Formation of Solid Solutions of New Tungsten Bronze-Type Microwave Dielectric Compounds Ba_<6-3x>R_<8+2x>Ti_<18>O_<54> (R=Nd and Sm, 0≤r≤1)

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The formation of solid solutions of microwave dielectric compounds having compositions in the vicinity of Ba_<3.75^->R_<9.5>Ti_<18>O_<54> and/or BaO・R_2O_3・4TiO_2 (R=rare earth) has been investigated. 3BaO・2R_2O_3・9TiO_2 (Ba_6R_8Ti_<18>O_<54>) solid solutions with the ideal formulae of Ba_<6-3x>R_<8+2x>Ti_<18>O_<54> (0.0≤x≤1.0) have been derived on the tie line with the ratio Ti:O=1:3 between perovskite and R_2Ti_3O_9 based on the new tungsten bronze-type crystal structure with 2×2 perovskitelike unit cells. The type of solid solutions is substitutional with following the relation 3Ba^<2+>⇄2 R^3+□. Lattice parameters as a function of composition have been determined by the WPPD (whole-powder-pattern decomposition) method. The formation range is located at 0.3≤r≤0.7 compositions in the case of R=Sm and 0.0≤r≤0.7 in R=Nd. In the latter case two kinds of substitutions of the solid solutions are considered.
社団法人応用物理学会の論文
1993-09-30