高温度銅融液から合成したPrRh_<4.8>B_2単結晶の育成, 電気抵抗率, 硬さ及び熱的性質

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PrRh_<4.8>B_2 single crystals were prepared from high temperature copper solutions by slow cooling method, using praseodymium tips, rhodium powders and boron powders as starting materials under helium flow. PrRh_<4.8>B_2 belongs to the orthorhombic system with the space group Fmmm ; a=0.9697(4)nm, b=0.5577(2)nm and c=2.564(3)nm. Vickers microhardness and electrical resistivity of the compound were measured, and oxidation resistivity of the compound at high temperature in air was studied. Vickers microhardness(Hv)and the electrical resistivity(ρ)value on(001)plane with the orthorhombic system of PrRh_<4.8>B_2 were in the range of Hv=6.12-7.32GPa and ρ=670×10^<-6>Ω・cm, respectively. The oxidation in air of PrRh_<4.8>B_2 crystals began to proceed at about 590°C. Weight gain of the sample heated up to 1200°C in air is 13% and the identified oxidation product consisted of the PrBO_3(orthorhombic)and Rh(cubic)
社団法人日本セラミックス協会の論文
1999-02-01