不定比ペロブスカイト型化合物ErRh_3B_xの硬さ及び耐酸化性

概要

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Polycrystals of ErRh_3B_x are synthesized by are melting. The compounds of ErRh_3B_x have a perovskite-type cubic structure (space group: Pm3^^-m). The nonstoichiometric phase exists for the boron content from x=1.000 (20mol%B) to 0.61 (13.3 mol%B). The lattice parameter of α depends on x, and varies linearly from α=0.4151 nm (x=1.000) to 0.4063 nm (x=0.61). The micro-Vickers hardness of the ErRh_3B_x compaunds increases with increasing their B content. The hardness of ErRh_3B_<1.000> (20 mol% B) sample is 8.6±0.3 GPa. The thermo gravimetric curve indicates that the onset-temperature of oxidation for ErRh_3B_<1.000> is 1303 K. The weight gain of ErRh_3B_<1.000> during heating in air to 1473 K is 0.7%.
社団法人日本セラミックス協会の論文
2000-11-01