragonal lattice parameters of this compound are α = 1.02260(7) and c = 0.2974(1) nm, and the cystal structure refinement led to the final R-factors of R = 0.037 and R_w = 0.041 for 773 unique diffractions. The extent of solubility of niobium for powder samples was found to be y≤1 in K_xTi_<8-y>Nb_yO_<16> from solid state reaction under H_2 atmosphere at 1200℃ and the value of x ranged from 0.8 to 0.9.
社団法人日本セラミックス協会の論文
2003-05-01