不定比ペロブスカイト型化合物YRh_3B_x, YRh_3C_x及びYRh_3B_xC_<1-x>のB又はC量xの変化に伴う格子定数の変化

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Polycrystalline samples of YRh_3B_x, YRh_3C_x and YRh_3B_xC_<1-x> have been synthesized by arc melting method to clarify the relationship between the lattice parameter and boron or carbon content. All the obtained perovskite-type compounds have cubic structure (space group : Pm3m, Z=1). Perovskite-type YRh_3B_x exists in the range 0.444≤x≤1.0. Lattice parameter a in YRh_3B_x depends on x, and varies from 0.40944(6)nm(x=0.444) to 0.41675(5)nm (x=1.0). Perovskite-type YRh_3C_x also exists in the above range of x. Its lattice parameter α varies from 0.40855(5)nm (x=0.444) to 0.41262(4)nm (x=1.0). The packing mode of the boron and carbon in the host lattice of YRh_3 are very similar ; the value of the lattice parameter α increases with increasing the amount of interstitial atoms of boron or carbon, x. In the case of solid solution perovskite-type YRh_3B_xC_<1-x> lattice parameter α also depends on x, with being 0.41428(6)nm (x=0.25), 0.41462(5)nm (x=0.5) and 0.41506(5)nm (x=0.75) ; the α vs. the x does not follow the linear function.
社団法人日本セラミックス協会の論文
1999-07-01